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LANDC · 03-22-2011, 06:48 PM

454 engines are externally balanced, I am not sure if 305's are, I don't think so. As a matter of fact I made the exact swap in my 'Cruiser. If you are going to buy a new flywheel, see to it that it is a 454 externally balanced flywheel. And don't cheap out. Along with your new flywheel, it is advisable to pickup a new clutch/PP setup as well. Are you building big power? Hopefully the flywheel you have now with the 305 is a 168 tooth/ 14" one. I never looked into a 154 tooth/12.5 flywheel. If the flywheel you have and the one you get are the same, the 454 will work with all your existing stuff, starter, bellhousing etc. As for your other concerns, I don't know. Like I said I made the same swap in a non Chevrolet frame/vehicle so I am aware of some of the minor driveline details. I had starter issues that I wouldn't wish on anyone.

03-22-2011, 06:48 PM	#2
LANDC Registered User Join Date: Oct 2008 Location: Kelowna, BC, Canada Posts: 93	Re: Engine swap question 454 into my '83 454 engines are externally balanced, I am not sure if 305's are, I don't think so. As a matter of fact I made the exact swap in my 'Cruiser. If you are going to buy a new flywheel, see to it that it is a 454 externally balanced flywheel. And don't cheap out. Along with your new flywheel, it is advisable to pickup a new clutch/PP setup as well. Are you building big power? Hopefully the flywheel you have now with the 305 is a 168 tooth/ 14" one. I never looked into a 154 tooth/12.5 flywheel. If the flywheel you have and the one you get are the same, the 454 will work with all your existing stuff, starter, bellhousing etc. As for your other concerns, I don't know. Like I said I made the same swap in a non Chevrolet frame/vehicle so I am aware of some of the minor driveline details. I had starter issues that I wouldn't wish on anyone. __________________ Custom Vehicle, Custom Problems.