Thread: modifying a v8 su carb manifold

Originally Posted by defmec

being the cheap skate i am i dont want to fork out $500 for a 4bbl manifold so i might try to cut the rise of a standard intake and weld on 1 inch 4bbl spacer to make a 4 bbl intake .i need it to run a 425 impco.has anyone done this before

I milled down a manifold and bolted on a 2brl holley adapter, you could bolt on a 4 to 2brl adapter instead. To make a decent 4rbl manifold out of the stock one will require cutting into the coolant passages to open up the plenum and rewelding them up .

would u have any fotos of your conversion please any info would be appreciated

I have a manifold that was modified for a 2 barrel holley that I then tried to add adaptor plates to take a Rochestor Qjet. I dont need it anymore (not sure it was going to work that well anyway). Its yours if you want it to experiment with.

Originally Posted by defmec

would u have any fotos of your conversion please any info would be appreciated

I had a look but dont have any photo's of any detail only the finished manifold with carb and lpg mixer attached. But this one of a 4.4 with 450 holley is similar to what i did.

mate adapting two to four will be bad for flow and the result will be poor mixture, just save up and buy the correct manifold that way you will end up with good results that you will be happy with and won't be a waist off time.