Put 305 in '80 Z28?
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Joined: Jun 2001
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From: Rochester NY USA
Car: '97 Z28
Engine: 5.7
Transmission: M6
Put 305 in '80 Z28?
I will be building a 350 and a friend is interested in my 305 for his '80 Z28 four speed car. We have been told that the 305 is internally balaced, but his old 350 may be balanced with the flywheel. Can we do this swap? Thanks.
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Joined: May 2003
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You should be able to get some answers in here.
http://www.nastyz28.com/
http://www.nastyz28.com/
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Joined: Apr 2001
Posts: 4,969
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From: USA
Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Whoever told you that is right, but they got it backwards.
The 305 has a 1 pc rear main seal. Because of the design of the rear of the crank, they weren't able to put a counter weight (aka 'throw') on the back of the crank, so they relied on the flywheel/flexplate.
As long as you use the correct flywheel/flexplate it'll be fine. You don't really have a choice anyway. The bolt pattern on the 1 pc rear main seal cranks are smaller anyway.
The 305 has a 1 pc rear main seal. Because of the design of the rear of the crank, they weren't able to put a counter weight (aka 'throw') on the back of the crank, so they relied on the flywheel/flexplate.
As long as you use the correct flywheel/flexplate it'll be fine. You don't really have a choice anyway. The bolt pattern on the 1 pc rear main seal cranks are smaller anyway.
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