Thread: 427-454 build

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Yes, same stock rods all 396/427/454 use same 6.135" rod... Use a 427(+) piston... the wrist pin hole is higher in the 454 pistons... with 427 piston you will be at ~ 0 deck. As for 4.5" bore that's cutting it very close... going that far on bore sonic check is a must and even at that you would need to fill the water jackets with block rock... generally I've heard .100 over is about the most you can go safely without filling the water jackets and even at that sonic check is required... I have heard of instances of .125 over (4.375" bore) but you will be very lucky to find a block that has enough meat for that.... not to mention you're no longer looking at off the shelf pistons (.030, .060, .070, .100 over)

All this is supposing a factory block, not an aftermarket (Merlin, Dart, etc) which can handle much larger bore...

I'm definitely not the expert on this, many others on here can give you better info but this is my experience...

-Chris

SKIDS72
Thank you very much for the info. When I mentioned the large bore I was thinking after market. I'm just want to kick a few ideas around. Sounds like your engine works pretty well. The shorter stroke gives quick revs. I just built my 454 .030 over and will test it next weekend, hopefully I did everything right. I took my time and did a lot of research.