454 mercruiser 330hp intake, carb, cam
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454 mercruiser 330hp intake, carb, cam

  1. #1
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    Default 454 mercruiser 330hp intake, carb, cam

    I am looking for some advice for an intake, cam, and carb for a 1995 baja 240 mercruiser 454. My boat tops out around 60mph and I want to do some upgrades to get that speed up. Exhaust has already been upgraded. I was told I had peanut port heads and may not have a roller cam. Can someone help me on what type of cam I have and how to make some power out of this motor. I normally spin 55-60 mph at about 4800 rpm. Thanks in advance.

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    gn7
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    You do not have roller cam, it is a hydraulic flat tappet and it most likely has peanut port heads.

    How much you hoping to gain in speed and how much you willing to speed.

    for any real HP gain you will need to change the heads, cam and valve train to match and the intake manifold. Assuming your exhaust upgrade is up to the job.



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    Bass Lake Dream'n "Flat" foot'n's Avatar
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    I did exhaust and a edelbrock performer intake on a 330hp 454 in my 21 Vector. I noticed no change in performance. I wasn't expecting any without head and cam changes. I needed to change the stock ones out, they were all in bad shape. Would like to put 049's and a edelbrock performer cam.
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    These are some heads that I was thinking about

    http://item.mobileweb.ebay.com/viewi...id=34096689757

    i am wanting to spend no more then 1500. I would like to see 70mph

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    I've got a hyd roller that I developed for a customer up for these engines and stock mercury exhaust. With intake manifold and cam change average was about 4mph.

    On a side note. I had a 240 sport and at 70MPH they can get quite interesting to drive.
    Chris Straub
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    Quote Originally Posted by 6string View Post
    These are some heads that I was thinking about

    http://item.mobileweb.ebay.com/viewi...id=34096689757

    i am wanting to spend no more then 1500. I would like to see 70mph
    345cc heads are WAY to big for a 454 turning less that 6000 rpm. It would be a dog with those heads.
    Chris Straub
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    Quote Originally Posted by cstraub View Post
    345cc heads are WAY to big for a 454 turning less that 6000 rpm. It would be a dog with those heads.
    X2 ..... WAY TO BIG.... would make it a pig indeed.

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    Or Seth, either one Budweiser's Avatar
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    Quote Originally Posted by 6string View Post
    I am looking for some advice for an intake, cam, and carb for a 1995 baja 240 mercruiser 454. My boat tops out around 60mph and I want to do some upgrades to get that speed up. Exhaust has already been upgraded. I was told I had peanut port heads and may not have a roller cam. Can someone help me on what type of cam I have and how to make some power out of this motor. I normally spin 55-60 mph at about 4800 rpm. Thanks in advance.
    Better ways to do it, but on a tight budget... here's my two cents worth.

    Keep your carb, buy a tuning kit, read up on it, learn how it works. I assume it's a Quadrajet... not a bad carburetor by any means, just less understood... $140
    Edelbrock Performer (not Performer RPM), for oval port heads and appropriate carburetor flange... $220
    Summit Cam and Lifter kit #K1301...$100
    Recommended springs for cam above...$90
    Timing chain and gears... $35
    Roller rockers... $250

    Buy a used set of 049 cylinder heads (some for sale here: http://www.performanceboats.com/parts-sale... ) $100-250... and drop them off at a reputable machine shop with your new springs. Cost will vary depending what needs to be done to them or parts that may need replacing.

    Gaskets, lubes, and incidentals... $300-$500

    Depending what second hand parts you're able to source, that should put you right around your budgeted $1500 and put you in the 400(ish)HP range.

    Have you had a chance to play with the trim yet?
    Last edited by Budweiser; 04-24-2013 at 08:56 AM.

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