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Old 02-21-2013, 07:11 AM
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Originally Posted by kiaser001 View Post
Hi all,

I just bought a 1980 K5 Blazer. It has a bad 305 in it and came with a rebuilt 305. I pulled the engine and noticed that the crankshafts were different. I researched and found out that there are 2 piece and 1 piece crankshafts. I determined that the new engine has a 2 piece crankshaft with what looks like a counterweight on the outside of the engine. Also the casting numbers says that this engine came from a 1980-1984 camaro,nova.

My question is if I use the new engine with the two piece seal and I buy a flywheel from autozone. due I have to worry about balancing the flywheel?
Ayuh,.... They're both considered Internally balanced motors, 'n the bolt pattern is different on the respective flywheels so's ya can't get it wrong...

If ya buy a flywheel for a 305, 2 piece rear main seal crankshaft, Yes, it'll be properly balanced...
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