B/RB mopar Alum.heads

[Cranky]

The thought has crossed my mind before about a short stroke big bore (400?) engine using Hemi heads. Nice flowing heads for a high rpm screamer......but it was a bit pricey for my pay grade

 

[rumblefish360]

The thought has crossed my mind before about a short stroke big bore (400?) engine using Hemi heads. Nice flowing heads for a high rpm screamer......but it was a bit pricey for my pay grade

Oh I hear ya! I have a 400 and I’m considering the PP240 on the stock stroke. I think this should be good in a ‘71 Duster.

 

[not so famous bob]

Stage V makes a Hemi Head conversion & manifolds for them
for both B/RB blocks to convert to a Hemi
other than the top head bolt at 12 o'clock position on a B/RB
it's "stud & nut" on the hemi, it's the same bolt pattern otherwise
a different casting to accept the nut, inside the valley,
where the "stud Vs a bolt" goes...

http://www.stagev.com/pages/hcheads.html

I read that they went out of business way back . In the first place, a 426 type head won`t work on a 383`s small bore, the valves would hang on the deck to start with. I also don`t understand how to use the top bolt, no boss in a wedge for it ! A person would have keep it a street set up, because the r/b wouldn`t take BIG hemi power in a dragrace scenario w/o splitting between the cam and mains !.

 

[BobJ]

Remember at one time hemi block and heads were rare as hens teeth. You were tripping over 440 blocks but if you found a hemi block you were going to spend big $$$ and then spend big $$$ on repairing a block that needed a lot of work. If you were a class racer you ponied up the money, but if it was for the street it was cheaper option for that Hemi wow factor on the street scene. I looked but always went with ported 906 or 915 heads with large vavles.

 

[68 HEMI GTS]

I read that they went out of business way back . In the first place, a 426 type head won`t work on a 383`s small bore, the valves would hang on the deck to start with. I also don`t understand how to use the top bolt, no boss in a wedge for it ! A person would have keep it a street set up, because the r/b wouldn`t take BIG hemi power in a dragrace scenario w/o splitting between the cam and mains !.

I know a guy who runs stage v conversion heads on a RB block in a 65 Belvedere. Has real good luck with it and runs deep in the 9’s.

 

[Brewzer67]

I read that they went out of business way back . In the first place, a 426 type head won`t work on a 383`s small bore, the valves would hang on the deck to start with.

The bore on a 383 block is the same as on the original 426" blocks. The valves are fine with the smaller bore because they open towards the cylinder centerline not just slightly canted like a wedge head. As long as your tune on the motor doesn't detonate and rattle the mains to death you can have an 800 hp motor live for a long time. You just need to keep the tune safe and the rpm's reasonable.

 

[LemonWedge]

The bore on a 383 block is the same as on the original 426" blocks. The valves are fine with the smaller bore because they open towards the cylinder centerline not just slightly canted like a wedge head.

^^^^^ THIS ^^^^^^
Factory bore of a Hemi and 383 are identical. Intake manifold would be a completely custom piece, however.