The Stovebolt Site Forums The Shop Area Engine Shop Squarebore carb onto spreadbore manifold

What's the word on putting a squarebore carb onto a spreadbore manifold. I see more of a problem going the other way, but in the Summit catalog I did see an adaptor that is available and it seemed a bit expensive for what it is. Is it really necessary as long as the base gasket covers the entire opening in the manifold?
I have an Edelbrock Performer manifold which has a dual bolt pattern, so that shouldn't be an issue.

Aaron

I could be wrong, but I think the dual bolt pattern is so you can use either a Quadrajet, or a spreadbore Holley on that intake.

You might be able to put the squarebore carb on that spreadbore intake, but I'm pretty sure you'll have to tune for strange fuel delivery problems. The adapter plate would work, but check your hood clearance.

What engine, cam, heads, tranny, rear end? What vehicle is this in?

chip

Right now I am running a '69 307 with '65 283/327 Power Pak heads, Edelbrock Performer intake, Quadrajet, and a stock cam as far as I know for now. I have a '72 TH350 behind it with the stock 4.11 rearend in my '65 3/4 ton. The plan is to get a 350 block and some 327 pistons and drop my 307 crank in and make a 327. I was going to use my heads and intake on the new engine, but get a new Edelbrock or Holley carb. Then get a nice cam to put in it. My Quadrajet is halfway decent, I've put a rebuild kit in it and done a little tuning, but it's a mid-70's one and isn't really the best one for my purposes. I have no problem buying a new intake if I have to, I just thought I would use the one I already have if I could. If this is the case I will probably get the Performer RPM intake.

Aaron

According to Edelbrock (I hope that is the manifold you are using), a square-bore Edelbrock Performer carb does not need an adapter plate. If you use a Holley carb (or other square bore), the adapter plate is required.

Thanks for the info guys. I have been pouring over Summit and Jegs looking at all of the stuff I will need to put this engine together. I can't wait until I have the money to start.

Aaron