Headers Vs. HP Manifolds
08-20-2006 | 04:57 PM
#21
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Joined: Nov 2004
Posts: 14,100
Likes: 3,687
From: On A Dirt Floor
Re: Headers Vs. HP Manifolds
Originally Posted by bghert
I am not looking for a big gain but just a little better performance out of the hole. I have a 26' Envision open bow and it is very sluggish when full of people and coolers.
Also, if you do not have trim tabs, adding them will help out tremendously with 'out of the hole' accelration.
08-20-2006 | 06:59 PM
#22
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Joined: May 2002
Posts: 589
Likes: 0
From: Rochester, NY
Re: Headers Vs. HP Manifolds
I just put (2)pair of Stainless Marine manifolds on my 502 MPI's. Nice quality product with a relatively clean install. Definitely notice a feel in the mid-range, but haven't bothered to see if any gain up top.
Not the cheapest on the market, but I thought it was the best value for what you were buying. Trick Marine had excellent pricing on them earlier this year.
Not the cheapest on the market, but I thought it was the best value for what you were buying. Trick Marine had excellent pricing on them earlier this year.
08-22-2006 | 10:43 PM
#23
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Joined: Jun 2004
Posts: 476
Likes: 0
From: Wichita, KS
Re: Headers Vs. HP Manifolds
I re-did my 1989 330hp 454 last winter. Here is the details - link my summary
End result is I went from being able to only pull 4,100rpm with a full tank and 5 passengers to pulling 4,800rpm. I still have yet to do my prop testing to see how much I can bigger I can go.
Let me now if you want any more detailed information about my build. I did the whole thing for under $1,000 - not bad for +700rpm!
End result is I went from being able to only pull 4,100rpm with a full tank and 5 passengers to pulling 4,800rpm. I still have yet to do my prop testing to see how much I can bigger I can go.
Let me now if you want any more detailed information about my build. I did the whole thing for under $1,000 - not bad for +700rpm!
