What's the best Combination 470ci or 482ci

Discussion in 'Street/strip 400/430/455' started by Rossco Mason, Apr 23, 2017.

  1. Rossco Mason

    Rossco Mason Active Member

    Whats involved in building a 482ci
    What's the gains compared to a 470ci
    And which combination will stay together longer, i ran away from the 494ci due to Crank failure & much machining for me.
  2. Jim Weise

    Jim Weise EFI/DIS 482

    In a Street application, it's my strong belief that there is no advantage to the bigger motor. Just like the 494, many guys have reported their 464 going as fast as their 494.. so I don' t think there is a performance advantage in any of these small stroker motors.

    The TSP 470 came about, because of cost. Initially, aftermarket Buick rod choices were very limited, and the offset grind to allow for a BBC rod saved a bunch of money, as well as one could design the correct piston to achieve zero deck clearance with just a .020 deck cut/square.. This was a big advance for the 455 at the time, the only way to do it before then was custom Pistons.. at a cost of around 1 thousand dollars for the set of 8 with pins.

    Fast forward to today, now there are other drop in rod choices, pistons with better compression distances, but the customer is again limited to the dish CC that the vendor decides is correct for them. With the TSP 470, you can customize your pistons for just a minimal extra cost, not get moved into expensive custom pistons again..

    The 482 is a combo that the only difference is a bigger offset grind, and a 2.100 rod journal vs the 2.200 of the 470. To currently build a 482, your looking at $1200 custom rods.. so we are back to a cost issue again. I have Molenar building us 482 rods, that will sell for $590, but as of yet I had not heard if they are available. I have inquired a couple times.

    Once that rod is available, I am going to custom design a piston combo for the 482, a flat top with reliefs, small ring package, superlight options ect that will be aimed at the drag racing market. The 482 rod will also be available as a drop in replacement to change any 470 combo to the 482 combo. The rods are the same, other than the big end diameter.

    So there will be 3 choices then:

    482 High compression combo (For drag race or E-85)
    482 Street combo
    470 Street combo

    I don't believe there will be any great difference between the last two, other than bragging rights.. The 482 will be more expensive to build, due to .100 more grinding needed on the rod journals.

    Last edited: Apr 23, 2017
  3. Bad Buick

    Bad Buick Foe Fiddy Five

    If a 470 makes 550 hp thats 1.17 hp per CI..if the 482 was set up the same way then 12 more cubes would be approximately 14 more HP.

    I think saying "its a 482" sounds cooler than saying "its a 470"..but that's just a IMO thing.
  4. Jim Weise

    Jim Weise EFI/DIS 482

    Thanks for your input Bob.. yes, with adequate head flow the bigger pump will make more power, that's true.
  5. 87GN_70GS

    87GN_70GS Well-Known Member

    Do you have any numbers for weight for the rods and street pistons for the 482?
  6. staged2ny

    staged2ny Silver Level contributor

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