425 V 455 what block would you use and why?
Thread Starter
Registered User
Joined: Jul 2012
Posts: 2,990
From: Vancouver BC
425 V 455 what block would you use and why?
What are the pros and cons of a 425 V 455 build?
425 short stroke V 455 long stroke
What is the benefit of each
engine rpm will be limited to 5000 to 5500
425 short stroke V 455 long stroke
What is the benefit of each
engine rpm will be limited to 5000 to 5500
Old(s) Fart
Joined: Mar 2007
Posts: 50,806
From: Northern VA
The 455 has 30 more cubic inches and pistons are far easier to get. The forged crank in the 425 is meaningless for your projected redline. Also, if the 425 has the 45 deg lifter bank angle or the 0.921" lifters, cam and/or lifter prices will be about double. That's about the extent of the differences.
Registered User
Joined: Nov 2012
Posts: 535
From: Deland Fla.
Joe said it all but I would like to add the 455 is what you want for that low rpm it has all the power and if you build it with the cam to match to intake and use a 750 to 780 cfm carb you will have a very responsive 455 that will run great and last. Good luck with your project.
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