4.8 to 5.3 swap
#1
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4.8 to 5.3 swap
I bought a used 5.3 long block and was wondering if the stock computer will accept the newer engine ( currently a 4.8 ). My truck is a 1999 and the engine is from a 2001 model. My understanding is the only difference is the stroke, bore is the same. Thanks for any help.
#3
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Re: 4.8 to 5.3 swap
it will work. bore and stroke are a little different. have your heads sheaved down .020. any farther and you'll have alignment probs w/ the manifold. the combustion chamber on those heads are 61.15. more power will be noticed. you should also get ls1 edit to do any tuning
#4
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Re: 4.8 to 5.3 swap
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by sit n' low:
<strong> bore and stroke are a little different. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Bore is the same and stroke is alot different. Physically, it is the exact same block. Crank, rods, and pistons are different between the two.
One little interesting fact - to keep the 9.5: compression ration between the LM7 and the LR4, the 5.3 has dished pistons and the 4.8 have flat tops. Both are cast pistons.
<strong> bore and stroke are a little different. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Bore is the same and stroke is alot different. Physically, it is the exact same block. Crank, rods, and pistons are different between the two.
One little interesting fact - to keep the 9.5: compression ration between the LM7 and the LR4, the 5.3 has dished pistons and the 4.8 have flat tops. Both are cast pistons.
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