Can i run a Holley 80457 on a spreadbore Mani?

[JackOc]

Hi I have a 74 scout ii with a brand new 79 motor with a spreadbore manifold. I just ran into and became the new owner of a BEAUTIFUL brand new Holley 80457sa carb I would like to use. ANY CHANCE? I read here it is the perfect carb for the squarebore manifold....mounting flange is definately wrong

What would you guys do?

BTW motor is out of scout, in longblock + intake condition, building now, im open to swapping for a squarebore if its a good idea....just have to locate one or trade mine for one or something

What would be the best option besides the Carter thermoquad (not a fan )


Thanks
Jack

[jeff campbell]

get a adapter for it.most parts stores have them.jeff

[sdowney717]

I made one out of good multi-veneered ( many layers) plywood.
Mine took a spead bore and went to a square bore with a large central opening, not multiholed. If your handy it can be done. This plywood I used was almost an inch thick, not a cheap 3/4 3 layerd plywood, more like furniture grade solid core, birch plywood. I put some fuel resistant epoxy on it.

I ran long studs up out of the manifold and use quadrajet carb. Leaving studs in manifold, just attach carb with washers and nuts.
It has worked very well. The plywood surface acts like its own gasket surface.
I strongly suggest your adaptor be wood or phenolic not aluminum. With
today's gas, you dont want to overheat the carb, all the gas will boil out of it.
And you get hot start heat soak issues.

[JackOc]

WOW cant believe it i was at the Pomona Antique car swap meet today and KABLAM there was the adapter I needed Spread to square for 10 bucks !!