compression with 317's and mls?

Reply Subscribe

Thread Tools

Search this Thread

Jul 26, 2009 | 12:03 PM

needaz28

Thread Starter

11 Second Club

iTrader: (15)

Joined: May 2007

Posts: 349

Likes: 0

From: tucson

compression with 317's and mls?

I have a stock bottom ls6. I want to put the 317 heads I have on to lower compresiion abit while I build my 6.0 block. how big (thick) can I go with a mls gasket. I know I cant get the compression to low with head gaskets. but with 317's and a thicker head gasket how low can I get it. I would like to get down to 9.2:1 if its possible.

thanks

Jul 26, 2009 | 01:22 PM

dudeman

8 Second Club

iTrader: (43)

Joined: May 2007

Posts: 988

Likes: 0

From: texas

i have used a couple of different compression calculators and some show 9.6 and some show 9.8. how much boost do you plan on running?

http://www.race-cars.net/calculators...alculator.html

Jul 26, 2009 | 04:23 PM

needaz28

Thread Starter

11 Second Club

iTrader: (15)

Joined: May 2007

Posts: 349

Likes: 0

From: tucson

I would like to run 7-8 daily, then like 12 or so with pump/meth at the track. maybe crank it up a bit more if I ever get it running on e85.

Jul 26, 2009 | 05:43 PM

Reject

TECH Senior Member

iTrader: (24)

Joined: Apr 2005

Posts: 9,195

Likes: 4

From: Texas

you'll be safe, thats safe boost with a good tune. ive had mine to 16 on the stock block with 317 heads and 3 layer mls. wont last much longer but owell

Jul 26, 2009 | 06:06 PM

dudeman

8 Second Club

iTrader: (43)

Joined: May 2007

Posts: 988

Likes: 0

From: texas

i run 12-13psi daily on mine on pump gas and no meth. i am using 6.0 gm mls gaskets.

Jul 26, 2009 | 06:43 PM

needaz28

Thread Starter

11 Second Club

iTrader: (15)

Joined: May 2007

Posts: 349

Likes: 0

From: tucson

what is the compressed thickness you guys are running?

Jul 26, 2009 | 07:03 PM

dudeman

8 Second Club

iTrader: (43)

Joined: May 2007

Posts: 988

Likes: 0

From: texas

.053 part number 12589227.

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

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

Jul 27, 2009 | 12:18 PM

dudeman

8 Second Club

iTrader: (43)

Joined: May 2007

Posts: 988

Likes: 0

From: texas

what valve springs are you using? i used prc's so i changed to tsp push rods.

Jul 27, 2009 | 01:42 PM

#10

needaz28

Thread Starter

11 Second Club

iTrader: (15)

Joined: May 2007

Posts: 349

Likes: 0

From: tucson

Ls6 springs,ls6 cam. Set-up made 550 when I had a sts. Not sure what pushrods are in it. I bought the car with the sts. Sold that and built my own front mount.

Jul 27, 2009 | 02:43 PM

#11

trans2000am

TECH Fanatic

iTrader: (49)

Joined: Feb 2006

Posts: 1,518

Likes: 0

From: detroit

prolly 7.40

Jul 27, 2009 | 08:43 PM

#12

needaz28

Thread Starter

11 Second Club

iTrader: (15)

Joined: May 2007

Posts: 349

Likes: 0

From: tucson

so i shouldnt have to change them then? what if i put ls7 lifters in, since mine have about 100k on them.

Jul 27, 2009 | 09:38 PM

#13

WS6HUMMER

10 Second Club

iTrader: (19)

Joined: Feb 2004

Posts: 2,542

Likes: 2

From: Alexandria La.

You run a 6.0 MLS gasket for a 317 head on an LS1 right? I have a set of 317's I wanna slap on too.

Jul 27, 2009 | 09:51 PM

#14

dudeman

8 Second Club

iTrader: (43)

Joined: May 2007

Posts: 988

Likes: 0

From: texas

yup, 12589227

Jul 27, 2009 | 09:56 PM

#15

WS6HUMMER

10 Second Club

iTrader: (19)

Joined: Feb 2004

Posts: 2,542

Likes: 2

From: Alexandria La.

Quote:

Originally Posted by dudeman

yup, 12589227

Thanks.

Jul 27, 2009 | 11:54 PM

#16

Silver_TransAm

11 Second Club

iTrader: (2)

Joined: Mar 2007

Posts: 608

Likes: 1

From: San Antonio, Tx

Quote:

Originally Posted by dudeman

i run 12-13psi daily on mine on pump gas and no meth. i am using 6.0 gm mls gaskets.

Same setup here.

I've run 15psi in 100+temps with just an a2a no meth setup. You should have no probs with what you plan to do.

Jul 27, 2009 | 11:59 PM

#17

blue00ZZleeper

11 Second Club

iTrader: (5)

Joined: Aug 2007

Posts: 1,453

Likes: 2

From: Oceanside CA

Looks like a couple of us got info we needed lol. I plan on putting a set of 317's on here in the next couple weeks, run 12psi and hopefully run meth...thanks for the part numbers guys..deff made stuff easier...also hope I dont blow it up lol

Jul 28, 2009 | 07:36 AM

#18

needaz28

Thread Starter

11 Second Club

iTrader: (15)

Joined: May 2007

Posts: 349

Likes: 0

From: tucson

Quote:

Originally Posted by Silver_TransAm

Same setup here.

I've run 15psi in 100+temps with just an a2a no meth setup. You should have no probs with what you plan to do.

thats good to hear, temps are 100 + in tucson at night lol. so I should be good for what I want to do.

only thing left to figure out is if ls7 lifters are taller then ls1 lifters. if there the same I dont have to get different pushrods.

Jul 28, 2009 | 07:45 AM

#19

dudeman

8 Second Club

iTrader: (43)

Joined: May 2007

Posts: 988

Likes: 0

From: texas

i hear the cup sits .05 higher than the ls1 lifter.

Reply Subscribe

compression with 317's and mls?

compression with 317's and mls?

Trending Topics

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die