Thread: Stroker crank 4.25 or 4.50

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Originally Posted by stylingZ

I have a question for Pat regarding stroker cranks. I've been considering building a 496 with a 4.25 stroker crank & a .060 bore on a 454 which you are aware. Now my question is how difficult is it machining wise to step up from a 4.25 crank in a 454 to a 4.50" stroker crank and say only bore the 454 .030 (4.280") ending up with a 518 BBC stroker? I think if you used a 4.50 crank and bored the 454 .060 you would end up with a 525 cc BBC. I know there is no substitute for cubic inches. I have no idea as to how a 518 would run in comparison to a 525 cc BBC. I'm sure Pat and some of you other members have built these kind of engine so I'm wanting your input. Thanks in advance!

i have and you can put a 4.375 crank in a 9.800 deck block the 4.500 could be done but alot more $$ if your trying to get past 500 cid it may be better buying a block that can go to 4.500 to 4.625 bore that with a 4.250 crank can get you anywere from 540to past 565 and no need for custom pistons the CH for the 4.500 crank would be a ch of 1.140 or 1.165 would have alot to do with the deck heigth of the block now and you would need a cut counter weigth crank to get the 6.385 rod around the crank so added heavy metal very well will be needed. But you could run the 400 longer rod with a 2.100 sbc rod journal and with a 927 wrist pin could help with the counter weight and heavy metal but still have the very short ch of 1.015? could they be built ? i think with the small pin they could with .043 rings or have a set of custom rods so the ch could be around 1.070 or there are other ways to but all very $$$ so a dart or world block start looking like a great deal