Dumb question:
TECH Senior Member
Joined: Jun 2016
Posts: 22,308
Likes: 3,625
From: Central Cal.
You don't know much about engines do you?
Heads are completely disassembled, cleaned, deck checked for true then milled if necessary, valve seats ground to spec, valves ground OR new ones put in, them all is reassembled and returned to owner.
Heads are completely disassembled, cleaned, deck checked for true then milled if necessary, valve seats ground to spec, valves ground OR new ones put in, them all is reassembled and returned to owner.
Not sure what your trying to accomplish ? But short of a multi angle professional vj .There is a procedure which is not a vj called lapping . This is a budget overhaul method to put a refinish grind on the seat.This can be done at very little expense.and does not require removing the valves.
better to find someplace that does a cnc valve job, it will keep the valve tips closer to the same height which is needed with our nonadjustable rockers. Sometimes with a ground valve job the heights will be all over the place.
Not sure what your trying to accomplish ? But short of a multi angle professional vj .There is a procedure which is not a vj called lapping . This is a budget overhaul method to put a refinish grind on the seat.This can be done at very little expense.and does not require removing the valves.
I left all of that up to my builder/machine shop. I was just curious about what all is involved. Someone that asks that sort of question has no business doing it himself, lol. Thanks, folks.
Trending Topics
TECH Addict
Joined: Dec 2017
Posts: 2,195
Likes: 980
Lapping is part of a VJ: it is the final process that seals the valve to the seat. Pretty much ALWAYS done. Mostly just removes fine irregularities: if it has to do any more than that, something wasn't done right beforehand. Or the valves are bent/warped. Usually done after the cutting & grinding, using some sort of very fine compound. (I usually use "Clover"... DO NOT buy the TRW or Loctite/Permatex stuff in a tube, it is like gravel) You can easily do it with a power drill. Typically you can have your seats cut, then buy new valves, then lap them; as long as everything is concentric and at the right angle, it'll all mate right up.
In the photo up there with the red Dykem, the narrow band all the way around the seat, was made by lapping.
In the photo up there with the red Dykem, the narrow band all the way around the seat, was made by lapping.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Hey Brock...in the words of the great Carl Sagan...
"There are naive questions, tedious questions, ill-phrased questions, questions put after inadequate self-criticism. But every question is a cry to understand the world. There is no such thing as a dumb question".
"There are naive questions, tedious questions, ill-phrased questions, questions put after inadequate self-criticism. But every question is a cry to understand the world. There is no such thing as a dumb question".
Lapping is part of a VJ: it is the final process that seals the valve to the seat. Pretty much ALWAYS done. Mostly just removes fine irregularities: if it has to do any more than that, something wasn't done right beforehand. Or the valves are bent/warped. Usually done after the cutting & grinding, using some sort of very fine compound. (I usually use "Clover"... DO NOT buy the TRW or Loctite/Permatex stuff in a tube, it is like gravel) You can easily do it with a power drill. Typically you can have your seats cut, then buy new valves, then lap them; as long as everything is concentric and at the right angle, it'll all mate right up.
In the photo up there with the red Dykem, the narrow band all the way around the seat, was made by lapping.
In the photo up there with the red Dykem, the narrow band all the way around the seat, was made by lapping.