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!