replacement bbc heads? need info asap b/c owner taking them to swap meet tomorrow.

[blazin_blazer]

would these bbc heads be a good replacement for the peanut port heads on the newer engines? also, what are the difference in a closed chamber versus an open chamber heads? what is that referring to? would these 101cc heads bump compression up? would they have larger valves? what cc's are the newer smog heads?

3931063....68-69...oval..CLOSED..396, 402, 427, 101cc chamber

i don't want to seem pushy but, it would be great to get some opinions/facts on these heads today, as i only have today to make up my mind, then the guy who has them are taking them to a swap meet/car show tomorrow evening for the whole weekend & may not have them when he comes back home.

 

[blazin_blazer]

i have to make up my mind today or they maybe gone.

 

[76zimmer]

CLosed chamber heads have a Quench area that looks like a bath tub... oval shape. Open chamber have a more triangular shape to them, like a tri-oval race track.
I don't think you can run closed chamber heads on an open chamber piston, but you can run open chamber on a closed chamber piston.
I think open chamber are 119cc or so, and closed are 100cc or so.
I think they would be an improvement (intake port) over your peanut ports, but not sure about compatibility with an open chamber piston engine.

 

[4X4HIGH]

Not worth it. Closed chamber heads shroud the valves badly which means they don't flow very well. Also like 76zimmer said they might not work depending on what pistons are in your engine. You cannot use a closed chamber head with a domed piston. If your engine is a 454 from a truck (assuming it is since you have peanut port heads) that engine should have flattop pistons.

 

[fmstruck]

I have a pair of 063s on my 427. I've never flowed them, so I can't comment on their flow characteristics, but it's not like they are total junk. They probably do flow better than peanut ports. If they have good valves, seats and springs on them they could be worth grabbing. They would bump the compression up a bunch, probably too much, I'm not sure.

As far as closed/open chambers and domes are concerned, your dome has to match your chamber. Domes for closed chambers will hit open chambers and vice versa. If you're bolting them on a flat top motor, they would work. I've done this when looking to bump compression on my Propane motors.

 

[blazin_blazer]

alright thanks guys i passed on the heads, i need a bbc ''bible'' to learn these engines from...i learned the sbc from lots of reading and experience...this my 1st at playin w/bbc's