Mild 454 build
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Mild 454 build

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    Default Mild 454 build

    What's a good flat tappet Hyd cam to run in a mild build flat top piston engine.Want a nice chop,And need my power from 1500 to about 4000 rpm.Just mainly a steady cruise around 3400,larger (38') Stinger.Don't want a roller cam.Single carb.Not a race boat.Thanks JOHN SR

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by fenderjack View Post
    What's a good flat tappet Hyd cam to run in a mild build flat top piston engine.Want a nice chop,And need my power from 1500 to about 4000 rpm.Just mainly a steady cruise around 3400,larger (38') Stinger.Don't want a roller cam.Single carb.Not a race boat.Thanks JOHN SR
    Need to know more about the boat, and specifics on the engine, heads, induction, I assume pump gas. 38' boat has twin engines, right? What type exhaust?

    Flat tappet is fine, just make sure you run the proper oil or use ZDDP additive.

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    steelcomp was here
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    Quote Originally Posted by fenderjack View Post
    What's a good flat tappet Hyd cam to run in a mild build flat top piston engine.Want a nice chop,And need my power from 1500 to about 4000 rpm.Just mainly a steady cruise around 3400,larger (38') Stinger.Don't want a roller cam.Single carb.Not a race boat.Thanks JOHN SR
    No such thing as a good flat tappet cam any more.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Quote Originally Posted by scott foxwell View Post
    No such thing as a good flat tappet cam any more.
    Afraid I would have to debate that point, never have lost one in one of my engines.

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    Urban Cougar Trapper Gopher711's Avatar
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    Hyd Roller would be pretty much the ideal cam choice now

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    Default cams

    Should of Known not to ask the question.Just wanted something more than a stock for a mild build

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    Or Seth, either one Budweiser's Avatar
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    Let me tell ya... if it were me in your shoes I'd choose a Summit "house" or generic grind with an advertised RPM range close to what you're looking for. I've used one a few years ago without any issue with the cam for 20 or so hard driven hours before other non-cam related issues took the engine out.

    I think they're like $100 with lifters, or something like that. Maybe more now, but super budget for something that's not intended for full tilt boogie...

    Anyway, just what I'd do. You already heard from the pro's...

    Good luck
    Last edited by Budweiser; 01-22-2016 at 10:50 PM.

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    Or Seth, either one Budweiser's Avatar
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    Also, a 4000 RPM cam is not gonna have any chop at idle. That's basically a stock grind, or the smallest offered from any source. I'm the kinda guy that would rather have the part function well over having it sound good. Look for something rated in the 6500 range if you want the idle to sound "good", but you'll pay a price in overall performance of the boat. Also, make sure the profile will work with your exhaust system. Too much overlap will suck water into the cylinders. Before you purchase, toss the specs up here. obnoxious001, among others, will be able to give it a thumbs up/down. May be best to send him a PM anyway.
    Last edited by Budweiser; 01-22-2016 at 10:52 PM.

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    Default Cam for a mild build

    Any thoughts on this cam Crane #13251 This is a stock merc 420 HP cam. Basic Operating RPM Range: 2,800-5,800
    Intake Duration at 050 inch Lift: 228

    Exhaust Duration at 050 inch Lift: 236
    Duration at 050 inch Lift: 228 int./236 exh.
    Advertised Intake Duration: 298
    Advertised Exhaust Duration: 306
    Advertised Duration: 298 int./306 exh.

    Intake Valve Lift with Factory Rocker Arm Ratio: 0.530 in.
    Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.551 in.
    Lobe separation 114

  12. #10
    Senior Member A handfull's Avatar
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    Default .533"-282dur-108lsa Crane hydflat tappet. Listen in video here.

    https://youtu.be/NFgHYpO9Gtk

    This is a 454 .060" bore, small dome keith black hyp piston. 781 heads 2.19/1.88 9/1 compression. Picked this .533"-282 dur-108 lsa crane hyd flat tappet. Sounded good..slight thump in the idle...made good cylinder pressure and the motor was LOUD. I went with a tall aluminum older Weiand dual plane intake and a 750DP Holley. Reved quick and had gobs of torque.(no reversion problems with wet exhausts either)

    The boat flat out screamed. Completely amazed on how quick and fast this boat was. Even full of people the boat honestly ran like a raped ape. (75 mph plus, somehow I couldn't believe it myself and it planed with no effort) Going with this smaller cam focused the motor'power band right where it needed to be.

    I would use this combo over and over again on a fairly big heavy offshore style of hull, If I were on a budget and didn't spend the $ on a roller cam, this engine is cheap and works.

    The Procharger motor shown at end of video was not in this boat. Totally different deal.


    Click image for larger version. 

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    Last edited by A handfull; 01-26-2016 at 11:45 PM.

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    Default 454 build

    Here is what I came up with.454 .010 off deck to make flat.Flat top pistons. 100 cc vortex heads stock GM big oval ports not peanut port .9.3 compression .Short block is together.Elderbrock air gap intake.The cam I am thinking is a Isky 270/280 Mega Cam.What you think??? So many ways and suggestions and great info from all of you .Nothing in stone except for short block I just picked this combo what you think????

  14. #12
    ptc
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    Quote Originally Posted by scott foxwell View Post
    No such thing as a good flat tappet "Hydraulic" cam any more.

    Ok ..... thats helpful!!! How about mediocre ????
    1975 Sanger True Flat - 496 BBC
    http://v-drivecalifornia.blogspot.com/

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    ptc
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    Ive got this cam and lifter set that has just a few hours on it. make ya a killer deal on it. should work nicely in a cruiser boat.


    GM HO 502 Stock cam Specs:
    Camshaft Type (P/N 24502611): Hydraulic roller
    Camshaft Lift (in.): .510 intake / .540 exhaust
    Camshaft Duration (@.050 in.): 211° intake / 230° exhaust




    1975 Sanger True Flat - 496 BBC
    http://v-drivecalifornia.blogspot.com/

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    Default Cam

    Need two cams .And if I got yours would still have to pay full price on another.I can buy two new Flat tappets and lifters for 480.00 .To some money does not hold them back but I need to watch mine,I know if ya have a boat don't ask the price but I must. Thanks anyhow. JOHN SR

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