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Oh and is the 455 basicaly a 454?
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Nope,back in those day's each manufacture were engine specific.In 1970,olds had there own style of 455,Buick's 455 was different,Pontiac's 455 was different and Chevy's 454 was different.
Buick offered 3 different HP ratings in the 1970 455,350HP,360HP and 370HP.
Engine ID code for a 70 455 is
SR for a 455 350HP ,
SS for a 455 360HP and
SF for a 455 370HP and they all had 510 FT lbs of torque @ 2,800 RPM
~Larry~