455 heads

[Barneybrendan]

Hi
We recently purchased the lemans post car.it has a 403 block and 455 heads.I read more that most people put 350 heads on the 403 .
What are pros and cons of using the 455 heads

 

[melsg5]

The article below pretty much explains the reason, better breathing than the small block heads which means more potential horse power.

Oldsmobile Cylinder Head Guide

The traditional Oldsmobile V-8 is unique, in that both small- and big-block versions can share the same cylinder head castings. While few would ever recommend bolting small-block heads on a big-block engine, using the big-block heads atop a small-block bottom end is a cool hot rod trick.

www.cartechbooks.com

 

[G-778193]

The article below pretty much explains the reason, better breathing than the small block heads which means more potential horse power.

Oldsmobile Cylinder Head Guide

The traditional Oldsmobile V-8 is unique, in that both small- and big-block versions can share the same cylinder head castings. While few would ever recommend bolting small-block heads on a big-block engine, using the big-block heads atop a small-block bottom end is a cool hot rod trick.

www.cartechbooks.com

Thanks that was a good read