454 differences! help!

[POORBOYK5]

wow...... I thought gm had the most interchangable stuff.... till I got a 454... I'm soo confused now. talk about differences. this head can't go on this block, oval ports, square ports, I've got an 88 454 ( gen IV I'm assuming ) it was originally carb'd and I bought a edelbrock TBI intake for it, that claims to fit 87-90 454's.... well.... I've got the little ports, oval? (it seems everyone calls them something different) and the intake is square? (larger rectangular ports) what am I missing here? It appears that Gm was using both styles through this era, why is Edelbrock marketing this intake and not specifing "round or square"? thanks for listening to my rant/question..

 

[POORBOYK5]

Disreguard! after a little closer look at mine... I've realized that someone has "ported" this intake out to work on a square port head...... I can't win!

 

[toomany]

When you say "little ports, oval" do you mean regular oval ports or peanut ports? What are the casting numbers on the heads?

The rectangle port heads are for higher rpm power. They were never factory installed on a truck motor.

Usually Edelbrock has an "O" or "R" in the manifold part # or name..."Performer RPM O" would have oval ports. "Performer RPM R" would have rectangles.

 

[POORBOYK5]

14092360 which I searched and found to be described as oval ports. Are these referred to as peanut port as well? And are rectangular referred to as square by some? or are there 123241651861 styles of ports on these?

 

[fmstruck]

I did a little research and found that those heads are peanut ports. They are great truck heads but will be done breathing at around 4500rpm. If your manifold is an Edelbrock 3764, then it originally was made for those heads. Since you're using the TBI, those heads should work fine. I would Ebay the manifold you have and buy a new, unadulterated one, though.