heads

[blaksunshine]

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