370 build ?
Thread Starter
Joined: Apr 2007
Posts: 595
Likes: 14
From: Dallas/Lancaster
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!
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!
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.
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.
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.
Thread Starter
Joined: Apr 2007
Posts: 595
Likes: 14
From: Dallas/Lancaster
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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Thread Starter
Joined: Apr 2007
Posts: 595
Likes: 14
From: Dallas/Lancaster
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 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?
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Verdad Gallardo 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.
Thread Starter
Joined: Apr 2007
Posts: 595
Likes: 14
From: Dallas/Lancaster
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.
Thread Starter
Joined: Apr 2007
Posts: 595
Likes: 14
From: Dallas/Lancaster
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?
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?
Last edited by txh0tb0i972; Jan 18, 2011 at 12:12 PM.
