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Thread: Longest stroke in a Merlin block

  1. #1
    Junior Member APPRENTICE
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    Longest stroke in a Merlin block

    Just like it says. What is the longest stroke you can put in a merlin standard and tall deck?

  2. #2
    Senior Member RACING JUNKIE
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    4.375 in the 9.8 deck 4.75 in the 10.2" deck


    http://www.worldcastings.com/product...vrolet-blocks/

  3. #3
    Junior Member APPRENTICE
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    ok great... can a 632 be a wet sump?

  4. #4
    Senior Member MASTER BUILDER
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    You can actually put a 4.50 in a 9.8 deck but I wouldn't do it, Scott Shafiroff builds a 598 in a 9.8 deck block. Are you going with a block that has a raised cam?

  5. #5
    Senior Member RACING JUNKIE
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    Actually you an put a 4.625 in a 9.8 and make a 615 APD does it all the time
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  6. #6
    Senior Member MASTER BUILDER
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    Quote Originally Posted by hammertime
    Actually you an put a 4.625 in a 9.8 and make a 615 APD does it all the time
    That's why I asked about a raised cam block, BES does stuff like that also. APD does alot of testing on all kind of stuff, they had a real good article a couple of years ago on some Big Chief testing that they did. I don't think APD gets as much credit as they should.

  7. #7
    Senior Member RACING JUNKIE
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    Quote Originally Posted by michael1
    Quote Originally Posted by hammertime
    Actually you an put a 4.625 in a 9.8 and make a 615 APD does it all the time
    That's why I asked about a raised cam block, BES does stuff like that also. APD does alot of testing on all kind of stuff, they had a real good article a couple of years ago on some Big Chief testing that they did. I don't think APD gets as much credit as they should.
    Actually do not need a raised cam block. Mine is a 4.5 stroke in a 9.8 deck also.

    That article was the start of a major change in cam profiles, the engine was a good friend of mine, he purchased from a big name builder and put a terminator on it. It developed the mystery "alky miss" and did not run nearly as well as it should of. APD was close so John Kyle did a bunch of work and figured it out with a cam he designed. They also have designed some of the best bbc heads on the market.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  8. #8
    Senior Member SENIOR BUILDER
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    Quote Originally Posted by hammertime
    Quote Originally Posted by michael1
    Quote Originally Posted by hammertime
    Actually you an put a 4.625 in a 9.8 and make a 615 APD does it all the time
    That's why I asked about a raised cam block, BES does stuff like that also. APD does alot of testing on all kind of stuff, they had a real good article a couple of years ago on some Big Chief testing that they did. I don't think APD gets as much credit as they should.
    Actually do not need a raised cam block. Mine is a 4.5 stroke in a 9.8 deck also.

    That article was the start of a major change in cam profiles, the engine was a good friend of mine, he purchased from a big name builder and put a terminator on it. It developed the mystery "alky miss" and did not run nearly as well as it should of. APD was close so John Kyle did a bunch of work and figured it out with a cam he designed. They also have designed some of the best bbc heads on the market.
    like to hear more about this 'alky miss'....is this the miss big inch alky engines develop...and a longer exhaust duration helps clean it up?? :?:

  9. #9
    Senior Member RACING JUNKIE
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    Quote Originally Posted by maxpower671
    Quote Originally Posted by hammertime
    Quote Originally Posted by michael1
    Quote Originally Posted by hammertime
    Actually you an put a 4.625 in a 9.8 and make a 615 APD does it all the time
    That's why I asked about a raised cam block, BES does stuff like that also. APD does alot of testing on all kind of stuff, they had a real good article a couple of years ago on some Big Chief testing that they did. I don't think APD gets as much credit as they should.
    Actually do not need a raised cam block. Mine is a 4.5 stroke in a 9.8 deck also.

    That article was the start of a major change in cam profiles, the engine was a good friend of mine, he purchased from a big name builder and put a terminator on it. It developed the mystery "alky miss" and did not run nearly as well as it should of. APD was close so John Kyle did a bunch of work and figured it out with a cam he designed. They also have designed some of the best bbc heads on the market.
    like to hear more about this 'alky miss'....is this the miss big inch alky engines develop...and a longer exhaust duration helps clean it up?? :?:
    There used to be a article on APD's website but they recently updated it and I can not find it. Maybe search the net for it. Should be APD and Big Duke Head. Exhaust duration is part of it.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  10. #10
    Senior Member MASTER BUILDER
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    That article is the reason that my cam has the specs that is has. APD did alot of testing with the 18* stuff.


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