1973 Pontiac Firebird Formula 455-SD

[jmracing]

Originally Posted by Paul Ceasrine

Thanks Again,,,,,,,,, Mr. Run to Rund

Herlsow & Merlock from Scotch Plains, New Jersey

1973 Pontiac Firebrd Trans Am SD-455 {455/310 HP} re-factored to 345 HP.

1975 = E/SA

National Record set at ATCO {September 1975}

11.89 @ 112.50 MPH

My name is Jacques Marier from JMRACING from Montreal
July 16 / 2016 at Napierville Dragway at the NHRA National Open with my 1974 trans am SD455 PURE STOCK IHRA car legal at 3838 lbs
11.87 / 113mph qualify 1st (In Canada NHRA accept IHRA race car ) ( 2 time IHRA national record holder in D/PS 2003-2005)

[HP HUNTER]

I've been trying to buy this for years, its sat behind a house since the 70s.


"I'am going to have restored"


Sure you are. And yes its a unmolested SD 455.

[oldskool]

Seems that as I continue to search for Pontiac info I keep running across old threads I need to bring up.

While searching for info on the Herslow & Morlock '73 Trans Am, I ran across this thread. One of the posts says that the car set the E/SA nat record, in 1975.

But, here's why I bring this up. I have 3 pics of the car, before it was SD455 powered. It was still running G/SA, & had "455" on the shaker, which would indicate a D-port 455 engine. But, after they added the lettering, and it was still running G/SA, some of the lettering said the car was an NHRA Nat Rec Holder.

Therefore, does anybody here know when that G/SA record was set, & what the ET/mph was ?

The '73 SD455 Formula cars ran in D class, cause they were lighter than the T/A. John Clegg won D/S @ Indy '73, in his '73 SD455 Formy. But the '73 SD455 T/A's ran E class.

Any help finding info on the G/SA record for the H&M T/A would be appreciated.

EDIT: After I posted this, someone on a Pontiac site said NHRA put the '73 SD455 T/A's in G/SA, at 1st. IF this is true, then it's possible that the H&M '73 T/A WAS SD455 powered, when it was marked G/SA. IF this is so, then exactly when was the hp factor increased enuff to make the SD455 T/A run E/SA ? Any help with exact info on this will be appreciated !

[oldskool]

A guy just posted this on a Pontiac forum.

"...Initially NHRA had the SD in G/SA..."

Does anybody here know if this is true ?

If it is, then the H&M T/A may have been running the SD455 engine, when it was marked G/SA.

But, John Clegg won D/S @ Indy '73, in his '73 SD455 Formy. So, if NHRA began the '73 season classing the SD455 T/A in G/SA, looks like they added hp to the SD455, in just a few months.

Can anybody here check this out, to find the exact dates in '73 when NHRA changed the hp factor on the SD455 combos ?

Could they have maybe begun the season using the factory net rating of 290hp, then increased it very early in the season ? Or ?

Would really love to know the exact timeline of all hp factor changes to the SD455 combos, during the '73 season.

I've posted that the H&M '73 T/A was running a D-port 455, when it was classed G/SA. But, it MAY have been SD455 powered, the whole time.

Anybody here know about this ?

[Terry Witzel]

Originally Posted by jmracing

My name is Jacques Marier from JMRACING from Montreal
July 16 / 2016 at Napierville Dragway at the NHRA National Open with my 1974 trans am SD455 PURE STOCK IHRA car legal at 3838 lbs
11.87 / 113mph qualify 1st (In Canada NHRA accept IHRA race car ) ( 2 time IHRA national record holder in D/PS 2003-2005)

Could you post a picture of your '74 trans am pure stocker?