408 stroker build
All Star
Joined: Jan 2009
Posts: 907
Likes: 2
From: Corrales, New Mecico
What make are the 30 over pistons, CR etc and what are you going to do with them?
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Record Breaker
Joined: Feb 2010
Posts: 1,504
Likes: 1
From: Chesapeake, VA
could be BS, but on moparts, one guy said hes gone 70 on plenty of 360s with no problems.... as a matter of fact there is a guy on this forum who went 80 over with no problems. HeyYou even asked him what machine shop was silly enough to do that. he said he hasn't had any problems though.
here are the pistons, as long as the block is good im selling them, if the blocks no good im keeping them. what about a custom oversize? and yes ik pistons will be EXPENSIVE, but they'll be cheaper than machining an old core.
here are the pistons, as long as the block is good im selling them, if the blocks no good im keeping them. what about a custom oversize? and yes ik pistons will be EXPENSIVE, but they'll be cheaper than machining an old core.
Administrator
Joined: Apr 2010
Posts: 87,399
Likes: 4,214
From: Clayton MI
All the manufacturers have trouble with core shift.... It isn't unique to Mopar. 
Custom oversize pistons would probably cost just as much, if not more, than getting a junkyard block prepped. Might even be able to find an already prepped bare block for cheaper.
Don't worry about it for now, cross that bridge when/if you come to it.
Custom oversize pistons would probably cost just as much, if not more, than getting a junkyard block prepped. Might even be able to find an already prepped bare block for cheaper.
Don't worry about it for now, cross that bridge when/if you come to it.
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Record Breaker
Joined: Feb 2010
Posts: 1,504
Likes: 1
From: Chesapeake, VA
funny thing is this is the FIRST time anyones mentioned that going 40 could give me problems. between two machinists and anyone else ive talked to.
im just hoping the current block will be in good shape to go 40. what are the thickness specs?
im just hoping the current block will be in good shape to go 40. what are the thickness specs?
Administrator
Joined: Apr 2010
Posts: 87,399
Likes: 4,214
From: Clayton MI
Numbers I am seeing range from .125, to .090..... and even as low as .080......
I also noted that a .040 overbore on a 360 is standard size for a 340.... might be something to look at, and save ya some bux on pistons.
I also noted that a .040 overbore on a 360 is standard size for a 340.... might be something to look at, and save ya some bux on pistons.
All Star
Joined: Jan 2009
Posts: 907
Likes: 2
From: Corrales, New Mecico
could be BS, but on moparts, one guy said hes gone 70 on plenty of 360s with no problems.... as a matter of fact there is a guy on this forum who went 80 over with no problems. HeyYou even asked him what machine shop was silly enough to do that. he said he hasn't had any problems though.
here are the pistons, as long as the block is good im selling them, if the blocks no good im keeping them. what about a custom oversize? and yes ik pistons will be EXPENSIVE, but they'll be cheaper than machining an old core.
here are the pistons, as long as the block is good im selling them, if the blocks no good im keeping them. what about a custom oversize? and yes ik pistons will be EXPENSIVE, but they'll be cheaper than machining an old core.
LA blocks, 340 blocks, early 360 Magnum blocks can take more overbore than the the present day Magnums.
All Star
Joined: Jan 2009
Posts: 907
Likes: 2
From: Corrales, New Mecico
Fingers crossed....Hope it all works, I'd love to do a 408, but my thing is bracket racing, sure I like to go fast, but nothing like taking out a blown Hemi Cuda because the guy can't drive.
I can run my dial in all day long...
I can run my dial in all day long...