4.8 Pistons in a 5.3?
01-29-2008, 06:29 PM
#1
Staging Lane
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4.8 Pistons in a 5.3? Hey guys I am cross posting this from the truck forum, I was still getting conflicting answers. I want to know if you could use the flat top 4.8 pistons in a 5.3 for an easy bump in compression.
I did some looking at mortec inc and did some math(I hope this is somewhat on the right track)
4.8 stroke 3.27"/5.3 stroke 3.622" | Difference=0.352"
4.8 rod 6.278"/5.3 rod 6.098" | Difference=0.18"
The change in crank throw that the rods have to make up would be =.176"
So in my mind the pin height between the 4.8 and 5.3 is 0.004" 4 thou doesn't seem like the much of a difference. So am I on the right track at all everyone?
I did some looking at mortec inc and did some math(I hope this is somewhat on the right track)
4.8 stroke 3.27"/5.3 stroke 3.622" | Difference=0.352"
4.8 rod 6.278"/5.3 rod 6.098" | Difference=0.18"
The change in crank throw that the rods have to make up would be =.176"
So in my mind the pin height between the 4.8 and 5.3 is 0.004" 4 thou doesn't seem like the much of a difference. So am I on the right track at all everyone?
01-30-2008, 11:38 AM
#2
The 5.3 piston dish volume is about 8.1cc, if that helps. There are CR calculators that should get you the CR based solely on the numbers. Since 4.8and 5.3 heads/valves are the same, I suspect there would be no PV clearance issues.
Some time back, I ran the numbers on different 4.8/5.3/5.7/6.0 crank, rod, and piston combinations and form memory that .004" is the correct difference in the deck height. I'm surprised no one on the truck forum could advise you. Those guys aren't afraid to try nearly anything; they truely have little fear!
Andy1
Some time back, I ran the numbers on different 4.8/5.3/5.7/6.0 crank, rod, and piston combinations and form memory that .004" is the correct difference in the deck height. I'm surprised no one on the truck forum could advise you. Those guys aren't afraid to try nearly anything; they truely have little fear!
Andy1
