750 cfm Holley carb question

[delta881972]

i have the opportunity to buy a new in the box holley for $50 cash. (its a 0-80508s) its a couple years old but never been out of its box.

my question is if it will fit on a stock 4bbl intake on a 72 olds 350? and will this be too much carb for my motor?


im gonna try to kill 2 birds with one stone here and would like to use the holley on my 350 while im taking my time with the 455 build ill be dropping in next fall. any thoughts about using it on the 455 after?

[hamm36]

I have a Holley 750 dual line, single pump on my 455 works fine for me. I would get it and save it of the BBO. On the performer intake you will need a plate and two gaskets, not sure about stock I never had one.

[joe_padavano]

Originally Posted by delta881972

my question is if it will fit on a stock 4bbl intake on a 72 olds 350?

That's a 4160 square bore carb. Your stock intake is a spread bore. The carb will not bolt up without an adapter. The adapter significantly disrupts flow and partly negates the benefit of the carb.

and will this be too much carb for my motor?

A stock 350? Yeah. The only good news is that it's a vacuum secondary carb, so at least it will only open as much as needed. It's a waste on that engine, but it's a good price if it's really brand new. On the other hand, depending on what you plan to do to the 455, it may or may not be right for that motor. I understand the problems of trying to build a car incrementally. Just be aware of the compromises you're making.