Evolution of HP Factors
 

What was the process that moved the '72 Cleveland Mustangs from I/SA to E/SA? Did this come about as a result of numerous assaults on the index, or was there an adjustment to the factors by NHRA? Just attempting to get a better perspective of the history of my combination. :confused:

Been around for sometime - wasn't paying attention. :o

Re: Evolution of HP Factors
 

Dave

I originally built my 71 Mustang 351/280 as a stocker and hit the track in
1987 in I/SA .It was rated at 290 at that time. It got beat up pretty good by
Bill Hawk who was really fast as well as Norm Capton in the early 90's .

I think the 71 351/285 which is at 305 looks pretty good with quite a bit more
compression albeit with a bit less lift.

Maybe someone else can add who else helped out in the evolution up to the
current 328 hp.

Re: Evolution of HP Factors
 

George Thomson also ran Joe Threatt's 72 mustang during that time and ran fast at times with it...Norm Captain was very fast with help from Len Shneider...Miss Norm, goodtimes! There have been a few fast 351 cleavland mustangs prior to those...Tex Miller is another fast one!

Re: Evolution of HP Factors
 

Wasn't this one of those combinations that really woke up when the camshaft rules were changed to allow any duration?

Re: Evolution of HP Factors
 

Gary Glazener,remember jousting for the G record in the mid to late 90's. gsa612

Re: Evolution of HP Factors
 

Don't forget the 351C stick cars were very fast back when they would move the HP factor for both auto & stick if there was an adjustment. I am sure that my favorite clutch guy Rob Youngblood and also Dave Picht are responsible for some 351C HP hits.



Rob Turkal
3105 Stock

Re: Evolution of HP Factors
 

Thanks to everyone for their perspective! It appears that I would be safe in the assumption that the Cleveland combos took numerous hits and steadily increased in HP to cause the class shift?......and yes, Tex is STILL fast!!

Re: Evolution of HP Factors
 

I feel your pain Dave ! 302 2 bbl ? ;) ---Trevor

Re: Evolution of HP Factors
 

Between the 71', 72' and 73' what do you think is the best combination for stock class. Based on the current horsepower ratings.

Re: Evolution of HP Factors
 

Probably the carb/intake more than the cam? 600ish to 780.