Pontiac 455 hp reduction
 

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

Re: Pontiac 455 hp reduction
 

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.

Re: Pontiac 455 hp reduction
 

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. :o

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

Re: Pontiac 455 hp reduction
 

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.

Re: Pontiac 455 hp reduction
 

Who is running this combo ?

Re: Pontiac 455 hp reduction
 

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.

Re: Pontiac 455 hp reduction
 

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

Re: Pontiac 455 hp reduction
 

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.

Re: Pontiac 455 hp reduction
 

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

Re: Pontiac 455 hp reduction
 

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 ? :confused: