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Thread: Changing cam and convertor, what ya think?

  1. #1
    Junior Member APPRENTICE
    Join Date
    Mar 2006
    Location
    Baton Rouge, La.
    Posts
    15

    Changing cam and convertor, what ya think?

    Hi all,

    Changing the cam and convertor in my car. Here's a rundown on the combo. '69 Chevelle, pump gas, street/strip.

    385cid 10.3:1CR 4.040 X 3.750
    Brodix IK 200cc 2.02/1.60
    Performer RPM Air-Gap Holley 750
    Erson 278 solid roller 278/286 238/246 .555/.555 108/104
    1.6 in/1.5 ex roller rockers
    th 350 3000 stall 4.10 gear 27" tire
    3500lbs w/driver

    New cam
    286/296 256/262 .549/.543 106/102 Solid FT Dynamic CR 8.2:1

    Going to put in a 4000 stall. Cam is supposed to pull 3200-6900.

    Biggest thing is whether or not that cam will work decently. Intake may get changed to a Vic Jr but so say, the Air Gap isn't giving away much to the single plane.

    What's your thoughts?

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    May 2006
    Posts
    2,044
    The new cam should work well, not sure how much of a difference it will make as both cams are very similar. The biggest improvement you'll notice will be from the higher stall converter.
    Changing the intake to a single plane like the victor jr will help upper rpm horsepower a bunch over the dual plane, but it will kill some torque down low. If you go the single plane route I'd go with alittle more gearing, something like a 456 or 488 would be a killer choice for a heavy car like yours and coupled to a single plane intake, you would notice a profound difference in acceleration, however down side is that it would be wound up all the time on the street. I know your limited to camming due to your lower compression for pump gas and streetabilty but bumping it up to about 11 to 1 or 12 to 1 would really wake up your car espcially with a more agressive cam. You have some killer heads already, just missing a couple keys ingredients for a monster engine. I.E< compression, cam.
    I know your caught between a rock and a hard place wanting streetablity, and not wanting to get into the expense of having to buy race fuels and then wanting it to be fast at the track too. I know the feeling.
    Sorry for writing a book here, first post of the night for me and I'm killing time here at work so there you go. I seen you hadn't had any replies yet so I chimed in.
    Goodluck with your new combo, Charles
    ***IN GOD WE TRUST***

  3. #3
    Junior Member APPRENTICE
    Join Date
    Mar 2006
    Location
    Baton Rouge, La.
    Posts
    15
    The cam change is what I'm debating. I'd be going from a mild solid roller to an aggressive solid FT. The solid roller is 238 @ .050" and the solid FT is 256 @ .050" but how much of a gain is really there when you add in the area under the curve? Lift values are close.
    '78 Chevy Luv--383
    '68 Camaro-- 383 Twin 60-1 turbos
    '69 Chevelle--385 N2O


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