Originally Posted by ArmyRover

Actually they are based on the buick 215 V8 which it shares parts with and was a all aluminium engine.

Originally Posted by robertf

I just did some real quick and dirty calcs using advertised torque to get cylinder pressure, average pedestal length at a 1.8, assuming grade 8 proof load of 120ksi, ambient to engine temp delta of 120F, and .2 for bolt torque force equation. 1 bolt out of spec and it'll fail for sure.




DISPLACEMENT # BOLTS FASTENER FT-LBS ENGINE FT-LBS CLAMPING FORCE FASTENER SAFETY FACTOR
3.5 14 55 210 115500 1.2
3.9 14 55 250 115500 1.19
4.6 14 55 300 115500 1.18
3.5 10 65 210 97500 1.06
3.9 10 65 250 97500 1.05
4.6 10 65 300 97500 1.04

Originally Posted by Sixpack577

I knew it was "based" on that old design, but did not know it was all aluminum.
Are you sure the Buick 215 was aluminum heads and block??
What parts does it share? Heads are different, displacement is different, intake different, it had a distributor, which drove an oil pump, so front cover is different.

Originally Posted by Sixpack577

Are you sure the Buick 215 was aluminum heads and block??

Originally Posted by ArmyRover

Yes it was.

Cam, lifters timing chains etc

Originally Posted by Alex_M

Same block, same heads. The block has been bored, but it's still the same. Bosch engine is the only one that didn't have a distributor also.

Originally Posted by Sixpack577

Cam is not the same.
Specs are different, and the Buick cam has a gear drive on it.