Edit: new pic- look at these BBC heads

[tiger9297]

The heads on the right are the heads off my Gen V 454. Moretec.com lists them as "oval" ports. However, I have also seen them listed as "peanut" port heads. I set them side by side with an older Mark IV "236" casting which I know is for sure an "oval" port.

Side Note: the casting number on my heads is 10114156





My questions is, if you want to go with something other than the stock TBI and intake what options do I have? I'd like to go with the Howell MPFI unit, but if it's designed to work with true oval ports and mine are the peanut ports then they won't match.

 

[b454rat]

I'm not up on what Gen is what, but years were the Gen 5s?? But what they mean by oval and peanut ports are the intake, not the exhaust.

 

[tiger9297]

The Mark IV go through '90; the Gen V is '91-'95; the Gen VI is '96-?.

 

[tiger9297]

Yes, I posted the wrong pic and I can't get my camera to cooporate. My 10 month old pulled it off on the floor the other day and it's been a little "off" since then.

 

[tiger9297]

Finally got the pic off the camera. May too dark though.

 

[b454rat]

Too dark, can't see anything.

 

[4X4HIGH]

Get a much lighter pic and i'll tell you what you have. There are 3 different size ports for the most part. There is a peanut port or small oval, a large oval and a rectangle port. The peanut ports were used on trucks only, most passenger car heads were large oval and the rectangle ports were the LS6 and LS7 BBC used in Vettes and camaros. The later version of rectangle port heads were only used on crate engines as far as i know.

 

[k20]

Ok, I just cranked my monitor brightness all the way up, and those appear to be the small oval ports, as they appear to be nearly round. Like others said, post up a lighter pic, just to be sure.

 

[sweetk30]

full round is penut port.

oval with round corners is oval port.

square port with sharp corners is rectangle ports.


if the heads came off a tbi or mid 80s and up mostlikly penut ports.

 

[tiger9297]

ttt

 

[k20]

yeh those are round peanuts

 

[tiger9297]

so will an intake designed for oval ports work?

If not what options will I have?

Seeing as how this engine will probably never see more than 4k-5k RPM would the stock TBI and intake do as well as anything else?

I need some opinions on this one.

 

[k20]

well, as we've talked about in PM's, the edelbrock TBI-MPFI conversion, is made for the peanut port heads. That would probably be the quickest, simplest, and cheapest way to get it going. A true oval port manifold, would work in the sense that it would, but stepping down to the peanut port runners in the heads would be a major restriction on it, and would probably screw up the spray pattern from the injectors.

 

[b454rat]

I just lost my train of thought, but you could use the peanut style intake on the oval heads, but not the other way around. There will be a wall were the surfaces dont' line up. Motor would probly run like crap. I was told that you couldn't run oval port heads on a TBI motor, the TBI won't be able to keep up with the flow of the intake/heads. I guess if you get a bigger fuel system, you could get it to work. But I think even with a big inch BB, your not gonna be able to get high Rs with it, so I would think that it would work.....