Greetings, just discovered LS1Truck.com and digg it already! I have 03 Chev 5.3 LM7 in a shortbed reg cab and recently purchased a LS2 6.0 shortblock. After reading forums and talking with the local GM dealer I still have no clear answer to:
Will the top end of a LM7 5.3 bolt up to the shortblock of a LS2 6.0?
Without going into lengthy explaination of why; the blending of the two engines would be a temporary solution to a $$ money planning problem.
Thanks in advance ... -Toby
all cathedral port heads will bolt to the 6.0. 6.0, 5.3, and 4.8 intake manifolds are the same.
Last edited by cjriojas; 08-15-2010 at 03:03 AM.
'02 Silvy: Z71 EC Step Side 5.3L Nelson tuned
2013 GMC Acadia: SLT1 Carbon Black
1976 Corvette Stingray: Trying to save it, progress is slow.
^Ricky's Sweet PS Skilz
09/21/2010 02:31 <danger_ranger83> I'm not really worried about the looks...I want it to be fast and ugly...bc no one wants to get outrun by something ugly
The 862 heads from the 5.3 aren't gonna be the best thing for the LS2, but they will work. I would spend the few extra dollars to find some 243s at least.
Will the 243's work with the LS2 pistons? Won't those heads push the cr over the limit?
799 cast heads came on the Ls2 which are pretty much 243's.
'02 Silvy: Z71 EC Step Side 5.3L Nelson tuned
2013 GMC Acadia: SLT1 Carbon Black
1976 Corvette Stingray: Trying to save it, progress is slow.
^Ricky's Sweet PS Skilz
09/21/2010 02:31 <danger_ranger83> I'm not really worried about the looks...I want it to be fast and ugly...bc no one wants to get outrun by something ugly
799/243 heads on a LS2/LQ9 put you at 10.9:1 compression. No where near pump gas limits. Don't waste your time with those junky 5.3 heads on the bigger bore motor.
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