370 build ?
12-30-2010, 02:54 PM
#1
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!
12-31-2010, 11:03 AM
#2
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.
01-04-2011, 11:08 AM
#6
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!
01-04-2011, 01:24 PM
#8
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?
01-05-2011, 08:07 PM
#11
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.
01-18-2011, 11:17 AM
#14
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; 01-18-2011 at 12:12 PM.
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.
