Evolution of HP Factors

Dave Turner · 12-07-2013, 06:00 PM

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.

Been around for sometime - wasn't paying attention.

Kevin Love · 12-07-2013, 09:42 PM

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.

Randy Loge · 12-08-2013, 12:17 AM

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!

Tony Curcio · 12-08-2013, 12:50 PM

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

gsa612 · 12-08-2013, 01:31 PM

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

Rob3105 · 12-08-2013, 05:46 PM

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

Dave Turner · 12-08-2013, 06:28 PM

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!!

tj310 · 12-08-2013, 08:16 PM

I feel your pain Dave ! 302 2 bbl ?

---Trevor

IanM · 12-10-2013, 09:14 AM

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

Bobby DiDomenico · 12-10-2013, 09:46 AM

Quote:

Originally Posted by Tony Curcio

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

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

12-07-2013, 06:00 PM	#1
Dave Turner VIP Member Join Date: Oct 2005 Location: Schomberg, ON, Canada Posts: 1,222 Likes: 1,606 Liked 364 Times in 138 Posts	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. Been around for sometime - wasn't paying attention. __________________ Dave Turner SS/GT #1153

12-07-2013, 09:42 PM	#2
Kevin Love Member Join Date: Jan 2002 Location: canada Posts: 113 Likes: 5 Liked 19 Times in 10 Posts	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. __________________ Kevin Love 5666 STK/SS

12-08-2013, 12:17 AM	#3
Randy Loge Junior Member Join Date: Jul 2002 Location: Livermore Ca. Posts: 22 Likes: 0 Liked 27 Times in 4 Posts	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! Last edited by Randy Loge; 12-08-2013 at 12:21 AM.

12-08-2013, 12:50 PM	#4
Tony Curcio Member Join Date: Mar 2002 Location: West Chester, PA Posts: 271 Likes: 1 Liked 4 Times in 1 Post	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? __________________ Tony Curcio 1860 STK

12-08-2013, 01:31 PM	#5
gsa612 Senior Member Join Date: Jan 2008 Location: 100th Meridian Posts: 569 Likes: 116 Liked 280 Times in 139 Posts	Re: Evolution of HP Factors Gary Glazener,remember jousting for the G record in the mid to late 90's. gsa612

12-08-2013, 05:46 PM	#6
Rob3105 Junior Member Join Date: Jun 2007 Location: Midwest Posts: 20 Likes: 47 Liked 1 Time in 1 Post	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

12-08-2013, 06:28 PM	#7
Dave Turner VIP Member Join Date: Oct 2005 Location: Schomberg, ON, Canada Posts: 1,222 Likes: 1,606 Liked 364 Times in 138 Posts	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!! __________________ Dave Turner SS/GT #1153

12-08-2013, 08:16 PM	#8
tj310 Member Join Date: Sep 2009 Location: Dresden On. Canada Posts: 460 Likes: 0 Liked 0 Times in 0 Posts	Re: Evolution of HP Factors I feel your pain Dave ! 302 2 bbl ? ---Trevor

12-10-2013, 09:14 AM	#9
IanM Junior Member Join Date: Jul 2011 Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	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.