i overheard some guys talking at the junkyard, they mentioned something about an certain Oldsmoblie crank and a 350 block that some how makes 440ci?
350... with 440ci
- Thread starter SUBLIME80BU
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Mondello used to make a kit. I think it had a modded olds 425 crank and chevy 454 rods. And tons of block mods but itsbeen done. Most start with the supper beefy 350 diesel blocks. Theyre actually really strong but America didnt know jack about diesel mechanics at the time. Especially stupid using existing gasoline architecture, beefing it up and hoping for the best.
As MrSony stated it would probably be a lot of mods to make it work, the 350 block has a stock bore of 4.057 and stock stroke of 3.385.
You would have to use a crankshaft from a 455 with it's 4.25 stroke to get to 440 CI the 425 only has a 3.975 which is probably easier to do and would give you a 411 CI but I don't know what would be involved in trying to squeeze either crank in there and of coarse both these CI numbers would increase with an overbore.
You would have to use a crankshaft from a 455 with it's 4.25 stroke to get to 440 CI the 425 only has a 3.975 which is probably easier to do and would give you a 411 CI but I don't know what would be involved in trying to squeeze either crank in there and of coarse both these CI numbers would increase with an overbore.
Always does, the big 4.25 stroke would probably have longevity issues in a 350 block and I am not sure what kind of rod ratio you would end up with a 350 deck height (9.33") but I would imagine the thrust side of the cylinder walls would see excessive wear also.
That's what I thought it was. 4.25 stroke crank, not a 425 crank. 😛 And you can only bore a 350 olds upto .068 over from what I remember. Anything more and you're playing with a 500lb bomb.
Not the case with the diesel blocks, they can safely go a bit further, as the cylinders are much thicker.
Modded 425 crank ( it's a forged crank remember ) and Olds 350 diesel block ( not a gas block ). I don't recall the rods or pistons. Overall build will not be cheap but when you're done you have a bulletproof engine that can handle almost anything you throw at it.
Big block power in a small block package!
Big block power in a small block package!
I am pretty sure, my next motor, a long ways off will be a diesel block stroker. I looked into it recently, and to do it right was a bit out of my price range, eventually though. There is something to be said about big block cubes in an easy to fit small block package.
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