As far as hp and trq output,,,a little detail goes a long ways. The original 455 motor in my 70 gto made 491 hp and 570 trq. To me its so very close to something GM could of easily put out. 9.7 -1 comp,stock intake, qjet,ra4 sized hft cam. #64 heads at 254 cfm. Jetting and timing optimized. Remove 18 hp when adding ra exhaust manifolds. Could of made something like that production seems to me. When I bought my car it still had the original 068 cam and dist setup. Taking the original springs off the dist advance weights i had to use pliers. Total timing would of probably happened after the engine redline
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.45 @ 88.1 mph on slippery street tires.Bad 2.19 60ft.Owned since 86'
Last edited by scott70; 10-18-2020 at 10:10 AM.
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