Super stock hp level?

[1972ho]

The Boss I think is nhra rated at 345 hp times 9.0 plus 170 for the driver about .500 lift.Thats why most racer run the HO at 325 in E or D more camshaft .515 lift .And they even have a Cj cleveland that runs the same head as the Boss at 305 nhra rating with a little less cam than the Boss for E or F.

[1972ho]

The Boss I think is nhra rated at 355 hp times 9.0 plus 170 for the driver about .500 lift.Thats why most racer run the HO at 325 in E or D more camshaft .515 lift .And they even have a Cj cleveland that runs the same head as the Boss at 305 nhra rating with a little less cam than the Boss for E or F.

[Steve.k]

Does nhra let them run that lift? All my listings say boss .477 lift and 72ho .490. Both ran 4300d carb which was approx. 600cfm.

[1972ho]

That’s what on the blueprint spec for those engine combos,and we no longer have to run the 4300d (750) we have two replacement carbs the Holley 780 and the quick fuel sat-780-vs.The smallest cam combo is the 71 275 hp, the only combo that has to run the 4300d is 1973 combo and it has the .481 .490 camshaft.

[1972ho]

http://www.nhra.net/tech_specs/engine/b ... ORD-71.rtf This is a nhra blueprint spec for 1971 fords

[Jeff Lee]

Does nhra let them run that lift? All my listings say boss .477 lift and 72ho .490. Both ran 4300d carb which was approx. 600cfm.

1971 BOSS 351 per NHRA allowance is .502”/.502”. 4300D is approximately 750 CFM (and quite the collector item being worth in excess of $2500 for a core) although NHRA allows the 780 Holley 3310 or comparable QF 780.
And the Boss 351 has huge compression numbers if you wish to max it out.
Rob Youngblood had his in the 10-teens back in the late ’90’s/early 2000’s in testing. Officially went right at 10.35 in D/S (which was my class and Rob pushed me into E/S). That was an awesome car and no doubt today with his fantastic clutches & advancements in NHRA rules he would be running very low 10’s or 9’s with that same car...which is uselessly lanquishing in some collectors warehouse.

[Steve.k]

Jeff very interesting info. I beleive Rob Youngblood was using a builder up here named Allen Lee. He is also the ss hemi racer i make reference of. Or have i got this wrong.

[1972ho]

Jeff do you know if he was running on the factory 330 hp or the revised nhra 355 hp when his car was making runs like that,I’ve heard he is the reason that it’s at 355 now.

[SupStk]

Jeff very interesting info. I beleive Rob Youngblood was using a builder up here named Allen Lee. He is also the ss hemi racer i make reference of. Or have i got this wrong.

Lee did the short block and dyno work. The heads I done. According to Rob he was tore down 7 times in three different divisions. Passed every time.
He told me the car ended up in Norway or Sweden, don't recall which.

[Steve.k]

Allen told me that he would run a detuned motor to gather points then put the other in for national events or records. By chance did you work on Bills heads also? Why are the engines allowed more lift than allowed from factory? I know ford did have over the counter cams available is that the reason? Always was under the assumption they had to stick with factory lift !also did you prefer the small valve AA head.

[SupStk]

Allen told me that he would run a detuned motor to gather points then put the other in for national events or records. By chance did you work on Bills heads also? Why are the engines allowed more lift than allowed from factory? I know ford did have over the counter cams available is that the reason? Always was under the assumption they had to stick with factory lift !also did you prefer the small valve AA head.

I wasn't aware Rob was switching engines, no mention of that to me.
Did no heads for Bill that I recall.
According to NHRA build specs the Boss 351 was allowed .502? lift. Don't know how that happened. Could of been in the Stout, Bowles, Roush days picketing NHRA. Holley carbs were not original on CJ and Premium fuel 4Vs either. The carbs allowed had list numbers that were original on 429SCJ.
Aren't the AA heads open chamber and not legal on the Boss?

[Steve.k]

Yes i guess the aa heads would be on cj. Open chamber. Had a stock e guy looking in my spares for aa.

[Jeff Lee]

Just called Rob and his was rated at 350HP when he started and 355 when he quit racing the car (which went to a collector in Pennsylvania and has not seen the light of day since 2000 or 2001).
Yes, Allen Lee on the short-block and Marty on the heads (Rob says hi and hears you may be building a Boss 351 yourself?).
No, he never switched engines around.
And I was there watching when he stood the first Boss Mustang straight up in the air and crashed it. Think about the lack of rear overhang on a ’71-73 Mustang and imagine the car straight up. It’s a sight for sure! He quickly found another body and continued racing.
HO cam is .515”.
Rob says Merry Christmas to all and his gift is this: RY108 from Comp Cams is the cam to use on either your HO or Boss.
That’s the go-fast cam but now he and I use Spiro Jennings at Redline Racing Cams and feel confident he can do better.
And of course Rob has his Advanced Clutches that are light years ahead of what he ran back then. Call him for your own Christmas present!

[Steve.k]

Thanks for clearing this all up. Very good info for sure. I thought al said he would switch but guess not. Als a smart guy known him for years. Sounds like you guys made a great team. I remember hearing lots about Robs car. I was one of a few die hard cleveland guys here.

[SupStk]

Hi back to Rob! I stand corrected on where the car went.
The Boss project is stalled now and waiting its turn.
A while back I talked to Spiro about a Boss 302 project. Did he start on it?