350 Buick Race Motor

Discussion in 'Parts for sale' started by BuickRacer69, Mar 7, 2019.

  1. BuickRacer69

    BuickRacer69 1320, Mark of the Beast

    I think with the right heads and cam you could run this on pump gas, or put it on E85 and have a rocket ship.

    I have had some unforeseeable family issues occur, if this engine is something you want the time to make a deal on it is now. If I do not make one shortly I am going to shove it into a corner because I simply won't have time or energy to deal with this.
  2. knucklebusted

    knucklebusted Well-Known Member

    Can I get all the specs in one spot? The calculations say a 6cc piston which I think should be -6cc if it is a dome. That makes a big difference in the compression ratio.

    So, the bore is 3.830 and the stroke is 3.930. What are the specs on the crank? Swapping a stock crank stroke would get it back to pistons .040 down the bores and get the comp more in line with a street motor.

    I'm trying to figure out if I can make enough easy changes to make it streetable.
  3. BuickRacer69

    BuickRacer69 1320, Mark of the Beast

    The short block is a stock 350 block with all the oiling mods done, main studs with straps on the main caps, a short fill, and the whole block has been deburred.

    The crank has been hand profiled, the mains were index ground .010 and the rods were offset ground to 1.880 to run the race Honda rod bearing. It has also been internally balanced with Mallory slugs added to the counterweights.

    It has a set of Eagle rods in it, and a set of .080 over Chevy 265 Ross pistons in it with valve reliefs cut for the Buick head. (.030 over STD Buick Bore)

    It has a pretty big solid flat tappet cam

    Intake .638 lift and 268 Duration @.050
    Exhaust .618 lift and 274 Duration @ .050

    It currently has a billet double roller timing chain, a front cover with all the oiling mods done and an oil pump set up on it.

    This is basically everything. The pistons are flat tops with valve reliefs, no dome. The +6 cc is valve relief
  4. knucklebusted

    knucklebusted Well-Known Member

    So, bore is 3.830 and stroke is +0.010 for 3.86?

    I'm not understanding something. That comes out to 356 CID at 11.87 CR. There is something that isn't there or a typo somewhere.

  5. BuickRacer69

    BuickRacer69 1320, Mark of the Beast

    The Stroke is 3.930, the crank was offset ground
  6. knucklebusted

    knucklebusted Well-Known Member

    So, you said it was index ground 0.010 so I do not understand the mechanism here.
  7. BuickRacer69

    BuickRacer69 1320, Mark of the Beast

    The rods were offset ground, making the stoke 3.930, the mains were index ground .010 to clean them up.
  8. knucklebusted

    knucklebusted Well-Known Member

    OK, that makes sense now.

    So, I get right at 12:1 with what I hear so far if my math is correct. The closest E85 is 22 miles away. I wish I could use it but I'm in over my head.

  9. BuickRacer69

    BuickRacer69 1320, Mark of the Beast

    Sale Pending
  10. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    The mains don't get index ground, the rod journals do, they get indexed to the stroke and the degrees of rotation when it is index ground. That's probably what threw a couple people off?
  11. BuickRacer69

    BuickRacer69 1320, Mark of the Beast

    When I've heard the mains referred to ask index ground, they make all the journals the same size. If they don't index grind the touch off on the journal and cut .010. That could have just been a communication issue on my part and I apologise for the confusion
  12. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    This should help explain;

  13. 1972Mach1

    1972Mach1 Just some M.M.O.G. guy.....

    12:1 is not E85 territory yet, you can run pump 91-93 octane with 12:1 depending on cam specs and altitude. I've got 13.5:1 and run on 91 octane at 3500 ft elevation.
    Last edited: Apr 24, 2020

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