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Cam Question

  1. #1
    Member Romper Stomper's Avatar
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    Default Cam Question

    Ok, I'm building a BBF and I'm not sure what cam I should run. The motor is going in a cvx 20 so it probably is gonna need torque more than horsepower. What I got going on so far- 460 with stock bore, d0ve-c heads fully ported and polished, 10.2:1 CR, torker intake, Holley HP 830 Carb, msd box and coil, roller rockers. I'm thinking about a comp cams CL34-337-4. Is this too much? Would I be asking for reversion with a cam this big? Thanks in advance for any advice.

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  3. #2
    www.highflowdynamics.com LakesOnly's Avatar
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    Cool

    Based on the info provided the camshaft is completely wrong for your engine and its application. It will certainly run (if the heads are set up in the valve train area for such a camshaft), and it may make some nice peak power numbers on a dynomometer when viewed by those none-the-wiser.

    In your boat, well, there are far better choices in shelf camshaft profiles. Something smaller, and something with a split duration favoring the exhaust given your presumed thru-transom exhuast on that CVX20. Without knowing the nitty-gritty details of the overall engine package and vessel, somewhere around a Lunati 61603 or 61604. And don't worry as much about reversion with your thru-transom exhaust (compared to water-injected headers). By the way, be sure to check port match on the transom logs at the cylinder head mating flange.

    LO
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    Performance Components for the 429/460 Engine Family


    This post © Copyright 2007-2017 Paul Kane. No copying, linking, printing or otherwise without express written permission.

  4. #3
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    "Ported" BBF heads vary quite a bit in flow numbers. To properly cam this thing you need to know what these numbers are.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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  6. #4
    Junior Member Ed Kimbrough's Avatar
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    Default 79 cvx 20

    I think you're the guy that I bought my place diverter from. I am in Fort Worth and was restoring my 1979 CVX 20. Your boat will get over 72 mph if you check the hull for a hook and do at least as much as I did with my 460 which I believe spits out about 500 hp at 4900 RPM with a AA pump impeller. My new A impeller caused the engine to spin over 6200 RPM at 65 mph. The hull has a slight hook which I'm going to take out soon with some fairing compound. I've been rebuilding this boat for about 10 years. I completed it last year but the water feed hose busted and it got hot enough to ruin some pistons. I'm rebuilding it again with the only difference being the new pistons, new oil pump, new head bolts, new main studs and machine work. I also got tired of the old-style starter and bought a high torque from CP performance. There links to videos at the bottom. Here is my engine parts and machine work list: XM278H K34-241-5 CompCams Kit 34-241-5 - Xtreme Marineâ„¢ Hydraulic Flat Tappet Camshafts 1 pair of C8VEE heads new guides CNC ported by Red Man one set of Ferrea 1.76 exh valves one set of Ferrea 2.19 intake valves One set of exhaust seats ARP Guide plates ARP 7/16 studs Roller rockers BB FORD PROCOMP T6 ALUMINUM ROLLER ROCKERS 351C 429 460 Smith Bros, Restricted push rods Ford Racing Tall valve covers VC cover stud kit ARP 400-7614 stainless 12 point Arp intake bolts 10/10 crank All bearings Clevite Armondo 10 Qt. oil pan With rear sump oil pickup Melling M84DHV High Volume oil pump ARP HP oil pump shaft New dizzy gear and pin ARP rod studs Ford truck rods D6VE-AA SLP-H418CP40 sealed power hyperutectic .040 pistons Block bored .030 over stock /decked .029" Oil drain back holes added or enlarged Dizzy gear oil modification ARP HP oil pump drive shaft Performer RPM Intake Port matched to the heads 1” Carb spacer Holley marine 850CFM double pumper #80443 Jets #88 Front #96 Rear 2 Power valves 6.5 front squirter .31 rear squirter .50 https://www.dropbox.com/s/e3h1do4u0rlxqan/MOV046.MOD https://www.dropbox.com/s/frk2h97xbfxwm0c/MOV047.MOD https://www.dropbox.com/s/oeg85swj7ub25c1/MOV048.MOD https://www.dropbox.com/lightbox/hom.../boat%20engine https://www.dropbox.com/sc/mu3uq7ir6esnlov/ElEoZtDy1Q https://www.dropbox.com/sc/k7v148il67o6vyb/E8qoJeT6TY

  7. #5
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    I just cammed a BBF with a set of ported D0VE heads the other day, the duration at .050 was 251/279 .050".
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    Default

    I did a 429 .030 over with DOVE-C heads by Wes King, 10.5 comp., Weiand with holley 660's, vertex, mech. roller from Oregon Cam's 236/242 ex @ .050, lobe lift .376/.380 ex, gross w/1.73 rockers .6504/.6574, lobe sep. 110*, installed @ 106* intake- 114* exhaust.................... engine produced 550 hp/435 fpt @ 6500 rpm, through Basset headers/mufflers.

    Hope this helps, good luck on your build!
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  9. #7
    Senior Member Smallblocksperry's Avatar
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    Default

    Quote Originally Posted by cstraub View Post
    I just cammed a BBF with a set of ported D0VE heads the other day, the duration at .050 was 251/279 .050".

    28 degree split

    must know something everyone else doesnt, maybe thats why your cams cost so much more

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    Quote Originally Posted by Smallblocksperry View Post
    28 degree split

    must know something everyone else doesnt, maybe thats why your cams cost so much more

    maybe he found out that the exhaust port needs some serious help

  11. #9
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    Quote Originally Posted by Romper Stomper View Post
    Ok, I'm building a BBF and I'm not sure what cam I should run. The motor is going in a cvx 20 so it probably is gonna need torque more than horsepower. What I got going on so far- 460 with stock bore, d0ve-c heads fully ported and polished, 10.2:1 CR, torker intake, Holley HP 830 Carb, msd box and coil, roller rockers. I'm thinking about a comp cams CL34-337-4. Is this too much? Would I be asking for reversion with a cam this big? Thanks in advance for any advice.
    are you set on running your intake seems to me that you could run a taller style intake so that the port transition isn't so extreme, im not a ford guy but i know the torker isn't always the best choice if you have room to go with a nicer manifold

  12. #10
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    Quote Originally Posted by Smallblocksperry View Post
    28 degree split

    must know something everyone else doesnt, maybe thats why your cams cost so much more
    OEM headed 500incher I did a couple of years back with ported OEM castings made 906HP. That cam was not normal either.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

  13. #11
    Dead Member Hyperpasta's Avatar
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    Quote Originally Posted by cstraub View Post
    OEM headed 500incher I did a couple of years back with ported OEM castings made 906HP. That cam was not normal either.
    Chris, Stock OEM Block too?

  14. #12
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    Yes stock block. Truck puller in OH.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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