Pontiac 455 hp reduction

[Glenn Briglio]

Could someone explain the hp reduction listed yesterday on the two pontiac 455 combo's.

[Signman]

The reduction that got my interest correct me if am misunderstanding the 1989 TPI 350 with the 128 head in a Camaro gets a 4 HP gift (270 for years now 266) but will be removed from the guide 1/1/2023. Someone must be running it but not for log.

[oldskool]

Originally Posted by Glenn Briglio

Could someone explain the hp reduction listed yesterday on the two pontiac 455 combo's.

Don't think very many will have to worry about that change. That was a rare engine, SD455.

http://www.classracerinfo.com/Engine...0&MAKE=Pontiac

As far as I know, there is only one '73 Stocker & one '74 Stocker running that engine. Don't think those 2 will be in enuff heads-up runs in a season, to cause the other brands much trouble.

Considering the rarity of those heads, & current price, I don't think there will be a rush to use this engine.

But hey, what do I know.

Here's a 455 which I think could really use a big reduction. It's the '76 455. It has HUGE chambers, resulting in LOW compression, & from what I've read, poor flowing ports. But, from what I gather, somebody has to build one 1st, run it for a while, THEN ask for a reduction. I don't look for that to happen. I've never seen or heard of a '76 Pontiac running that engine. In fact, I've only seen ONE '76 Pontiac Stocker, of any kind.

http://www.classracerinfo.com/Engine...7&MAKE=Pontiac

[Glenn Briglio]

Originally Posted by Signman

The reduction that got my interest correct me if am misunderstanding the 1989 TPI 350 with the 128 head in a Camaro gets a 4 HP gift (270 for years now 266) but will be removed from the guide 1/1/2023. Someone must be running it but not for log.

That someone is me. I got hp removed and Nhra looked into the aluminum head in a Camaro. There was never this combo. It was an error by Nhra when put in in 1989. But still get to run it for this year.

[Glenn Briglio]

Originally Posted by oldskool

Don't think very many will have to worry about that change. That was a rare engine, SD455.

http://www.classracerinfo.com/Engine...0&MAKE=Pontiac

As far as I know, there is only one '73 Stocker running that engine. Considering the rarity of those heads, & current price, I don't think there will be a rush to use this engine.

But hey, what do I know.

Who is running this combo ?

[oldskool]

Originally Posted by Glenn Briglio

Who is running this combo ?

It's no secret, since the car now has SD-455 on both sides of the shaker hood scoop. The '73 is a baby blue Firebird Formula, owned by Michael Brand. He & his wife both drive it.

I think they're still in div 2.

[Bobby DiDomenico]

Interesting. Was going to ask how a car gets deleted.

[Glenn Briglio]

Originally Posted by Bobby DiDomenico

Interesting. Was going to ask how a car gets deleted.

Car isn't deleted. Combo with aluminum head gets deleted because gm never made it. Nhra made the mistake of putting it into their books.

[Glenn Briglio]

How does the Pontiac 455 get a reduction when the engine had an increase from factory rating?

[oldskool]

Originally Posted by Glenn Briglio

How does the Pontiac 455 get a reduction when the engine had an increase from factory rating?

Sorry, but that makes absolutely no sense to me at all.

I can name several Pontiac engines that were increased by NHRA, then later reduced by NHRA.

So, are you trying to say that once NHRA has increased the hp, they can't later come back & reduce it ?