GM 260 horse engine?

Discussion in 'Engine Topic' started by 76z28, Nov 10, 2010.

  1. 76z28

    76z28 Veteran Member

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    What pistons does it have in it? im guessing dished? I have a set of pretty good heads only problem is they are 76cc chambers...Anyone know?
    thanks
     
  2. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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  3. 76z28

    76z28 Veteran Member

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    bakersfield
    i went to jegs but it wouldn't load... i need to get the casting number off the head, they were in my old 330 horse 360 torque motor
     
  4. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    If they are old GM cast 76cc heads, it doesn't matter... The bang for the buck seems to be with the vortec heads. I know you'll have to buy a new intake but it's still a better deal in the long run. Depending on how strong the wallet is, you can step up to modern aluminum designs for not a lot more. IMHO
     
  5. badazz81z28

    badazz81z28 Veteran Member

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    Can't beat modern technology. I can vouch Vortecs are a good budget head. I have ported vortecs on my 350 and has enough power for a street go getter.
     
  6. BondoSpecial

    BondoSpecial Veteran Member Lifetime Gold Member

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    Sep 20, 2004
    Southern Maryland
    They are not only dished, they are dished pistons that are 100+g heavier than even the normal 1970's stock 350 dished pistons. I had to have a lot of metal taken off my crank to balance my 260 hp crate motor when I put normal cheap pistons back in it, we couldn't believe how heavy the hecho en mexico crate motor slugs were. It's something like a 16cc dish.

    76cc pistons on the 260 hp crate motor is going to be very low compression. Even with 64cc heads it will only be around 9:1, which is why I pulled them for some flat tops.
     
  7. 76z28

    76z28 Veteran Member

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    Yea, that is why i was asking...I was afraid but make for a good blower motor untill the bottom end goes. I already have the heads and intake is why i was asking.
    Im just in speculation right now, this is for my dads 68 bel air(has the original 307)
     
  8. Damon

    Damon Veteran Member

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    Nov 16, 2000
    Philly area
    ANY 350 will feel like you strapped a second engine under the hood compared to a stock 307!

    It's really a shame that GM doesn't offer any inexpensive 350 short blocks with flattop pistons (the ZZ4 bottom end which uses flattops is $2500). Or ANYTHING with forged pistons in it (they're all cast or hypereutectic).

    An observation I made recently.... the 260HP 350 LONG BLOCK is less money than just buying the SHORT BLOCK. Sounds crazy, I know, but that's what I found the last time I looked. Buy the complete engine and put your existing heads back on the shelf. Plus you get a cam, lifters, timing chain and the bottom end tin along with it. Saves money plus a bunch of work- just put on your intake and drop it in the car.
     
  9. z28rod

    z28rod Veteran Member

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    hopewell junction,ny
    and it a reliable 350 to boot.....
     
  10. Todd80Z28

    Todd80Z28 Moderator Lifetime Gold Member

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    Northern VA
    Kinda, sorta. You can get the L31 (Vortec) 350 short block with similar-looking dished pistons for $11xx on the web, and my local dealer offered me $12xx. I've contemplated it for a new, budget solution. It's a one-piece rear seal, though.
    Like you said, though- it's a shame you can't get a budget flat-top setup from them.
     

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