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cam guru's what do ya think

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    Default cam guru's what do ya think

    hey guys while i wait for parts for my spare motor which will be 1-2 weeks i am seeking advice on a cam change for my 601 bbc in a v-drive flat pump gas deal 10.1 comp. alum pro action 380 cfm @ 750 lift custom t-ram and twin 660 carbs with dual big shot kit 125-350 zoomies for exhaust current cam is a crower roller 268/268 @.050 .737/737 on a 114 centerline that is installed @ 111 intake center engine starts well and is explosive out of the hole without the nos and have not sprayed this motor yet but runs out a little lack luster i think the cam is too small or carbs are as well

    i have a lunati cam out of my t/d 496 that ran 14.1 w/this same spray system and carbs
    cam is 283/293 @ .050 .737/.715 split 110/108 center install was 108 over 100 cu inch diff but 4 points of comp loss hoping to move hp range up and kill off some of the 1100-4000 power and move it up into 4000-7500 range- nos will chime in the 4000-7500 range

    ps i have a pair of 1050 doms but need to get new nos plates for this setup.


    ok so let me have it.?????
    Last edited by flat601; 03-24-2009 at 07:55 PM. Reason: add carb info

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    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by flat601 View Post
    hey guys while i wait for parts for my spare motor which will be 1-2 weeks i am seeking advice on a cam change for my 601 bbc in a v-drive flat pump gas deal 10.1 comp. alum pro action 380 cfm @ 750 lift custom t-ram and twin 660 carbs with dual big shot kit 125-350 zoomies for exhaust current cam is a crower roller 268/268 @.050 .737/737 on a 114 centerline that is installed @ 111 intake center engine starts and is explosive out of the hole without the nos and have not sprayed this motor yet but runs out a little lack luster i think the cam is too small

    i have a lunati cam out of my t/d 496 that ran 14.1 w/this same spray system and carbs
    cam is 283/293 @ .050 .737/.715 split 110/108 center install was 108 over 100 cu inch diff but 4 points of comp loss hoping to move hp range up and kill off some of the 1100-4000 power and move it up into 4000-7500 range- nos will chime in the 4000-7500 range

    ps i have a pair of 1050 doms but need to get new nos plates for this setup.


    ok so let me have it.?????
    A pair of 660s on a 601 cid with 380cc runnered heads, common that sounds like a major mismatch. Even at 10:1 I think the 1050s would be better especially for top end.

    268/268 @ .050" also sounds pretty small for a 601cid deal especially when your asking for power in the 4000-7500rpm range.


    If I had your parts I'd throw the dominators and the 283/293 @ .050 .737/.715 cam in it and see what she does on the motor.

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    thanks carnivalride good to here from you, this is a lakeboat endurance boat with bark on a pumpgas diet. 17 foot v-drive 29 over gear 11x16 menkins turbo 400 spline drive deal. just a toy i had since 1976

    the reason i went with the carbs they are so crisp,custom centerhung mods sideways mount just have never had a set that runs like these,hate to give them up.
    thanks roger

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    steelcomp was here
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    What's the bore and stroke? Rod length, chamber, dome, etc?
    If God is your co-pilot, change seats!
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    steel you know stroke and rod length are banned subjects for you.
    t/d 10.100 deck
    well ok 4.610 bore 4.500 stroke 6.535 rod L19 flattop j/e pistons heads are pro/action milled to 114cc with a sce .021 thick copper o-ringed block

    just for bs.i called all the big name cam companys with this info and they were all over the map with cams from 108 -120 lobe centers and duration # from 267-290's i went with what i felt was best for the compression i have.


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    Quote Originally Posted by flat601 View Post
    alum pro action 380 cfm @ 750 lift


    cam is 283/293 @ .050 .737/.715 split 110/108 center install was 108 over 100 cu inch diff but 4 points of comp loss hoping to move hp range up and kill off some of the 1100-4000 power and move it up into 4000-7500 range- nos will chime in the 4000-7500 range
    Even with the dommies, can that cam with those heads (380 cfm's) get 600 inches to 7,000+ ? Will any cam get 600" to 7,500 with a 380 cfm head ?

    That same cam with a 114 * lobe sep would give it some more legs upstairs. Or something around 280-288, .750-.760 lift with a 112-114* lobe sep might work. But I'm no cam Guru

    Sleeper CP

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    steelcomp was here
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    Quote Originally Posted by flat601 View Post
    steel you know stroke and rod length are banned subjects for you.
    t/d 10.100 deck
    well ok 4.610 bore 4.500 stroke 6.535 rod L19 flattop j/e pistons heads are pro/action milled to 114cc with a sce .021 thick copper o-ringed block

    just for bs.i called all the big name cam companys with this info and they were all over the map with cams from 108 -120 lobe centers and duration # from 267-290's i went with what i felt was best for the compression i have.

    C'mon now...
    I have a new VE calculator, but I'm not getting what I want out of it. I'll have to do some more research.
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    Quote Originally Posted by flat601 View Post
    thanks carnivalride good to here from you, this is a lakeboat endurance boat with bark on a pumpgas diet. 17 foot v-drive 29 over gear 11x16 menkins turbo 400 spline drive deal. just a toy i had since 1976

    the reason i went with the carbs they are so crisp,custom centerhung mods sideways mount just have never had a set that runs like these,hate to give them up.
    thanks roger

    So, how will this 1976, 17' boat handle at 117mph?

  11. #9
    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by flat601 View Post
    thanks carnivalride good to here from you, this is a lakeboat endurance boat with bark on a pumpgas diet. 17 foot v-drive 29 over gear 11x16 menkins turbo 400 spline drive deal. just a toy i had since 1976

    the reason i went with the carbs they are so crisp,custom centerhung mods sideways mount just have never had a set that runs like these,hate to give them up.
    thanks roger
    I understand being happy with the throttle response and driveability but I'm running a pair of 750DPs on a 467cid BBC and they are very responsive, even more so than the fancy flowed 850 (990cfm) and single plane intake I had before and they're just as driveable. I honestly have very little experience in big inch stuff but if 750s run as good as they do on mine then in comparison 660s seem undersized for you.

    I don't know enough about your heads to make a cam guess but as a hot rodder if you have that other cam laying around I guess for the price of gaskets and an afternoon in the garage I'd try it. LOL

    Good luck,
    Loren

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    just a ski boat with bark Carnivalride's Avatar
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    Quote Originally Posted by flat601 View Post
    t/d 10.100 deck
    well ok 4.610 bore 4.500 stroke 6.535 rod L19 flattop j/e pistons heads are pro/action milled to 114cc with a sce .021 thick copper o-ringed block
    Nice looking engine, must be rough running 601cid as a "lake motor"

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    Quote Originally Posted by flat601 View Post
    hey guys while i wait for parts for my spare motor which will be 1-2 weeks i am seeking advice on a cam change for my 601 bbc in a v-drive flat pump gas deal 10.1 comp. alum pro action 380 cfm @ 750 lift custom t-ram and twin 660 carbs with dual big shot kit 125-350 zoomies for exhaust current cam is a crower roller 268/268 @.050 .737/737 on a 114 centerline that is installed @ 111 intake center engine starts well and is explosive out of the hole without the nos and have not sprayed this motor yet but runs out a little lack luster i think the cam is too small or carbs are as well

    i have a lunati cam out of my t/d 496 that ran 14.1 w/this same spray system and carbs
    cam is 283/293 @ .050 .737/.715 split 110/108 center install was 108 over 100 cu inch diff but 4 points of comp loss hoping to move hp range up and kill off some of the 1100-4000 power and move it up into 4000-7500 range- nos will chime in the 4000-7500 range

    ps i have a pair of 1050 doms but need to get new nos plates for this setup.


    ok so let me have it.?????
    Need the flow numbers on the heads. What rocker arm ration are you runing? What size is the intake valve?
    Chris Straub
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    Quote Originally Posted by cstraub View Post
    Need the flow numbers on the heads. What rocker arm ration are you runing? What size is the intake valve?
    [email protected] lift 2.300x 1.94
    1.8 stainless rockers

    so cam lift # will grow a little maybe .030 lift
    Last edited by flat601; 03-25-2009 at 08:41 AM. Reason: added lift info

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    Quote Originally Posted by Carnivalride View Post
    Nice looking engine, must be rough running 601cid as a "lake motor"
    motor was built for and tested in hydro with with great results. had some life insurance trouble and couldnt find any coverage for racing so i put the hydro on the lake witch turns out to be twice as dangerous as racing, in short hooked a sponson and sold a hydro. the flat can do anything i ask it to do and has for 33 years and never been wet... well sank 2 times both time not underway befrore i put splash gaurd back/wife was with me the first time (she's not so much of a boater as it turned out)

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    cfm
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    Quote Originally Posted by Sleeper CP View Post
    Even with the dommies, can that cam with those heads (380 cfm's) get 600 inches to 7,000+ ? Will any cam get 600" to 7,500 with a 380 cfm head ?

    Sleeper CP
    Depends if a 310cc head or a 360cc head or a 380+ head. IE: A big motor at big rpms needs big ports, within reason of course. Getting into a choke situation with 600cid at 7k+ would be pretty easy to do.

    What size are these heads ? Are they ported ? If so, whom and have you asked them about cams ?

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