Boring 5.3 to 3.900 bore
Boring 5.3 to 3.900 bore Has anyone ever seen a gen III 5.3 block NOT be able to handle a 3.900 bore? I'd like to bore it to 3.900 and boost it with a turbo. Am I pushing it boring that far and boosting to say a max 15 psi?
TECH Addict
Joined: Jul 2013
Posts: 2,189
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From: Portland, Oregon
People have certainly done it. I would definitely get it sonic checked. I cannot remember the specific agreed upon safe minimum wall thickness for boost, but I am sure that piece of information isn't too hard to find searching this forum.
Looks like anything over .200" is considered safe for boost, from what I just found on google.
JE has ready to go pistons in 3.898" and 3.905" bore sizes with a compression height of 1.175, which is perfect for 6.25" rods. Eagle and Scat both make relatively cheap 6.25" forged rods, which give you a 1.73 rod ratio with a 3.622" stock stroke crank.
Looks like anything over .200" is considered safe for boost, from what I just found on google.
JE has ready to go pistons in 3.898" and 3.905" bore sizes with a compression height of 1.175, which is perfect for 6.25" rods. Eagle and Scat both make relatively cheap 6.25" forged rods, which give you a 1.73 rod ratio with a 3.622" stock stroke crank.
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Joined: Jul 2013
Posts: 2,189
Likes: 123
From: Portland, Oregon
After a little more research, it looks like anything over .18x" is regarded as safe for boost. Obviously there are going to be people who have boosted thinner walls, but the research I have seen concludes that anything over .180" is plenty for boost.
Aluminum 5.3 "late" block My experience IS more directed at the "late" 5.3 Aluminum Block @ 88mm (3.86") bored.
This block has "equal" head bolts, NO breather hole between Main/Cam, Cam Timing Chain block, .etc.
Sonic Tested @ .160" is common.
Would this be the one you are speaking about ?
Lance
This block has "equal" head bolts, NO breather hole between Main/Cam, Cam Timing Chain block, .etc.
Sonic Tested @ .160" is common.
Would this be the one you are speaking about ?
Lance
I forgot to mention, this is a Gen III iron block. I was just wondering if some of these blocks wouldn't handle a 3.900 bore. My block is gonna need a bore, and i figured why not take it out a bit more.
I just don't know if it is worth it or not to bore it say .030 over and use a Speed Pro hyper piston or not.
I just don't know if it is worth it or not to bore it say .030 over and use a Speed Pro hyper piston or not.
IMO, I would bore/hone it out only as far as it needs to cleaup up and/or for the next sized up shelf piston.
You won't notice a few extra CI in a 15psi turbo motor...so no sense in overboring it just for the sake of it. And don't bother with hyper pistons at that point, get some budget forged units.
You won't notice a few extra CI in a 15psi turbo motor...so no sense in overboring it just for the sake of it. And don't bother with hyper pistons at that point, get some budget forged units.
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IMO, I would bore/hone it out only as far as it needs to cleaup up and/or for the next sized up shelf piston.
You won't notice a few extra CI in a 15psi turbo motor...so no sense in overboring it just for the sake of it. And don't bother with hyper pistons at that point, get some budget forged units.
You won't notice a few extra CI in a 15psi turbo motor...so no sense in overboring it just for the sake of it. And don't bother with hyper pistons at that point, get some budget forged units.
Thats the thing, only wiseco makes a piston in a bore that small, 3.800. At $750, they aren't really budget. Any thoughts on using a mahle 4032 piston? It would be much quieter than a 2618 piston.
If I have time later I might dig it up.