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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 12-30-2010, 02:54 PM   #1
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Default 370 build ?

Ok I have done 2 different setups.... now trying to see what are my options and possibly what kind of power im looking at!
Any help/suggestions on a setup would help thanks!

first setup


2004 Block - GM LQ9 Iron block

C.I - 6.0l 370

Stroke - stock 3.622

Crankshaft - Stock LS crank

Rods - Stock 6.098

Pistons - Diamond Pistons LS1 Forged Flat Top Piston set w/ -2cc Valve Reliefs

Rings - Diamond Racing Ring Set, 4.030 Bore

Head Gaskets - Cometic LS Multi Layer Steel Gasket 4.030 Bore

-----------------------------------------------------------------------------------------------------------------

2nd setup is about the same but a bit cheaper

2004 Block GM LQ9 Iron block

C.I 6.0l 370

Stroke 3.622

Crankshaft Stock LS crank

Rods 6.098

Pistons Mahle LS1314030F04 - Mahle PowerPak Piston and Ring Kit
Rings Included with powerpak

Head Gaskets Cometic LS Multi Layer Steel Gasket 4.030 Bore


-------------------------------------------------------------------------------------------------------------------


Now head options are either a slight port job on some 5.3 heads and bigger valves like stock size ls1 valves or some manely vavles

or might get some 243s with slight port job!
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Old 12-31-2010, 11:03 AM   #2
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I have a 370 with the same Diamond pistons with PRC 5.3 stage 2.5 heads. I am very pleased with the outcome. Can't say powerwise where you would be as there are many variables, but I don't think you will be disappointed at all.

I will be getting my dyno numbers this spring to see where I am at. I had to wait as I got a new rearend and needed to go through the break-in process of it.
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Old 01-03-2011, 10:16 AM   #3
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Sweet! .... I need to get this project rolling already ..... So hopefully I can order my pistons here soon!
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Old 01-04-2011, 08:48 AM   #4
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You'll like the 370, they can make great power. I also run PRC 5.3's on mine. Makes 500/450 at the tires through a heavy drivetrain and pushes my 3900lb sled to bottom 11's at 124mph on motor.
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Old 01-04-2011, 10:28 AM   #5
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Originally Posted by jmm98LS1 View Post
You'll like the 370, they can make great power. I also run PRC 5.3's on mine. Makes 500/450 at the tires through a heavy drivetrain and pushes my 3900lb sled to bottom 11's at 124mph on motor.
I was looking at your pics from your build (your link in ur sig for photobucket).........your using mahle pistons? are you using the stock rods on it aswell? Id like to know more info on your setup
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Old 01-04-2011, 11:08 AM   #6
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Quote:
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I was looking at your pics from your build (your link in ur sig for photobucket).........your using mahle pistons? are you using the stock rods on it aswell? Id like to know more info on your setup
Yep, mahle pistons and Scat 4340 I-beams (6.125"). Heads are shaved to 57cc (12:1 compression) and smoothed out exhaust ports, cam is a custom 24x/25x .613"/.613" 110+4, intake is a ported 92/92 with single stage direct port. Be happy to answer any other questions!
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Old 01-04-2011, 12:18 PM   #7
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Quote:
Originally Posted by jmm98LS1 View Post
You'll like the 370, they can make great power. I also run PRC 5.3's on mine. Makes 500/450 at the tires through a heavy drivetrain and pushes my 3900lb sled to bottom 11's at 124mph on motor.
and it sounds baddd asssss
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Old 01-04-2011, 01:24 PM   #8
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Originally Posted by N2OBaby View Post
Seems alot of folks here are building 370s with LQ4 or LQ9 blocks for N/A,N2O or FI.

I read GM High Tech Performance religiously and a 3.90 crank has has been mentioned several times.

With a +.020 overbore and a 3.90 crank a LQ4/9 could be made to be a 396 CID, with a +.030 overbore and a 4 inch crank is a 408, An additional +.010 overbore same crank 410 CID, same overbore and a 4.1 crank is 420 CID.

Is it purely economics that dictates 370s as opposed to biggier strokers?

Wouldn't a 396 or 410 engine make more HP/TQ and work less even with FI or N2O than a 364 or 370?
I personally am not looking to go big at all ...Just looking for a 6 sec car..... also its kind of a budget and not wanting to go into changing crank and what not ........
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Old 01-04-2011, 09:46 PM   #9
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I have the LQ4 bored .30 over, PRC 5.3 stage 2.5 heads (57cc) with Pred Z cam 230/232 .613/.598 on 111. I am using the stock crank and rods (GM 2005 year). Just have the LS6 intake for now, will be upgrading it in the near future.
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Old 01-05-2011, 08:49 AM   #10
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Originally Posted by Blu99T/A View Post
I have the LQ4 bored .30 over, PRC 5.3 stage 2.5 heads (57cc) with Pred Z cam 230/232 .613/.598 on 111. I am using the stock crank and rods (GM 2005 year). Just have the LS6 intake for now, will be upgrading it in the near future.
Nice.....what was your previous mods? Can u feel the difference?
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Old 01-05-2011, 08:07 PM   #11
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Nice.....what was your previous mods? Can u feel the difference?

Previous was a full bolt-on LS1 with about 3/4 of the suspension done and yes there is a night/day difference. The 370 would literally eats up and **** out my old LS1. It pulls much harder than the LS1 did everywhere in the RPM range.

FWIW - My buddy who rode with me compared my car to his Procharged LS1 on 8lbs of boost. He said they felt very close.
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Old 01-06-2011, 03:23 PM   #12
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Your getting me excited about this build!
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Old 01-06-2011, 09:44 PM   #13
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Just realized it was you I was talking to on youtube about the 370.
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Old 01-18-2011, 11:17 AM   #14
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ok thunder racing has thrown me off on the mahle pistons!

the part number is LS1314030F04

Now I read somewhere it was for 30 over stock crank and rod!

thunder racing says its for 6.125 rod? so which one is correct?
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Last edited by txh0tb0i972; 01-18-2011 at 12:12 PM..
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Old 01-18-2011, 03:42 PM   #15
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That part number is for a 6.125" rod
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Old 01-18-2011, 04:19 PM   #16
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LS13140030F04 is for the 6.098 rod correct?
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Old 01-19-2011, 08:55 AM   #17
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Quote:
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LS13140030F04 is for the 6.098 rod correct?
No, LS1340030F04 is the part number for stock length rod.
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Old 01-19-2011, 09:00 AM   #18
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got ya! thanks for pointing that out!
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Old 01-19-2011, 10:31 PM   #19
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Yes the 370 iron blocks run hard! I have one with Je pistons, Lunati pro billet rods, Ms3, TFS 215 heads on a 200 shot plate off the Fast 102 intake. Can you say in the 9's.
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Old 01-19-2011, 10:40 PM   #20
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good luck on that build bro!! I cant wait to run ya!!
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Old 01-19-2011, 10:40 PM
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