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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   454 manifold suggestions (https://www.offshoreonly.com/forums/general-q/95321-454-manifold-suggestions.html)

Pat McPherson 01-28-2005 01:38 PM
Re: 454 manifold suggestions
 
I have a Chevy 454/502HO high rise dual plane aluminum intake never used.
It came off of a 425HP/454HO crate engine that had a blower bolted on to it.
$50 it's yours...

fred 01-28-2005 02:15 PM
Re: 454 manifold suggestions
 
I run the air-gaps with 750cfm Demon carbs on my 454/400 Cyclones.....great results.....Fred

Madmax 01-28-2005 02:19 PM
Re: 454 manifold suggestions
 
Edelbrock RPM Air Gap.......great intake.......

altho that $50 intake would be an excellent choice performance AND budget-wise..... Prob would see more than 10hp difference between it, and the Edelbrock.

Madmax 01-28-2005 02:20 PM
Re: 454 manifold suggestions
 
whoops, meant to say WOULDNT see more than 10 hp difference between it and the Edelbrock....

RLW 01-28-2005 02:25 PM
Re: 454 manifold suggestions
 
Pat,
You have an email.
Russ

Pat McPherson 01-28-2005 03:01 PM
Re: 454 manifold suggestions
 
Russ,
I'm at work now and my e-mail address is set to my home.
I'll get back to you this weekend...

Panther 01-28-2005 03:43 PM
Re: 454 manifold suggestions
 
Originally Posted by Hostile Takeover
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.
I've seen good results with the Merc Daul Plane Intake Manifold with a spacer. With the Cubic inches you are running and the RPM range you've indicated I really don't feel you need a single plane intake. Also, the dual plane intake builds a little more torque down low where you need it. In some cases, I've even seen some HP 500 motors make more power with the dual plane. A good friend is running the merc dual plane on his 540's and the motor makes lots of torque and you don't need to rev the piss out of it, the dyno numbers proved it.

Panther 01-28-2005 03:44 PM
Re: 454 manifold suggestions
 
Merc Manifold also has brass inserts for corrosion.

Hostile Takeover 01-28-2005 05:56 PM
Re: 454 manifold suggestions
 
PAT, If that is the merc manifold w/brass inserts I would love to buy it from you. Please give me a phone number or e-mail me at [email protected]

Thanks

Rookie 01-28-2005 08:18 PM
Re: 454 manifold suggestions
 
Just out of curiosity. What if you ran the single plane with oval ports into the rectangle heads? Would you be able to get better velocity with the initial volume of the oval port intake?
not an expert at any of this intake-head "VOODOO-black magic" just curious


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