[quintorca]

This is my first post guys. I am building a 1989 454 to drop into my boat. It has the round ( peanut ) port heads, and I'm wondering if an oval port intake would match up and fit without problems? Also, could I use the stock TB intake and bolt up a carb to it instead. I would rather go the new route with a better manifold if possible. I'm an old school guy I'm not a big fan of computers in engine management, just more things to break. All I need is air, fuel and spark to go, thats it. Thanks in advance for the help.

[techinspector1]

I'm no big block expert by a long shot, having built only one 454 in my life, but I'm pretty sure that any standard deck manifold will bolt to any standard deck block. The only issue I see is with the port size mis-match using the larger port manifold with the smaller port heads. The motor will run of course, but it would seem there will be a lot of turbulence at the manifold/head interface.

[Double_v23]

I agree, the manifold will bolt up and it will work but flow will be reduced. This may not that bad if you are doing low speed low rpm driving. The answer to all your problems is to purchase the appropriate manifold.

You will need an adapter or a new manifold to run a carb.

[speedydeedy]

I agree with the replies but If possible especially in a boat that will see a lot of high RPM I would get better heads to go with the better intake. Those peanut heads will kill the power on that engine.

[quintorca]

I'm looking for the low end torque which the engine has already stock, not looking for high rpm. I'm installing something close to a 2:1 ratio tranny also. I don't think there are too many companys making the peanut port intake manifolds.

[Studebaker]

I saw a peanut port intake manifold for carb use on Ebay. I cant remember who makes it. I think it may have been for boat application. You might check with Edelbrock, weiand or other manufacture websites, I imagine someone makes a manifold for the peanut port heads.

[troy norrad]

yes it will mate up but that torque you had, your going to lose some of it as the peanut ports are going to slow down the air pattern