BB Edelbrock Heads/ Manifold
Thread Starter
Racer
Joined: May 2003
Posts: 406
Likes: 5
From: Miami FL
BB Edelbrock Heads/ Manifold
I have a 427 BB with a set of Edelbrock Performer heads and by mistake I purchase a new Edelbrock Performer RPM Air Gap Manifold for it instead of the Performer Manifold. Do you guys feel that installing the RPM manifold on the Performer heads will be a problem? The rectangular ports on the manifold seems much taller that the ones on the head. I will really appreciate any help and information... Thank You.
Race Director
Joined: Jan 2000
Posts: 13,015
Likes: 2,260
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
There are two RPM Air gaps..one for rectangular port heads and one for oval ports..or more appropriately "squovals" or 'rectovals"..as the Edelbrock ovals are sort of a cross between the two.
You can still use the airgap design, but you need the one that matches the heads. Also I hope you have good hood clearance as the Air Gap is pretty tall.
BTW- If you can get it under the hood, the Air Gap is a great intake.
JIM
You can still use the airgap design, but you need the one that matches the heads. Also I hope you have good hood clearance as the Air Gap is pretty tall.
BTW- If you can get it under the hood, the Air Gap is a great intake.
JIM
Thread Starter
Racer
Joined: May 2003
Posts: 406
Likes: 5
From: Miami FL
Jim, thanks for your input.
I did some more research and it gets worst, the heads are Edelbrock 60499 heads which are Oval ports TBI heads, and neither the square, nor the oval ports manifold seems to match... I'm really at a loss here. Any help will reallllllllly be appreciated.
I did some more research and it gets worst, the heads are Edelbrock 60499 heads which are Oval ports TBI heads, and neither the square, nor the oval ports manifold seems to match... I'm really at a loss here. Any help will reallllllllly be appreciated.
Race Director
Joined: Jan 2000
Posts: 13,015
Likes: 2,260
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
You have the "squovals". They are a square looking oval port.
Good heads.
The Air Gap is modeled after the old style ovals I'm sure, but a little ginder work will help out.
So do you have a rectangular intake for old style rectangular port heads? Or is it an oval one that just seems a little weird looking for your heads?
JIM
Good heads.
The Air Gap is modeled after the old style ovals I'm sure, but a little ginder work will help out.
So do you have a rectangular intake for old style rectangular port heads? Or is it an oval one that just seems a little weird looking for your heads?
JIM
Thread Starter
Racer
Joined: May 2003
Posts: 406
Likes: 5
From: Miami FL
Jim, I had the oval port RPM manifold, but since the head ports looked to me like rectangular ports I exchanged it for the RPM rectangular ports. (I should had verify the head part numbers before) The good thing is I can change the manifold back to a oval port type, the ports still wont match, but the will be closer, and you are correct nothing that a bit of grinding wont fix. Do you know what the difference between a TBI head and a standard type is??
Race Director
Joined: Jan 2000
Posts: 13,015
Likes: 2,260
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
Yes, just go back to the other intake. You'll be fine.
The TBI heads are the same as the regular ones, they are just milled to around 100cc chambers I believe. They do well on a flat top piston that you are trying to get some compression out of.
JIM
The TBI heads are the same as the regular ones, they are just milled to around 100cc chambers I believe. They do well on a flat top piston that you are trying to get some compression out of.
JIM
