Carb/Intake/Cam in a 305

Discussion in 'High Performance Modifications' started by KEVS79, Feb 1, 2009.

  1. KEVS79

    KEVS79 Veteran Member

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    I know this isn't "high performance"......its a 305, but I figure this would the the section to ask.

    Mine is a stock '79 305. I bought an Edelbrock Performer 2101 and Holley 4175 650 cfm carb. I plan on putting an RV/Performer type cam and headers w/2.5 dual exhaust also. Would this be a good set up, or is the carb too big? Someday I plan on a 350 and would swap these to the 350.

    Thanks in advance for the advice
     
    Last edited: Feb 1, 2009
  2. BondoSpecial

    BondoSpecial Veteran Member Lifetime Gold Member

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    There isn't much I'd do to a 305 that would be appropriate to swap over to a 350....I would not think in that mindset becase you are going to either end up with parts that are too big for a 305, or too small to be of any use for a 350. The 80s 305s at least had 9:1 compression but that engine won't, so be careful with how big of a cam you use. The summit .420/.440 is probably the biggest you'd want in that engine and even that is probably too much.
     
  3. KEVS79

    KEVS79 Veteran Member

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    So are you saying that intake/carb would not be ok for the 305 or the 350?
    Here is the cam I was thinking of:
    Lift .420/.443 Duration @ .050" 204¯/214
     
    Last edited: Feb 1, 2009
  4. BondoSpecial

    BondoSpecial Veteran Member Lifetime Gold Member

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    thats the summit cam, right? How many miles is on this engine? If it has a lot of miles I would be more worried about power you are losing due to worn rings and valves than how much you are going to make back from a cam.

    But yeah that cam would probably be okay. Then you start getting into, some converter and gear would help. But then you are on you way to spending money on a 305 car.
     
  5. KEVS79

    KEVS79 Veteran Member

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    It has 106,000 miles and it was bought new by my in-laws.

    The cam is from a local machine shop which I can get for $80.00 for the cam/lifters and timing set.
     
  6. my24ktrat

    my24ktrat Veteran Member

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    ...That stuff you have for the 305 would be fine , except shelve the 650 carb and either go with a Quad. or holley 600 ,and be good for a daily driver, or other cams to ponder , CCXE256, CCXE262 or regular CC268,as long as the motor looks like it has been taken care of it should be fine,went that route in a 83 4 door regal [winter beater] with over 100k ,transplanted 305 for miles ,Quad. ,performer, CCXE262 ,everything else stock, and was a great everyday motor , just my .02 , DC:bowtie:
     
  7. RacerRick

    RacerRick Veteran Member

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    I have found that the factory 350 camshaft, and a decent intake, carb, and headers really wakes up a 305. That summit cam should work well too.

    I have a 305 in a 3500lb 57' (its dressed up like a 283) that gets 25mpg and scoots the car into the 15's (15.89@87mph best) with a TH700, and 3.36 gear. My goal is to get the car into the 14's without loosing any gas milage or removing anything more than a valve cover.

    I am running an early 327 intake with a 600cfm 1850 holley, corvette valve covers, and small rams horn manifolds, and a stock points ignition. Other than that, the engine is a dead stock GM Goodwrench crate motor that was in an 85' Caprice parts car, where the trans came from also.

    Next up is to change the points over to a pertronics and recurve the distributor, and a set of ceramic coated headers I picked up for $50. I would also like to get rid of the aftermarket 7 blade fan for an electric, and might try some roller rockers if I can find some that will fit under the early vette rocker covers.
     
  8. Spot_remover

    Spot_remover Veteran Member Gold Member

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    How would power pack(pyramid) heads work on a 305? WOuld they be better than stock, i have an 83 305 out of a blazer. Also Racer rick can you give more info on that 350 cam. im building a 305 for my Elco and want to use it as a DD and get good mileage.
     
  9. BondoSpecial

    BondoSpecial Veteran Member Lifetime Gold Member

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    the 305 heads from the 80's are good heads, you don't need any more than that. The 081 TPI heads and '416 perimeter bolt are good heads. If you want the 0.383"/0.410" stock take out cam I have from a crate motor with matched lobes I still have it. It was run for break in only and a few short trips. I have all the lifters
     
  10. RacerRick

    RacerRick Veteran Member

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    Some 305 heads flow better than power pack heads.

    601, 416, and 801 castings are the good ones with perimeter bolt valve covers. 081's are the same as 416's but with centerbolt valve covers from what I hear.

    Avoid 450, and 434 casting heads. They are just crap.

    The cam I am using is the .390/410 gm "929" cam. The 929 is the last three digits of the GM part number. It is what came in the goodwrench motor I am using and I have never changed it.

    You can get more power with an aftermarket cam I am sure, but for the price its hard to beat.
     

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