Thread: square/rectangle port cast iorn big block chevrolet intake

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We are in need of in a bad way a square/rectangle port cast iorn big block chevrolet intake. if such a beast exists i have been told that they came out in 67 and 68 chevelles, i have also been told that there is a way that you can cut up an oval port intake and make it square. any help at all is much appreciated!

i have never seen a iron rec port intake.. all gm i seen were alum .i not saying they never did but if so its very rare.... you could do some work to a iron O port but why??? if you need it to be iron for a class just send out a alum intake and get it metal sprayed with steel

Pat thanks for the reply, tell me more about this metal spraying like how its done and price, allso who provides the service is it something i have to send off or something thats done localy? thanks

guys spray all types of metal s any shop that builds up shafts and plates etc that are hurt by rust. worn or over machined or to added a better metal on a part for wear .or rust look in the yellow pages under thermal spraying or metallizing i only seen it done one time. not to good to be around when its being put on.but i have had things done they use air a gass and wire that looks like a spray gun that use a electric charge the metal comes out like hot sparks.there is a shop here mi that will do the job

how can i cut up the round port to fit the square port heads?..... whe have just found out that thats our only option

You don't need to cut it up--just run it--you will just have some terrific anti reversion at the manifold--really helps with big cam, low rpm and too small exhaust

find a set of re worked O ports your never going to seal it up??????????????????? the O port intake is smaller then a stock rec port head less you do some welding on the O port intake and start cutting it out .i could make it work but you would not like the price

even if price wasnt an option i still need a stock appearing intake atleast from the top is there any way that i can put a thin shim in between the two to cover the square ports above the intake?

I don't remember exactly which manifold or heads it was but I did do one for a customer about 30 years ago that had the same type issues----it HAD TO BE THIS MANIFOLD---and it works---it probably was off one of the higher hp 396/427 at the time but it was cast iron and oval port

i done the rec port intake on the o ports heads with rec port gaskets .not realy sure there is that much iron around the o port to seal the top of the rec port heads? hard to say have to check with a rec port gasket up on the o port intake

Why does it have to be cast iron ? Can you use an GM aluminum intake.
BradC