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Thread: anyone know cam specs

  1. #1
    Dave C
    anyone know the cam specs or where to get them for the 496HO and HP500 or HP525???
    anyone? bueller?
    thanks!!

  2. #2
    MACHINEHEAD
    I know the hp500 cam is 220/230 @.050 and 560/580 lift 110 lobe sep.
    I believe the 525 is 224/234
    And I want to say the 496HO is like 218/226
    All have similar lift. Why do you ask?

  3. #3
    bigkatboat
    The Merc books show the basic specs. I just finished a 454 Mag MPI motor for a friend. It looks stock but it has a .250" crank, longer rods and 9.4 compression. I used what I thought was the early 'HP 500 cam' (hydralic flat tappet), Crane #H-228/312-2S-14 T1.2 . I needed a cam for EFI (good solid vacuum) Merc seems to use very mild stuff as far as cams go, I have never seen a Merc cam that had 110 lobe center. This motor is in a 22' Daytona, 1.50 gear, 28 pitch Ron Hill 4 blade, it hits the rev limiter and pulls like a train. Next time I will try this cam ground on 112 lobe centers, it does not need all of the low end power it makes. intake- 530, (298) 228 @ .050 exhaust- 550, (306) 236 @ .050 on 114, in at 112

  4. #4
    Dave C
    thanks
    I thought the 496HO had 510 lift?
    uummmmm lets just say I'm curious! :rollside:
    I know the hp500 cam is 220/230 @.050 and 560/580 lift 110 lobe sep.
    I believe the 525 is 224/234
    And I want to say the 496HO is like 218/226
    All have similar lift. Why do you ask?

  5. #5
    Beer-30
    HO cam is .300 lift. 1.7 (stock) rockers = .510 at the valve.
    Here is the HP500 cam:
    http://cranecams.com/index.php?show=...11&lvl=2&prt=5

  6. #6
    MACHINEHEAD
    After loosing a factory roller on a customers engine I had it re-ground by crane. the cam beer30 mentioned is what crane had re-ground it to. Crane had sent me a before and after grind sheet and confirmed my in shop measurements 220/230 560/580 and 110 lda. Twin fountain 38 saw no difference in rpm. If it matters these were hp500carb gen6 rollers. Have had a couple others apart, same cam. This doesnt mean there werent design changes though.I know for a fact you cannot exceed 560 intake lift on the new 496, piston to valve interference at 580!!

  7. #7
    Beer-30
    I know for a fact you cannot exceed 560 intake lift on the new 496, piston to valve interference at 580!!
    Gotta love the personal experience. That is what we all need, though. We can all speculate all day long.

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