Cylinder Head Question
Thread Starter
Staging Lane
Joined: Feb 2012
Posts: 71
Likes: 0
From: South Mississippi
Cylinder Head Question I have my heads currently at the machine shop and wanting to know if i should mill them or leave them alone. I have a 408 with PRC LS3 heads and Diamond flat top pistons. Currently with my setup i am using .061 cometic gaskets with .013 pistons out of the hole which gives me .048 quench. The heads are 70cc and i have .200 PTV. Should i mill to acheive less PTV and more compression. The pistons will have 11.8:1, with 66cc heads, so i am currently around 11.2:1. Any help will be greatly appreciated.
Is the .200 PTV, intake exhaust or both? The exhaust is always the one to watch, as it is the one that will hit if it is late (floats). I have run intakes pretty close without problems.
Thread Starter
Staging Lane
Joined: Feb 2012
Posts: 71
Likes: 0
From: South Mississippi
It was .200 on exhaust. Tell me if my comp. ratio assessment is correct? My pistons Diamond 11519 are figured at -.10(positive) I have .014 out the hole with .061 head gaskets. Compresssion ratio on these pistons with a 66cc head are 11.6:1, and 62cc is 12.4:1. My heads are 70cc, so what will my ratio be. My quench is .048
Here you go, fully functional compression calc with all the goodies
https://ls1tech.com/forums/generatio...alculator.html
https://ls1tech.com/forums/generatio...alculator.html
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
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
My best results were with CR in the 11.3-11.4 range. Above that and we couldn't put in enough timing. I ran 12.0 and picked up about 30HP by dropping it to 11:4 and could add 4-5 degrees more lead. These heads lve timing and I learned not the trade compression to timing.
Just my $.02
Just my $.02
