Ls2 with ls3 top end, ptv clearance
Thread Starter
Teching In
Joined: Mar 2017
Posts: 5
Likes: 0
Ls2 with ls3 top end, ptv clearance im sure you guys have seen this numerous times but I can't get a good answer. Ive got an ls2 along with ls3 heads (0821 cast heads), I'm having a hard time finding out what the max cam lift is without having to fly cut the pistons. Heads are not milled or anything but I will be installing dual valve springs for the cam. Thanks any info is appreciated.
Lift has zero bearing on PTV. It's duration. At TDC, depending on duration, valves are closed or nearly closed. At peak lift, you're at 106-120 degrees past TDC, which means the piston is an inch and a half away from the valves at least.
You can have a 250/260-110 cam with .500 lift that'll have PTV contact. You can have a 210/220-120 cam with .800 lift that'll clear with room to spare
You can have a 250/260-110 cam with .500 lift that'll have PTV contact. You can have a 210/220-120 cam with .800 lift that'll clear with room to spare
Thread Starter
Teching In
Joined: Mar 2017
Posts: 5
Likes: 0
Lift has zero bearing on PTV. It's duration. At TDC, depending on duration, valves are closed or nearly closed. At peak lift, you're at 106-120 degrees past TDC, which means the piston is an inch and a half away from the valves at least.
You can have a 250/260-110 cam with .500 lift that'll have PTV contact. You can have a 210/220-120 cam with .800 lift that'll clear with room to spare
You can have a 250/260-110 cam with .500 lift that'll have PTV contact. You can have a 210/220-120 cam with .800 lift that'll clear with room to spare
So don't worry about lift, only duration?
Thread Starter
Teching In
Joined: Mar 2017
Posts: 5
Likes: 0
Lift has zero bearing on PTV. It's duration. At TDC, depending on duration, valves are closed or nearly closed. At peak lift, you're at 106-120 degrees past TDC, which means the piston is an inch and a half away from the valves at least.
You can have a 250/260-110 cam with .500 lift that'll have PTV contact. You can have a 210/220-120 cam with .800 lift that'll clear with room to spare
You can have a 250/260-110 cam with .500 lift that'll have PTV contact. You can have a 210/220-120 cam with .800 lift that'll clear with room to spare
Originally Posted by Zamarripa493
Sorry I'm a rookie to all this lol.
So don't worry about lift, only duration?
So don't worry about lift, only duration?
Originally Posted by Zamarripa493
cam specs are 230/238 @.618
Originally Posted by coltboostin
Put a head on and clay it. Only way to know with 100% certainty
Thread Starter
Teching In
Joined: Mar 2017
Posts: 5
Likes: 0
Trending Topics
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
