454 manifold suggestions
 

I would appreciate any suggestions on intake manifolds. It will be for a 454, large rectangular port chevy heads, mild roller cam, Holley carb, MSD ignition and dana exhausts. The max I would spin is 5000-5200 rpm. It's been suggested that I keep the stock but I find it hard to belive that an aftermarket wouldn't give me a little more torque/HP.

Please clear the smoke and break the mirrors! I need to buy one soon.

Re: 454 manifold suggestions
 

Team G duel plane> Great set up for your combo.

Re: 454 manifold suggestions
 

Pardon my ignorance but who makes the Team G, where is it available and is there a part#

Re: 454 manifold suggestions
 

Edelbrock air gap rpm or Victor Jr dart is also a good choice I took off the stock intake and carb on a merc 400 put on victor jr and 830 holley and picked up 3mph thought that was good bang for the buck but the boat already had exhaust on it.

Re: 454 manifold suggestions
 

Weiand makes the Team G manifold.
http://www.holley.com/weiand/

Re: 454 manifold suggestions
 

Do you have the stock alum High rise 454 mag intake or the 330hp intake?
I was going thru the same thig this winter. From others that have been there I decided to stay with my 454 Mag intake and use a 1" spacer. A friend with the same setup as me said he changed to a Victor and gained 25 rpm on top, but hurt his midrange.

The stock 454 Mag intake looks an aweful lot like a Weiand Team G dual plane. Although it is a Winters intake the same that was used on the LS6 454 from GM.

Like this Weiand 7535, It doesn't seem to be in the current catalog.
http://cgi.ebay.com/ebaymotors/ws/eB...950166119&rd=1

Re: 454 manifold suggestions
 

Since you want a mild 454, I would go with an Air Gap RPM. For a higher revving 454, I would use a Wiend Accellerator. Merc used them on the 420 HP with a 1" thick 4 hole spacerand a Holley 800. For an all out 454 that might rev to 6000, I would use the same Dart single plane that is used on the 500 HP.

Re: 454 manifold suggestions
 

Edelbrock Air Gap part number 7562 for square ports.

Chris

Re: 454 manifold suggestions
 

I agree with some of the other guys, I would go with the Edlebrock Air-Gap dual plane intake manifold....especially with it being a 454 with rectangle port heads which are too large in my opinion to begin with for a 454cid marine engine. It's not written in stone---but that's the route I would go. Have fun! :D

Re: 454 manifold suggestions
 

Payton, the existing manifold is not a high rise. The motor is an omc although I'm sure the manifold is a chevy part; probably the same as the merc 330 hp intake.

For the rest of you the compression is a 8.8:1 but will come out to almost 9:1 when the build is over. I would love to give you the cam specs but it is a custom grind retro fit hydraulic roller cam from the engine builder. All I can tell you is that the cam is mild enough that I will have no reversion problems with my captains call.

The builder estimates the power will be 450-480 hp when all is said and done. He is recommending a merc intake but I wanted an idea if I could do a little better with an aftermarket part.