How much PTV clearance is required
How much PTV clearance is required Just as the title says, when checking for PTV what is the minimum amount of clearance required? Using the clay method, the valves didn't bust through the clay, but the intake valve looked rather close.
Thanks.
Thanks.
Minimum recommended values are 0.080" intake and 0.100" exhaust. One note on the values. For the intake valve, it is usually chasing the piston down the cylinder so you may be able to run a little tighter. On the exhaust, the piston is chasing the valve as it closes so you may want to have the minimum here. Good springs and valve train control are mandatory. Also, don't forget the entire valve train is a system of springs with one of the most flexible being the pushrod.
its not for my car... But the car in question has heads milled to 59cc, running a GM MLS gasket, a 242/244 vindicator cam and already has 90 thous flycuts on both intake and exhaust. It clears with a little bit of breathing room but just checking to be sure. The exhaust valve has a mile of clearance.
Vettenuts has it right. .080" and .100" are usually what we are looking for. Of course you can go a little less if you want but to be safe you want to make sure there is some decent room.
we did clay method with no flycutting on mine and the closeness was so close probably what ur experiencing, but it didnt bust thru the clay so we assembled it and i have no issues, about 6k miles since swap.
Trending Topics
With this car, i cut through the clay with a razor blade and measured with feeler gauges, looks to be aprox .090 of clearance on the intake, a TON on the exhaust. I think we are good to go, going off the ideal readings people have posted here.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
