750 holly

Discussion in 'Tips 'n' Tricks Topic' started by gvernak, Dec 26, 2014.

  1. gvernak

    gvernak New Member

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    Apr 28, 2014
    Holiday, Florida
    Hi gang....
    I'm building a 75 Camaro with a 350 4Brl, putting a Comp cam CS 279T H-107 T thumper cam, 2.02-1.6 heads, Edb RPM intake, roller tip rockers... have a 750 holly for it. was wondering if I should go with a 65o instead? Going to put a 3:55 posi or maybe a 3:73. auto has shift kit. any suggestions before I break my back putting it all on? Have all the engine parts ready to go.
     
  2. COPO

    COPO Veteran Member Lifetime Gold Member

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  3. legierk

    legierk Veteran Member

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    Jun 11, 2014
    Waskom, TX
    Bigger is not better. Same with that cam. Thumpers are all show and no go. Sorry to be so direct, but.......with that cam (if you insist on it or already have it), the 650 will be much better. It will put back the torque you're going to lose using that cam. When filling in data for carb or cam choices, its best to be brutally honest. Is it a factory short block with 9.0 compression (or less)?

    I would (in a perfect world), choose the 650 (for a SBC), and a different cam (Xtreme energy line). As for gearing, the 3.73s are heck on the freeway without an OD trans. But, the higher (numerically) the gear, the more carb and/or cam you can run. It depends on what you ultimately want to do with the car.

    To put another way, if you chose the 3.55 gear, Thumpr cam and 750, you would have less HP and MUCH less torque than with any other combination. It would be a dog.
     
  4. gvernak

    gvernak New Member

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    Apr 28, 2014
    Holiday, Florida
    Thanks Keith for the input. I just wondered... Had a 650, but sold it and got the 750. The 2.02 heads are Decked, but I didn't want to put bigger springs, and the cam recommends a 2000-2500 stall or stock converter. Only going to drive around town, stock is too much like a CHICK CAR!!! (No offense to the Gals!) the 75 only has 155Hp with the 4barrel. Had a 69 Mach I fastback I built to 450HP + 100 shot Nos... Built a 76 TA Pontiac 400,
    but never worked with the 350 Chevy. Lot of people telling me and trying to sell me NOT what I want. Just want to give it a lil more Oomf!
     
  5. gvernak

    gvernak New Member

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    Apr 28, 2014
    Holiday, Florida
    Same for the 15X10 Cragar rims I got to put on the back... Oh Sure they'll fit... put 295-50-15's on it... it will look great, they said! Glad I only paid $60 for the pair and they look NEW! Lol
     
  6. gvernak

    gvernak New Member

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    Apr 28, 2014
    Holiday, Florida
    Thanks for the Input Bro!
     
  7. CamaroDoc

    CamaroDoc Veteran Member

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    Skiatook, Okla. 74070
    I take it you don't like them? Would you like to sell them?
     
  8. gvernak

    gvernak New Member

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    Apr 28, 2014
    Holiday, Florida
    I think I'll put some 60's on them. Thanks though!
     
  9. hhott71

    hhott71 Veteran Member Lifetime Gold Member

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    Mar 30, 2001
    Joplin Mo. 64801
    I run quicker with a 650 DP and have no problem crossing the line at 119 mph and 6500 rpm.
     
    Last edited: Dec 28, 2014
  10. Gary S

    Gary S Administrator Lifetime Gold Member

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    Apr 14, 1999
    Bismarck, North Dakota
    I found the same thing as COPO. We had a 327 and tried both a 650 and a 750. The 650 ran out of juice on the top end. the 750 ran stronger.

    I'd recommend you keep what you have. If it is jetted right, the 750 has more rpm capability than the 650.
     

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