heads

i couldnt find a thread about this. my 99 has a 5.3 that is getting ready for its new life. the local engine builder has a set of 243 heads ported and polished , valve job , and srings. these are off of a 6.0 so ive been told. the question is with the bigger valves willl they work on my 5.3 . i dont realy know why but i want to keep the 5.3. intake 2.02 and exhaust 1.64 is 3.68 my bore is only 3.78 which leaves .100 im not real sure of the valve spacing and dont want to buy them if they are not going to work

243 will work fine but I'm pretty sure they need to be miled to get factory compression. But 6.0s never came with 243, they came with 317s

ok they did come off 6.0 i just got back from there he was unsure of the cast # he just thought 243 but they are off 6.0 . they are ported and polished 450.00 or same money to do my heads these are ones he did for customer that never got picked up. any suggestions buy heads or work mine . this is purely fo performance not worried about economy

The 243s were on the GTO and Corvette LS2 6.0L engines.

If they are 317s and not 243s....say bye bye compression....lol

Quote:

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Originally Posted by RedHeartbeat

The 243s were on the GTO and Corvette LS2 6.0L engines.

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Yes, and they also came on the LS6 5.7 litre engines. Which were the first engines to have them, from GM.

Greg and ^^ this guy are right!

honestly the 862's flow great already... however if i were going to pay 450 for P&P of the 862's or 450 for the P&P'd 317s i would take the 317's any day... just mill them down some to get the comp back up and it will work great!

thanx for the input guys