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Do new valves need grinding? - Pelican Parts Forums

Jun 02, 2005  Lapping or grinding of new valves is NOT recommended anymore. Check with your supplier to be sure. They sometimes come with special coatings that are ruined by grinding or lapping. Grinding new valves is not recommended because the factory equipment is so much better than any machine shop grinders that the concentricity cannot be maintained.

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How to grind the valves on your engine - The Do It ...

If you use brand new valves, you will still need to grind the valves and seats to ensure a proper seat. The rockers will need to be adjusted anyway. Clean the engine head and valves thoroughly. You do not want to have any grinding paste left on the engine head.

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do you need to grind new heads and valves

I bought a new head and valves. Do I need to lap the. 2015-12-29 Mike, if the valves and seats are in spec, they should not need lapping. That is what my machinist told me. Your machine shop should glass bead blast your head and cut new seats. You will be happy with that. I don't know why people on this site do not approve of grinding valves.

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Removing and grinding valves How a Car Works

Generally valves should be ground, or 'lapped', into their respective seats to ensure a gas-tight seal. Grind-in each valve (including new valves) by hand, using a valve-grinding tool and valve-grinding paste. Attach the sucker on the grinding tool to the valve face.

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I bought a new head and valves. Do I need to lap the ...

Dec 29, 2015  At the factory, the valve core has the valve face and stem end built up wits Stelite material and then it is ground down to the final demension. The Factory Shop Manual says not to grind the valves to a thickness of less than.5mm. Call a Honda Shop and find out who does their machine work. That will be a good place to start.

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Valve Seat Lapping - Is it Necessary for New Valves and ...

Apr 10, 2018  I just had new valve seats professionally installed by a machine shop and I have a new set of valves ready to go in. Is lapping necessary with new seats and valves? ... This test is easier to do on an overhead valve cylinder head removed from the engine, but it can be done on a valve-in-block flathead. You'll need to have the valves and valve ...

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How to Grind Valves Correctly - YouTube

Jun 08, 2012  Learn how to properly grind valves. Use the correct techniques for valve lapping by machining them.TiredIronVideos/

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Valve Seats - Installing And Grinding Valve Seats - Learn ...

Dec 05, 2020  Learning how to machine, install and grind valve seats can help solve many; valve leakage and valve burning issues. The growth of the valve seats market can be traced, back to the early 1970s. This is when the switch to unleaded fuel took place. Most of the engines in use had to have replacement valve seats; inserted in the exhaust side.

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Rethinking The Valve Job - Popular Hot Rodding Magazine

Mar 01, 2012  Before cutting seats and grinding valves, experienced head specialists often whip out a calculator or spreadsheet to figure out what might work best for a given combination.

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Tech: Rebuild Or Buy New, The Great Cylinder Head Debate

May 25, 2016  If you want to do the job correctly, you will need to add in the cost of machining for new valve seals ($50/pair cylinder heads), the cost of the actual seals ($80/pair cylinder heads), and then a valve job and assembling each cylinder head ($200/pair cylinder heads).

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Do New Valves New Head need lapping? - IDI Engine ...

Nov 11, 2008  Do New Valves New Head need lapping? « Reply #7 on: November 11, 2008, 08:56:23 am ». I always lap them because the compound and time are cheaper than pulling the head if there is a leaky valve. Besides, no matter how "perfect" any part is made, there is

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Valve Seats - Installing And Grinding Valve Seats - Learn ...

Dec 05, 2020  Learning how to machine, install and grind valve seats can help solve many; valve leakage and valve burning issues. The growth of the valve seats market can be traced, back to the early 1970s. This is when the switch to unleaded fuel took place. Most of the engines in use had to have replacement valve seats; inserted in the exhaust side.

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The Daily Grind - Grinding valve seats with different ...

Mar 27, 2017  This seat material is designed to prolong the ability of the valve seat to seal against the pounding of the valve head during engine operation. The variety of materials also means new and different abrasives are required for proper machining. The first step in grinding seats is to know what you are grinding so you can select the proper abrasive.

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Tech: Rebuild Or Buy New, The Great Cylinder Head Debate

May 25, 2016  If you want to do the job correctly, you will need to add in the cost of machining for new valve seals ($50/pair cylinder heads), the cost of the actual seals ($80/pair cylinder heads), and then a valve job and assembling each cylinder head ($200/pair cylinder heads).

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Lapping New Valves - Help Hot Rod Forum

Nov 10, 2007  You'll really mess it up. A quick valve job to freshen up the seats is the most it will need. if you get carried away and create a groove in the valve, you'll be buying new valves as well as getting a complete valve job. As I said minor sweating around the valve is ok. You should have done a compression test before ripping the motor apart.

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Do you need to lap brand new valves with new seats ...

May 21, 2012  Definitely lap the valves and make sure you mark or number each valve so it can be fitted to it's matched seat. With a three angle valve job the seats will most likely have been cut to widths of around .060" for the inlets and .080" for the exhaust. So be careful not to overdo it with the lapping and cause the valve seats to widen.

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What you need to know before you pull that head off ...

Nov 12, 2018  You can test with light, liquid, air, or a combination. Note that, for all of these, the valves need to be in the closed position, so you either need to remove the camshaft and the valve train, in which case all of the valves are closed at the same time, or you need to rotate the cam to close the valve you’re testing.

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('98-'00) - Head gasket replacement, do I need to machine ...

Dec 12, 2016  You only need to take off as much as needed to get a flat surface. Most shops will mount up the head and take .005" cuts until the the whole surface has a fresh cut. Depending on the head that might be one .005" cut or 2, 3, or 4. The idea is to only take as much as needed however.

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New Valves without Re-cutting valve seats??? - Page 2 ...

Jan 06, 2013  There are many ways to cut valve seats even using the best machines to do the work will not always produce a perfect valve job.you can machine the seats using serdi style form cutters or the new when contour machine that cuts them with a single sided tool .you can mark the valve with a felt pen and drop the valve to the seat and turn it back and forth with a quarter turn and remove the valve ...

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Lapping valves....good idea or bad? The H.A.M.B.

Apr 14, 2006  1. You almost always need guides...but engines do indeed manage to seat wonky valve action. 2. You are widening seats and can't do anything about it...but the engine will learn to cope for a while. 3. You have to work in a wide potential seating area because you know the working seat is going to be a bit...elsewhere and you have to hope you're ...

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Cylinder Head 105 - Valve Job Basics - YouTube

Valves not sealing and they're not bent? This is one way to fix that problem.This is no longer the best example I have of this work. I recently covered thi...

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Valve lapping trick! How to lap valves the easy way. - YouTube

A simple shortcut to lapping valve seats. I've never had luck with those silly suction cup sticks. This method is much more efficient!Demonstrating on a Su...

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How to Port and Polish Your Car Cylinder Heads ...

Aug 09, 2016  Tip: When grinding be extremely careful not to grind any areas where the valve would officially make contact with the cylinder head, also known as the valve seat, or a new valve job will be the result. Step 7: Complete the other intake runners. After finishing the first intake runner move on to the second intake runner, third and so on.

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Valve lapping, for or against - Page 1 - Engines ...

Mar 25, 2011  Personally I would do a little bit of lapping with a fine paste when fitting new valves or new seats. I wouldn't bother if re-using valves with seats (assuming the valves go back in

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Valve Grinding 4 Engines : 8 Steps - Instructables

General directions for grinding valves on most engines with out expensive tools and with the know how to accomplish a very good job you will need a few simple things like 1.hand drill ( 300-400 rpm)is best 2. valve grinding compound 3. a glass or bowl of

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New valves cutting or lapping? Honda D Series Forum

Aug 04, 2011  valves made for the honda motors tend to have the angles pre matched to factory heads. lapping is generally necessary, but you dont always need a fresh cut. its simply recommended to prevent problems down the road. im a cheap ass if that wasnt a big enough indicator lol. J.

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What you need to know before you pull that head off ...

Nov 12, 2018  You can test with light, liquid, air, or a combination. Note that, for all of these, the valves need to be in the closed position, so you either need to remove the camshaft and the valve train, in which case all of the valves are closed at the same time, or you need to rotate the cam to close the valve you’re testing.

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Cylinder Head Rebuild - How To - Hot Rod Magazine

Jul 01, 1996  When rebuilding your heads, make sure the machine shop uses quality guides. If they insist on knurling your guides, find a new machine shop. Next are the valves. While old valves

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Do you need to lap brand new valves with new seats ...

May 21, 2012  Definitely lap the valves and make sure you mark or number each valve so it can be fitted to it's matched seat. With a three angle valve job the seats will most likely have been cut to widths of around .060" for the inlets and .080" for the exhaust. So be careful not to overdo it with the lapping and cause the valve seats to widen.

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('98-'00) - Head gasket replacement, do I need to machine ...

Dec 12, 2016  You only need to take off as much as needed to get a flat surface. Most shops will mount up the head and take .005" cuts until the the whole surface has a fresh cut. Depending on the head that might be one .005" cut or 2, 3, or 4. The idea is to only take as much as needed however.

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Valve lapping, for or against - Page 1 - Engines ...

Mar 25, 2011  Personally I would do a little bit of lapping with a fine paste when fitting new valves or new seats. ... machine or head seat cutting machine as the grinding

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Lapping valves....good idea or bad? The H.A.M.B.

Apr 14, 2006  1. You almost always need guides...but engines do indeed manage to seat wonky valve action. 2. You are widening seats and can't do anything about it...but the engine will learn to cope for a while. 3. You have to work in a wide potential seating area because you know the working seat is going to be a bit...elsewhere and you have to hope you're ...

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valve seat cutting needed or not? - WR250F/YZ250F/YZ250FX ...

Sep 18, 2007  (Only got 1000 miles out of that one) Now....I'm aware that that method is the "correct" way to do it. And if you have the $$$ for new heads, valve jobs every couple of months, etc. and want the maximum power out of your bike, then go fo it. If you need to make your money stretch and are not racing at a national level.....DO NOT go there.

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Chevy 461 Double Hump Cylinder Head Comparison - Tech Talk

Jul 11, 2019  Also, the new heads have an improved short side radius. If you look at an original set of 461 heads the floor of these heads is very flat and so what that does is it creates a very sharp turn for the air at the right angle bend down to the valve, that's not good for flow. These new heads have a raised floor and you'll see kind of a ramp in ...

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How to know when to replace valves or just seals and relap ...

May 12, 2015  The opening for the valve should be round, not oval, not egg shaped. The valve stem, when inserted into the guide, should be solid and not able to be wiggled around. Too much free play and it's time for new guides as well. This spec is also in the manual and you will need a

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Chevy Small-Block Cylinder Head Rebuilding and Assembly ...

If you are working on a set of iron production heads, there is often room between the intake and exhaust valves to increase the valve size. Many of the earlier 1.94/1.50- inch iron small-block heads offered sufficient room to go up to 2.02/1.60 inches.

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Valves: When to Reclaim, When to Replace - Engine Builder ...

Aug 26, 2010  Also, if you are replacing valves, replace the keepers. Don’t reuse worn keepers with new valves. That’s asking for trouble. Guide Repairs. On aluminum or cast iron cylinder heads with bronze or cast iron guides, the most common repair for worn guides is to simply knock out the old guides and install new guides.

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Vortec Cylinder Heads: The Definitive Guide NastyZ28

Jul 04, 2006  The bowl area is wide around the guide - much wider than the old 'camel-hump' heads from back in the day - and the intake valve seat has a 3-angle grind from the factory. The intake valve is also back-cut as is the exhaust.

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How do you grind your own valves?

Grind-in each valve (including new valves) by hand, using a valve-grinding tool and valve-grinding paste. Attach the sucker on the grinding tool to the valve face. On some modern cars the valve faces have a thin coating which must not be removed. When fitting coated valves, use an old valve to grind the valve

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How to Port and Polish Your Car Cylinder Heads ...

Aug 09, 2016  Tip: When grinding be extremely careful not to grind any areas where the valve would officially make contact with the cylinder head, also known as the valve seat, or a new valve job will be the result. Step 7: Complete the other intake runners. After finishing the first intake runner move on to the second intake runner, third and so on.

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Do you need to lap brand new valves with new seats ...

May 21, 2012  Definitely lap the valves and make sure you mark or number each valve so it can be fitted to it's matched seat. With a three angle valve job the seats will most likely have been cut to widths of around .060" for the inlets and .080" for the exhaust. So be careful not to overdo it with the lapping and cause the valve seats to widen.

Get Price

('98-'00) - Head gasket replacement, do I need to machine ...

Dec 12, 2016  You only need to take off as much as needed to get a flat surface. Most shops will mount up the head and take .005" cuts until the the whole surface has a fresh cut. Depending on the head that might be one .005" cut or 2, 3, or 4. The idea is to only take as much as needed however.

Get Price

New valves cutting or lapping? Honda D Series Forum

Aug 04, 2011  valves made for the honda motors tend to have the angles pre matched to factory heads. lapping is generally necessary, but you dont always need a fresh cut. its simply recommended to prevent problems down the road. im a cheap ass if that wasnt a big enough indicator lol. J.

Get Price

Chevy Small-Block Cylinder Head Rebuilding and Assembly ...

If you are working on a set of iron production heads, there is often room between the intake and exhaust valves to increase the valve size. Many of the earlier 1.94/1.50- inch iron small-block heads offered sufficient room to go up to 2.02/1.60 inches.

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The Correct Way To Lap Engine Valves In - CR4 Discussion ...

Aug 30, 2010  08/26/2010 12:06 PM. the conventional way to lap engine valves in is grinding paste and a sucker on a stick and rotating the valve back and forth using the hands. now why cant you use a drill on low speed lubricate the valve stem and take all the weight of the drill so no side ways thrust is placed on the valve guide ?

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New Valves without Re-cutting valve seats??? - Page 2 ...

Jan 06, 2013  There are many ways to cut valve seats even using the best machines to do the work will not always produce a perfect valve job.you can machine the seats using serdi style form cutters or the new when contour machine that cuts them with a single sided tool .you can mark the valve with a felt pen and drop the valve to the seat and turn it back and forth with a quarter turn and remove the valve ...

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Cost To Deck Heads Valve Job? SteelSoldiers

Feb 22, 2011  1,804. 20. 38. Location. Ephratah, New York. about $150 for 2 heads if the valve cups don't need to be cut. If the cups get cut it is $100 more in Johnstown, NY. Glad you know you have to get the heads planed to make the new head gaskets last. You will be happy.

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How to know when to replace valves or just seals and relap ...

May 12, 2015  The opening for the valve should be round, not oval, not egg shaped. The valve stem, when inserted into the guide, should be solid and not able to be wiggled around. Too much free play and it's time for new guides as well. This spec is also in the manual and you will need a

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DIY 3 angle valve grind? Yamaha XS650 Forum

Feb 04, 2013  Because unlike lapping, when you have valves that are being cycled thousands of times slamming the valve into the valve seat,the valve faces over time will become cupped or the seat faces become rounded and when you have a head like the XS where there's little air filtration for heat dissipation,warpage will occur in the valves and the seats and "No Amount Of Lapping" will true these

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Dan's Motorcycle "Valves"

If you do, you would be wrong. The English Rudge of 1929 had a 4 valve head. If you do re-grind the valves make sure the edge of the valve is not sharp or thin and is the correct angle. If it is thin, the valve will overheat and fail. Now we come to the seats. You will need to cut or grind the valve seat, at the correct angle, until it is ...

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Another Technique for Piston Notching. Ford Muscle Cars ...

Nov 02, 2009  As an example, a valve with a 2.08” head should have at least a 2.20” diameter pocket in the piston. (2.08 + (.060 x 2) = 2.20) So I used my piston stop, a degree wheel, light checking springs, and a degree wheel to first check PTV clearance. I found that the 2.08” intake valves had over .100” of PTV clearance, which was fine.

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How to Remove the Valve Seat From a Cylinder Head It ...

Step 1. Face the cylinder head (or heads) face up on a hard surface. Use carburetor and a wire brush to thoroughly clean the surface of all carbon build-up, scorch discoloration, oil, soot and foreign debris. Scrub the valve seat surfaces and combustion chambers until shiny. Clean the outside of the head in the same fashion. Wipe dry with a rag.

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