Pushrod Length And PTV Clearence
Thread Starter
TECH Regular
iTrader: (7)
Joined: Aug 2009
Posts: 444
Likes: 2
From: Muscle Shoals AL,
Pushrod Length And PTV Clearence Ok so we just completed checking all of my dimensions, just wanted to post them up and see if everything checks out with what everyone on here is running.
Intake and Exhaust both measured out to require 7.450" to acveive a .080" preload.
Intake PTV measured out to be .058".
Exhaust PTV measured out to be .179".
Intake and Exhaust both measured out to require 7.450" to acveive a .080" preload.
Intake PTV measured out to be .058".
Exhaust PTV measured out to be .179".
Ok so we just completed checking all of my dimensions, just wanted to post them up and see if everything checks out with what everyone on here is running.
Intake and Exhaust both measured out to require 7.450" to acveive a .080" preload.
Intake PTV measured out to be .058".
Exhaust PTV measured out to be .179".
Intake and Exhaust both measured out to require 7.450" to acveive a .080" preload.
Intake PTV measured out to be .058".
Exhaust PTV measured out to be .179".
pushrod length has nothing to do with PTV unless you have bottomed out the lifter
intake is a bit close, but it should be fine
exhaust has plenty of room and then some
the normal standard is .80/.100 for safety.
if you only used 5/16 pushrods... they will flex some and help with PTV clearance on the intake
over rev has nothing to do with PTV...but valvetrain stability does...
so make sure the rest of your valvetrain is up to snuff....good springs, plenty of open pressure to control Lifter Loft and bounce.
shim springs to be within .050 of coil bind..
intake is a bit close, but it should be fine
exhaust has plenty of room and then some
the normal standard is .80/.100 for safety.
if you only used 5/16 pushrods... they will flex some and help with PTV clearance on the intake
over rev has nothing to do with PTV...but valvetrain stability does...
so make sure the rest of your valvetrain is up to snuff....good springs, plenty of open pressure to control Lifter Loft and bounce.
shim springs to be within .050 of coil bind..
TECH Regular
Joined: Sep 2013
Posts: 410
Likes: 0
Thread Starter
TECH Regular
iTrader: (7)
Joined: Aug 2009
Posts: 444
Likes: 2
From: Muscle Shoals AL,
pushrod length has nothing to do with PTV unless you have bottomed out the lifter
intake is a bit close, but it should be fine
exhaust has plenty of room and then some
the normal standard is .80/.100 for safety.
if you only used 5/16 pushrods... they will flex some and help with PTV clearance on the intake
over rev has nothing to do with PTV...but valvetrain stability does...
so make sure the rest of your valvetrain is up to snuff....good springs, plenty of open pressure to control Lifter Loft and bounce.
shim springs to be within .050 of coil bind..
intake is a bit close, but it should be fine
exhaust has plenty of room and then some
the normal standard is .80/.100 for safety.
if you only used 5/16 pushrods... they will flex some and help with PTV clearance on the intake
over rev has nothing to do with PTV...but valvetrain stability does...
so make sure the rest of your valvetrain is up to snuff....good springs, plenty of open pressure to control Lifter Loft and bounce.
shim springs to be within .050 of coil bind..
The new heads were set up by Tooley for my Yella Terra's. So everything should be good.
I'll be calling Brian tomorrow to order the pushrods and I'll discuss my PTV and everything with him.
I just posted up my dimensions to see if I within the ballpark.
VLS1, man the cam card is out in the shop, and it's raining and cold as heck today. I'am just now begining to warm up from my last trip ouy there.
that intake PTV clearance is a little close for comfort... especially the intake valve since its moving down as the piston is going up. if you have a well built valvetrain and you dont over rev the car you should be ok. but one mistake and there goes the valve. i always liked .080 intake and .120 exhaust
~.060" intake clearance is fine. Things expand when they are hot and this is why you need sufficient clearance in the .060" range. .080 may be ideal, but most "cam" only setups run much closer than that on the intake.
Trending Topics
Thread Starter
TECH Regular
iTrader: (7)
Joined: Aug 2009
Posts: 444
Likes: 2
From: Muscle Shoals AL,
Thanks guys, I spoke with Brian Tooley, today, as he is the one that I bought my top end setup from. He thinks that maybe when we checked PTV clearance that we made a boo boo. So we will be re-checking this before we install the new pushrods. As I should have alot more than what I was coming up with.
The heads were setup by Brian for Yella Terrs rockers. Hopefully my new head studs will be here tomorrow and I can proceed on!!!
The heads were setup by Brian for Yella Terrs rockers. Hopefully my new head studs will be here tomorrow and I can proceed on!!!
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo When you say setup, do you mean he included the necessary shims for the pedestal to get proper wipe? Make sure those are installed and the wipe is narrow on the valve before you measure pushrod length. Also... bolt everything down and get everything installed as you plan to run it before you measure PtV. I made that mistake and I was off .015"... which normally isn't much, but I have the short travel lifters.
Thread Starter
TECH Regular
iTrader: (7)
Joined: Aug 2009
Posts: 444
Likes: 2
From: Muscle Shoals AL,
When you say setup, do you mean he included the necessary shims for the pedestal to get proper wipe? Make sure those are installed and the wipe is narrow on the valve before you measure pushrod length. Also... bolt everything down and get everything installed as you plan to run it before you measure PtV. I made that mistake and I was off .015"... which normally isn't much, but I have the short travel lifters.
Last edited by Bama99z; Dec 9, 2013 at 09:15 PM. Reason: spelling
