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what is the max stroke can be used in std 454 block?

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what is the max stroke can be used in std 454 block?

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Old 10-16-2002, 06:27 AM
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Default what is the max stroke can be used in std 454 block?
any idea?
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Old 10-16-2002, 08:05 AM
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I think it's 4.5"-but that's with some serious clearancing.
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Old 10-16-2002, 08:47 AM
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The most I have ever heard is 4.25" in a standard 454 block. If you bore them .060" over and add a 4.25" crank you'll get 496 cubes which from what I understand is the most one can safely/reliably go on that block.
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Old 10-16-2002, 11:26 AM
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Hot Rod magazine has a special issue out going into detail about stroking.
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Old 10-16-2002, 12:11 PM
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at 4.25 how much machine work is needed ???????
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Old 10-16-2002, 12:16 PM
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I believe that 4.25" only requires some minor clearancing of the bore and pan rail for the rod bolts. I believe that they will clear the cam ok.
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Old 10-16-2002, 12:29 PM
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Depends on the crank you find or purchase. One supplier said a bit of trimming would be necessary in the oil pan area... we ended up having to grind about 1/4" off the counter weights... talk about pissed.
 
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Old 10-16-2002, 01:25 PM
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I recently did a 496 and only had to clearance at 1 point just above the pan rail because it was close but not touching. MkIV block, 4.25 steel crank and 6.385 billet rods. I believe that the billet rods are what allowed to get away from having to clearance the block.
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Old 10-16-2002, 03:16 PM
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thnx all
I get it as 4.25 max.

is it also same for first gen 502? 4.25 max stroke?
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Old 10-17-2002, 11:39 AM
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I put a 4.25 stroke crank in a 502 with NO clearancing/grinding

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