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Old 06-09-2014, 09:57 PM
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LQ4 or L76 6.0L GM Engine

Which engine is better for making 500HP out of and what are the pros cons of each?
I have a complete stock LQ4 engine, LS3 intake w/90mm throttle body, LS3 exhaust manifolds (longer version). I am debating wether I go with an L76 engine or just buy L92/LS3 heads for my LQ4...

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Old 06-10-2014, 06:49 AM
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Isn't one an aluminum block an the other iron? I don't remember. But I've read that the aluminum block can't be rebored because the steel sleeve is so thin, that is if there was any cylinder damage now or in the future.
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Old 06-10-2014, 07:05 AM
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Really need more info here... What is it going in? Whats the intended purpose other than 500 HP? Cruise, strip, track?

L76 is alu, LQ4 is an iron truck engine. The weight diffrence is 65lbs. Power is in the heads and the L92 can flow up to 550HP according to CarCraft and AFAIK the L76 has the updated l92 heads. If this motor is going an vehicle where handling is important than loosing 65LBS over the front Axle may be beneficial, if its going in a truck with stock suspension then maybe the weight inst as important.
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Old 06-10-2014, 08:31 AM
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The LS-3 heads will be what you end up with eventually(or better) Look at the ZO-6 427 and the heads they use to make 505 horse power?
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Old 06-10-2014, 09:07 AM
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Quote:
Originally Posted by vinniekq2 View Post
The LS-3 heads will be what you end up with eventually(or better) Look at the ZO-6 427 and the heads they use to make 505 horse power?
The engime is the LS7. To run the LS7 heads you need to run the larger 4.125" bore, wont work on the 4.0" bore 6.0's.

L92, L76 and LS3 heads are pretty muc the same head, differnt valves, they are designed for a 4" bore and larger.

CPP sells a 525hp 6.2L crate engine using the L92/LS3 head.

peace
PAuly
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Old 06-10-2014, 09:42 AM
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The motor is going in my 1936 Chev and will be used to cruise, race occasionally.
The L76 has the VVT setup, will this hinder me in making 500HP at all?
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Old 06-11-2014, 05:14 AM
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It can be removed. The lifters dont take rpm like the non AFM engines do.
Example of this is the 400hp Camaro L99 with its 6200rpm redline and the 426 hp 6.2 LS3 and its 6600rpm redline. L99 has VVT/AFM the LS3 doesnt.

GEN 5 LT1/LT4 have the full redline with a redesign in the GEN 5 engines.

GEN 3 and 4 head comparison Carcraft
GM Gen III V-8 Cylinder Head Comparison - Car Craft Magazine

AFM/VVT delete kit
Displacement on demand / active fuel management delete kit DOD AFM

PCM recalibration will bring all your mods together.

peace
Hog
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Old 06-11-2014, 05:57 AM
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I finally found the link to an article that compares all the GEN 3 and GEN 4 engines.

Performance Chevy LS Engine Comparison - Chevy High Performance Magazine - View All Page

peace
Hog
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