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Olds 307 to Olds 350 swap

Discussion in 'Small Block Tech' started by 86Regal_Pearl, Jun 24, 2006.

  1. GS464

    GS464 Hopelessly Addicted

    I'll assume you mean who is Joe M. and not me.... :Brow:

    Joe is also known as "Dr. Olds". Been building, modifying and racing the Olds engines for a long, long time. The #5 heads are supposed to breathe better. No idea why though he can tell you. His shop is or was in Paso Robles, CA.
     
  2. Junkman

    Junkman Well-Known Member

    Joe Mondello is THE Olds performance engine guru . Big time Olds drag racer,engine builder in California. Olds performance parts are sold through his shop- Mondello Performance. Another Olds small block engine to consider is the 403 which came in a lot of late 70's GM cars.Even Buicks! Bone stock , the 403 makes 320 ft.lbs. of torque at a low 2400 rpm.Torque wins races! 2 ways to increase compression : Expensive way- new pistons 10.0 to 1 or cheap way-bolt a set of #5,#6 0r #7 heads on the 403. The head bolt holes will have to be enlargened to 1/2 inch dia. I would use the #7 or 7a heads from a '71-'72 Olds 350 engine with the hardened valve seats. For some reason,the '71-'72 Olds Delta 88 350 engine uses a 2" intake valve.The same size valve used on the 403 #4a head. The 403 looks and is outside dimensionally the same as a 350,307. A 403 with some squeeze,Performer intake,mild cam,headers should make your car run in the 13's and be dependable .Even with a highway gear.
     
  3. sean Buick 76

    sean Buick 76 Buick Nut

    I have a free Olds 455 for you but I'm probly a ways away....
     
  4. 86Regal_Pearl

    86Regal_Pearl G ride G-Body

  5. Hector

    Hector '79 Buick Limited


    Very good info and advice :TU: .
     
  6. alec296

    alec296 i need another buick

    i dont see the need for hardened valves my 65 v6 runs fine on pump
    as does my 72 convert with a 430, my fathers 72 electra
    i was told the metal gm got for blocks/heads back then had a lot
    of nickel so they where hard enuff for unleaded seats,spend the
    money where its needed
     

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