Is this a good cam for my 521
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Is this a good cam for my 521

  1. #1

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    Default Is this a good cam for my 521

    My build is a 521 ford with Performer RPM heads (60669),Harland sharp roller rockers, Performer RPM intake, 9 to 1 compression, Marine 850 Holley, exhaust is logs with snails exiting under water,Berkely JE pump have A & AA impellers. want max RPM to be around 5000 to 5500. The boat is 20' long.

    Comp cam- Hyd. roller 111 intake center line, Dur @ 50, 244 intake, 250 exhaust, 113 lobe sep.,605 intake lift, 622 exhaust lift. Custom gride


    Crane- Hyd. roller
    226 intake, 230 exhaust, 112 lobe sep.,522 intake lift, 530 exhaust lift.

    These are the cams that Comp and Crane suggested.
    What do you guys think. Thanks
    engine

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  3. #2
    jetboataholic HawaiianJet's Avatar
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    I would suggest posting this in the "On the Dyno" section as well. Might get a better response out of the engine builders that hang out over there. You'll get some response here, but you might do better over there.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  4. #3
    cj812 ralph brunt's Avatar
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    ditch the hyd roller too much hassle for a ford

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    Senior Member jetboatperformance's Avatar
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    If your screen name is reflective of your boat (CVX 20) ,your at the upper limits of duration at 50* for log maniflolds on the Comp and could run the risk of "reversion" IMO Tom

    Check out this flat tappet Xtreme marine Comp 34-241-5 or this 34-236-4
    Last edited by jetboatperformance; 05-03-2008 at 09:02 PM.

  7. #5
    Senior Member ol guy's Avatar
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    Quote Originally Posted by CVX20Dustin View Post
    My build is a 521 ford with Performer RPM heads (60669),Harland sharp roller rockers, Performer RPM intake, 9 to 1 compression, Marine 850 Holley, exhaust is logs with snails exiting under water,Berkely JE pump have A & AA impellers. want max RPM to be around 5000 to 5500. The boat is 20' long.

    Comp cam- Hyd. roller 111 intake center line, Dur @ 50, 244 intake, 250 exhaust, 113 lobe sep.,605 intake lift, 622 exhaust lift. Custom gride


    Crane- Hyd. roller
    226 intake, 230 exhaust, 112 lobe sep.,522 intake lift, 530 exhaust lift.

    These are the cams that Comp and Crane suggested.
    What do you guys think. Thanks
    engine
    With-out a doubt the crane cam would be the best bet. Alot of people tend to overcam thinking bigger is better. M

  8. #6
    "It's HONDO, honey" Kyle's Avatar
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    Quote Originally Posted by CVX20Dustin View Post
    My build is a 521 ford with Performer RPM heads (60669),Harland sharp roller rockers, Performer RPM intake, 9 to 1 compression, Marine 850 Holley, exhaust is logs with snails exiting under water,Berkely JE pump have A & AA impellers. want max RPM to be around 5000 to 5500. The boat is 20' long.

    Comp cam- Hyd. roller 111 intake center line, Dur @ 50, 244 intake, 250 exhaust, 113 lobe sep.,605 intake lift, 622 exhaust lift. Custom gride


    Crane- Hyd. roller
    226 intake, 230 exhaust, 112 lobe sep.,522 intake lift, 530 exhaust lift.

    These are the cams that Comp and Crane suggested.
    What do you guys think. Thanks
    engine
    Sounds like a good cam. Having a cutom grind is always cool because it makes it even more one of a kind. Sometimes it is hit or miss. The exhaust seems a little big considering your running logs you might get a gulp of water like JBP. And if your running a 521 I would go for roller rockers or at least a flat tappet; and a roller cam. The snap they have is so nice. Insant RPM...Instantly back to that "business sound" idle

  9. #7
    Glendale Arizona Squirtcha?'s Avatar
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    Quote Originally Posted by ralph brunt View Post
    ditch the hyd roller too much hassle for a ford
    Can you elaborate Ralph? Reason I ask is I was considering going with a hyd roller in my next mill. It will be a 532 BBF.

  10. #8
    cj812 ralph brunt's Avatar
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    Quote Originally Posted by Squirtcha? View Post
    Can you elaborate Ralph? Reason I ask is I was considering going with a hyd roller in my next mill. It will be a 532 BBF.
    the lifters are longer wich screws with the geomotry (sp?) so you will need custom push rods. the push rod holes will have to be ground on so the push rod clears the head. not saying it cant be done,"because it can" .02

  11. #9
    cj812 ralph brunt's Avatar
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    get a hold of chris straub and have him spec a cam, that will take all the guess work out of it. Yes it will cost a little more but he will give you a cam that is for YOUR motor. Not some cam that came out of a book....

  12. #10
    JRPM/e-PerformanceMarine Squirtin Thunder's Avatar
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    If you are thinking of going hyd roller you are looking at about $500 more in custom machine work or custom off-set lifters as well as having someone that really truely knows how to set-up the geometry correctly.Cust length push-rods are a given with any performance type cam. It is alot of hastle for not much gain, I mean the only true gain will be no cam break-in. I run a flat tappet hyd cam and Ralph runs a solid roller we are the only two in the Comp Jet Class that has not broke on the course. We pull info from guys on these boards such as Steelcomp, Chris Straub, LakesOnly, DSC, Jim Brock & Timminator. Do your home-work before you buy !
    Jim & Amanda Rich
    CJ 72 & 53c

    JR Performance Motorsports

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