455 H.o Engine

Discussion in 'The "Other" Bench' started by 68 buick sk, Nov 21, 2010.

  1. Tom Miller

    Tom Miller Old car enthusiast

    You have a YC 1971 325hp 455 with #66 D-port heads.
     
  2. 68 buick sk

    68 buick sk Well-Known Member

    Is this any good ,what do you mean by this
     
  3. DaWildcat

    DaWildcat Platinum Level Contributor

    There's not much more to know! What do you mean by "good"?

    It's just a 1971 325 hp Pontiac 455! What more is there?

    Devon
     
  4. 68 buick sk

    68 buick sk Well-Known Member

    Thanks for the help guy's i do appreciate this Denis
     
  5. David G

    David G de-modded....

    I think a good question of you, is what do you intend to do with the engine? It's a 455. It'll give you plenty of power if that's what you're looking for, build it for the power level you want. If you're looking for good gas mileage, forget it. What is your intended purpose?
     
  6. 68 buick sk

    68 buick sk Well-Known Member

    Is this gasket kit good for that motorhttp://cgi.ebay.com/Fel-Pro-Full-Overhaul-Gasket-Set-Kit-400-455-Pontiac-/120598151639?pt=Motors_Car_Truck_Parts_Accessories&hash=item1c1435c1d7
     
  7. DaWildcat

    DaWildcat Platinum Level Contributor

  8. 68 buick sk

    68 buick sk Well-Known Member

    This motor is just to put around town in the summer maybe i should leave it the way it is because it is running good as it is thanks Denis,
     
  9. David G

    David G de-modded....

    If it's running fine, I'd leave it alone. Maybe buy rebuild parts "just in case".
     
  10. 68 buick sk

    68 buick sk Well-Known Member

    Thanks guy's for those great information i will keep you posted as i go whit this project Denis.
     
  11. JLP

    JLP Well-Known Member

    It is an 8.0 - 1 compression so it will run on present unleaded gas. It may require premium but try regular first. Just don't advance the spark too much or Mr. Spark knock will show up. It is a 325 hp gross engine. Used in Bonnevilles, Catalinas, GP's, T-37, LeMans and GTO. It does have hardened valve seats but if you are going push it then plan on hardened valve seats. It was designed, as was all GM engines in '71, to run on low lead and then in '75 unleaded was mandated.

    Don't rev beyond about 5K as it won't make power above 4800 or so.

    Have fun. Try the performance years web site for more info.
     
  12. DoubleD

    DoubleD Well-Known Member

    whats the casting number over the center exhaust ports?
     
  13. DaWildcat

    DaWildcat Platinum Level Contributor

    66 according to the first page, post 14.

    Devon
     
  14. DoubleD

    DoubleD Well-Known Member

    yes tried to delete since the other posts didnt show but couldnt,sorry to bother you!
     
  15. DaWildcat

    DaWildcat Platinum Level Contributor

    Just pointing it out so you wouldn't have to take my word for it.
    Devon
     
  16. 68 buick sk

    68 buick sk Well-Known Member

    Where can't i get an torque chart for that engine ,i need to take it a part for painting ,thanks
     
  17. DaWildcat

    DaWildcat Platinum Level Contributor

    Google.com in 15 seconds: http://www.google.com/search?source...source=hp&q=pontiac+455+torque+specifications

    Keep in mind that the connecting rod caps have to stay with their repective rods, don't mix them up. Same with cam & lifters if you plan to reuse them - lifters must go back on the lobes they came from.

    Devon
     
  18. 68 buick sk

    68 buick sk Well-Known Member

  19. Golden Oldie 65

    Golden Oldie 65 Well-Known Member

    They'll fit the engine but you may run into a clearance problem with the power brake booster with the tall covers.
     
  20. 68 buick sk

    68 buick sk Well-Known Member

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