370 build compression question
Thread Starter
Teching In
Joined: Feb 2016
Posts: 4
Likes: 0
370 build compression question So I’m new to the LS stuff but I’m starting my 370 build and having trouble figuring the pistons to run with the 317 heads. What is a decent compression ratio to run on 93 octane fuel?
im at 12.3:1 on 93. and mt tunet had Zero issues making it work. Just low timing. The setup was specd for e85.
If I were to build it again for 93 oct I would shoot for around 11.5:1 . so I could keep the timing in the upper 20's
-Mavn
If I were to build it again for 93 oct I would shoot for around 11.5:1 . so I could keep the timing in the upper 20's
-Mavn
These might help bump the compression up if using the 317 heads, valve reliefs, though a little heavier. I believe the product number has changed to PTS523A3.
https://ls1tech.com/forums/generatio...u-pistons.html
https://ls1tech.com/forums/generatio...u-pistons.html
These might help bump the compression up if using the 317 heads, valve reliefs, though a little heavier. I believe the product number has changed to PTS523A3.
https://ls1tech.com/forums/generatio...u-pistons.html
https://ls1tech.com/forums/generatio...u-pistons.html
Trending Topics
LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,233
Likes: 1,522
From: Ohio, Georgia, Nevada, Texas
The PTS523A3 series are a slight departure from the old Pro Tru PT124 pistons. With a 71cc chamber and net .045 piston to head clearance, they pump 10.9:1...still a little on the low side. Milling the heads .020 would net you about 11.25:1 which allows for full timing with an average street cam. Also, the pistons are 4032...so not quite as strong as a full blown Wiseco, but still good. As forged valve reliefs so you can run them with about any cam. They also have a .945 pin for the press fit Gen. 3 rods and you would leave the clips out if running press fit. If you are running a Gen. 4 rods, have the small ends honed to fit and you would use the clips they come with. This is a fairly inexpensive operation at your machine shop and while they are balancing your assembly. We have them in our warehouses for immediate delivery.
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 Thread Starter
Teching In
Joined: Feb 2016
Posts: 4
Likes: 0
If I was to run this piston with a 6.125 rod with the 317 heads and a ls9 head gasket. Would my compression be around 11.5:1?
https://www.summitracing.com/parts/wis-k447x3
https://www.summitracing.com/parts/wis-k447x3
LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,233
Likes: 1,522
From: Ohio, Georgia, Nevada, Texas
If I was to run this piston with a 6.125 rod with the 317 heads and a ls9 head gasket. Would my compression be around 11.5:1?
https://www.summitracing.com/parts/wis-k447x3
https://www.summitracing.com/parts/wis-k447x3
Last edited by Summitracing; Nov 27, 2018 at 01:35 PM.