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Re: 4.8/5.3/6.0 Same as 5.7 LS1
The 4.8/5.3/6.0 engines are based off the LS1. I don't know if you coudl take LS6 heads and bolt them on to a 5.3 without some kind of modding (I mean you have to realize the valve sizes will probably be different, and so will the compression, and no doubt the cam).
I do know SLP has a short block that is a 402 stroker (I think it makes a 402), anyways, its an LQ4/LQ9 block (the 6.0 high output engine) that uses a 4 inch crank and pistons. They claim the engine is good for about 500 hp or so with the LS6 heads.
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**1966 Chevy II**
355 SBC, Turbo 400, 5.13 gear, IHRA Certified to 8.50 in the 1/4
Last Race (10-6-07) So its been awhile...
Dial: 6.77, RT: -.0001, 60': 1.4360, 1/8th: 6.7942 @ 100.65 mph
Fastest Pass of '07 (10-6-07)
60': 1.4360, 330': 4.3453, 1/8th: 6.7942 @ 100.65 mph
25 and in BIG TIME Debt Crew member #2 
Deuce's Wild Racing: Take a Ride on the WILD SIDE 
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