Big Block vs Poly

RustyRatRod said
http://www.1962to1965mopar.ornocar.com/poly318.html

I do remember seeing that website a ways back. That fueled my interest in the Poly, even on a 402, they are pretty much maxed out at a little over 400hp. I see on the sight where is says that it should be good for 500+ HP, but nothin to back it up.

Killer6 said
The Stage VI bare casting weight came from mopar at 48lbs./pair, I have
personally weighed every other thing above,bare 452 castings 88lbs/pair incl., valvtrain of
course being equal so....... call ma mopar a liar. My friend had a set of Al. Stage VI's, but
didn't get to weigh them.You will save more weight on a SB switching heads&int. to alum.
than on a BB,that was the main point,and I'm still not buyin' the poly heads are 30lbs/pair
heavier than J/X castings. I need me some poly heads to weigh :) .
The logical thing is the SB,the coolest is the poly,the BB offers the most
HP potential since you're going Al. heads you can get the airflow to nix the extra mass.
Sounds like you prefer something different, and it's a stretch,but poss. in
polywood so I say go for it!! :glasses7:

So your talkin a difference of 10lbs. Still saving 80lbs on the BB and that is still a lot. Along with an aluminum master cylinder, battery relocate to the trunk, headers. Still will have a better weight distribution than a stock 440 Cuda and closer to a stock Small Block, so it should go around corners.

Poly Heads weight 51lbs each with out rockers arms. Actually over estimated the Poly, should be closer to 511lbs with aluminum intake
.
http://www.moparchat.com/forums/showthread.php?t=117690

Anyways always wanted to build a 451 or maybe a 470, Poly was just something new and different I discovered since I read about it in Chrysler Power. Probably would look out of place in an A-body and more at home in a B-body. Maybe could get away with it in an Early-A if it would fit.

More expense with a Poly, one extra expense that comes to mind would be custom headers.

I think I'm settled on a stroked 400.