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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> So why the difference?
Post Info TOPIC: So why the difference?
66 Grande guy


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So why the difference?
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I'm just curious if anybody knows why there is a stated 5 horsepower difference in the rating of the 1966 L36 (390 horse 427) and the 1967 one.  Is there any differcence at all really?



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ken from northern Alberta

38 Willys pickup electric

39 Buick (327 with 700 r4)

66 Beaumont 4 door hardtop

69 Chevy CST pickup

1976 GMC 23'  motorhome

1994 Impala SS (temporary, according to my wife)
68 427


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IT WAS 1968 THAT HAD THE 385HP RATING. I'M NOT SURE WHY. I BELIEVE THE ARE THE SAME ENGINE. MARKETING REASONS MAYBE? 1969 WAS BACK UP TO 390HP.

 



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   MIKE
65wagon


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personally i think they made the numbers up as they went along.



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4SPEED427


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I have had guys tell me the heads and cam were different but everything I can find says they are the same.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars
Canadian Poncho


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Carl, are the part numbers for the heads and cam different between the two years?
Buick was bad for playing with HP and Torque numbers. In 1970 the Stage 1 GS was rated at 360hp. A non Stage 1 455 in a Riviera was rated at 370HP!


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