Engine builder questions
Those poly motors are big and heavy. Thanks for the input though. :wink:
That is not entirely true. Some where here at the site I have put next to each other a "LA" shortblock and a '66 poly shortblock. I took pictures to be illustrative on the exact differances of the two.
I'm at work on my I-phone, so forgive me for not finding or repostings the pictures. I'll just restate them here in short.
There is NO size differance between the blocks!
Please read that last sentence again.
LA heads will fit and bolt on the Poly block BUT the Poly blocks water passages will not match the LA head at all.
There are less freeze out plugs on the block. Notably on the front.
The Poly block will only be heavier due to the thicker cylinder walls and extra metal due to the lack of freeze out plugs.
You can swap cranks around between the Poly and LA engines. As said before, the flange at the cranks rear is the issue to contend with per application.
Unless the "301" cube engine was around the corner, I would not search for one. Or the smaller 277 Poly engine.