Honest truth for 1970 455 and 455 Stage1
Over and over iv'e read that the true output on the 70 455 Stage1 was 400 to 420hp. and also heard Mr. Manner claim it was 376 hp.
Iv'e also come come across that the Stage1 package only added something like 16hp. over the base 455.
Factory fresh Stage1 car's time slips do indicate it could be 400hp.+ but as Mr. Manner quoted the Stage1 package was just that, carefully chosen pieces and settings that benefited off each other like the trannie shifting points, 3.64 rear and optimum timing to make it run that fast off the showroom floor, plus lot's of torque:bgrin:
If they would to take 10 random Stage1 engines of the assembly line "which didn't suppose to have the best tollerances" what would be the average HP and TQ spec's?
As much as iv'e tried I only have found one U tube video of a built to stock spec Stage1 dyno test and even then it had roller rockers but a lowered compression ratio down to 8.5 to 1 or 9 to 1. All else stock but after 3 pulls it just managed 400 hp. and 507ft.lbs
I'm sorry I know this has been asked 1000's of times but I still can't find a good true power number:confused: