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Thread: 598 SLUG

  1. #1

    598 SLUG

    THIS MOTOR WONT GO OVER 6800 AT THE LIGHTS,, ALL NEW.BEST OF EVERY THING.1150 CARB..850 LIFT CAM.287-309- DURATION @.050.110 C/L.14./1 COMP. BRODEX HEADS,365 PORTS.356 LBS SPRINGS.3200 LB CAR 55 CHEVY.. 1.23 60 FOOT.. 8.65 @1000 FOOT. 9.43 @141MPH, ET?? 4.10 GEAR.. 4.56 GEAR.. CARB SPACER. MSD 7AL. NOT CRANK TRIGGER.. YOU CAN PUT 50 DEG. TIMING OR 36 DEG TIMING CAR RUNS THE SAME. PLUGS LOOK GREAT. GROUND SHOWS NO HEAT AT ALL!!POWER GLIDE. 29.5 TALL TIRE. :cry:

  2. #2
    Senior Member RACING JUNKIE
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    May be too much cam for the heads, i know of an identical situation about 3 yrs ago. 598" Brodix 2 extra heads, tunnel ram with 2 1150's almost the same cam, in a 2600 lb Vega. Thr car would not run less than 5.70's in the 1/8 mi, it would run 5.30's with 400 shot of nitrous. Heads were ported but wouldn't flow over 370 cfm. He has since torn it down and going with another combination. Another problem he had was it had 2 1/8" headers with 4" collectors.
    These are just my opinion of what was wrong with the Vaga motor and may not be your problems.

    Zip.

  3. #3
    Senior Member RACING JUNKIE BEAST477's Avatar
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    What brand of 1150 is it? Have you tried jetting up? You might be running out of fuel at the stripe. You also might want to try a 1250 if you could borrow one that you know works.
    BEAST477






    Only a rich man can afford to use cheap parts.

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  4. #4

    598 SLUG

    Quote Originally Posted by zipper06
    May be too much cam for the heads, i know of an identical situation about 3 yrs ago. 598" Brodix 2 extra heads, tunnel ram with 2 1150's almost the same cam, in a 2600 lb Vega. Thr car would not run less than 5.70's in the 1/8 mi, it would run 5.30's with 400 shot of nitrous. Heads were ported but wouldn't flow over 370 cfm. He has since torn it down and going with another combination. Another problem he had was it had 2 1/8" headers with 4" collectors.
    These are just my opinion of what was wrong with the Vaga motor and may not be your problems.

    Zip.
    I DO HAVE 1/78 HEADERS!!MAY BE IT?? THANKS

  5. #5

    598 SLUG

    Quote Originally Posted by BEAST477
    What brand of 1150 is it? Have you tried jetting up? You might be running out of fuel at the stripe. You also might want to try a 1250 if you could borrow one that you know works.
    I HAVE NEVER TRIED ANY BIGGER CARB THAN 1150.PLUGS LOOK NICE .. MAY BE RICH ..

  6. #6
    Senior Member RACING JUNKIE BEAST477's Avatar
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    I would say those headers are choking it. Change those and see what it does. Then try a 1250, bet it picks up.
    BEAST477






    Only a rich man can afford to use cheap parts.

    http://www.racingjunk.com/profile/177549

  7. #7
    Member JUNIOR BUILDER
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    I'm going through this same scenario w/ a 598 right now, just won't run the MPH that it should. Biggest problem is the heads, mine has BB2Xtras CNC on it and they just won't support an engine of this CI. I'm agonizing over the Headhunters or the 3Xtra CNC right now. HH's will require new shaft rockers, intake and maybe pistons. I'm running nearly the same cam as you, and all the builders I have talked to said it's too big for the heads, but would work with better heads. You should pick up some w/ better headers, but it's still choked off with the heads. I don't have the coin for the headhunters right now but who knows later on............good luck to you! 8) JB

  8. #8
    Senior Member MASTER BUILDER
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    Quote Originally Posted by BEAST477
    I would say those headers are choking it. Change those and see what it does. Then try a 1250, bet it picks up.
    What he said............

  9. #9
    Senior Member RACING JUNKIE
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    I have more questions to ask, you say it wont go high in the lights, how about at the shift, what are you shifting it at ? If its going over 6800 at the shift ... I'll need some converter info. Stall, Size and such.

  10. #10

    598

    Quote Originally Posted by hammertime
    I have more questions to ask, you say it wont go high in the lights, how about at the shift, what are you shifting it at ? If its going over 6800 at the shift ... I'll need some converter info. Stall, Size and such.
    HI SHIFTS AT 6800. CONVERTOR IS 5500 NITROS.

  11. Racing Junk


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