273 to mid 70's 318

[toolmanmike]

I haven't looked in my rebuild books but do any of you know if the crank
register is the same between a 1966-273 and a 1985-318? I have a 85-318
and need to know if the flywheel from my 66 273 will bolt on. Would be nice to know before I build the motor. thanks toolmanmike

 

[C130 Chief]

Should bolt in. Make sure there is an adequate counterbore for your pilot bushing. I don't think the crank flange moved in-out over the years. Hopefully somebody has measured a later crank to confirm. There might be a balance issue so you may wish to have everything spun if it is out of the chassis.

 

[toolmanmike]

Thanks for the info Chief. I didn't want to build a motor and find out it wouldn't work without changing everything else. toolmanmike

 

[grumpuscreature]

Sorry to rain on your parade but the crank register changed in 1968. Your '66 flywheel won't bolt up to an '85 crank. The '85 crank won't be drilled for a pilot bushing either. On the brighter side though, all you will need is a neutral balance small block flywheel from '68 up and the MP pilot bearing for an automatic crank. You will have to cut about 3/4" off the nose of the transmission input shaft to make it work. If it was me, I'd put the '66 crank in the '85 block.

 

[toolmanmike]

Good idea, I diddn't think of that. I just happen to have an extra forged 273 crank in the garage. Any body need a 85 318 crank? Freshly turned 10-10.
toolmanmike