wrong spec submitted by MOPAR

[Irv Johns]

Originally Posted by Pvt Parts

Hey all those things are understandable but the bottom line is that this is NHRA drag racing, not Mopar factory racing and if the parts don't meet the NHRA specs, they are not legal.

In my case there were no piston specs for the 392 till March of this year. My engine was built with Diamond pistons as per NHRA specified with NHRA Logo and Diamond pistons engraved on top (early Drag Pak pistons had no engraving on top that was added after the first ones went thru teardown). There was no part number or ring spec in book til this March. My engine builder only had what was available for specs last June when my engine was built. He trusted Diamond to build pistons per NHRA as they were a approved vendor.

[Alan Roehrich]

Originally Posted by Irv Johns

In my case there were no piston specs for the 392 till March of this year. My engine was built with Diamond pistons as per NHRA specified with NHRA Logo and Diamond pistons engraved on top (early Drag Pak pistons had no engraving on top that was added after the first ones went thru teardown). There was no part number or ring spec in book til this March. My engine builder only had what was available for specs last June when my engine was built. He trusted Diamond to build pistons per NHRA as they were a approved vendor.

Irv, are you saying NHRA allowed you to race a car with an engine that did not have clearly defined specifications in the blueprint guide?

How did they expect to properly inspect an engine at tear down if there was no published specification, or even an accepted part number?

The blame for that lays solely at the feet of NHRA.

[Andys dad]

Not unusual for the newest cars

Our V10 was the same deal - that is why I dislike someone accusing the engine builder of being stupid or us not doing what we should have

The engine builders did the best they could and so did we

BTW so did the factories and NHRA

Now all of the jealous haters can jump on that but I will say "Elvis has left the building" - LMFAO

[Alan Roehrich]

Originally Posted by Andys dad

Not unusual for the newest cars

Our V10 was the same deal - that is why I dislike someone accusing the engine builder of being stupid or us not doing what we should have

The engine builders did the best they could and so did we

BTW so did the factories and NHRA

Now all of the jealous haters can jump on that but I will say "Elvis has left the building" - LMFAO

No, the OEM and NHRA did not do the best they could. That's a cop out.

I've been through the approval process for various approved Stock Eliminator parts. Never once did NHRA offer to let me run a part that either had no spec, or had no published spec, or did not have the required approval number on it. In fact, I had two new sets of approved pistons with the correct part number, in my hands and ready to go into the engines, when NHRA rescinded their approval over 0.005" of dome height, when the piston did in fact have 0.001" less dome height than the maximum allowed. NHRA came back and told us the pistons were not approved, had to be remade, and resubmitted. I waited 6 months to get my pistons the first time, then 3 more months. Both times NHRA had my parts in their possession for an extended period of time.

So no, Ron, I do not buy the idea that NHRA and the OEM did the best they could. They held me and my piston supplier to a far higher standard. I never got to race a part that wasn't listed and did not have a spec in the guide. No, they best they could do is for everyone to go through the same process and be held to the same standard.

[Irv Johns]

[QUOTE=Alan Roehrich;324543]Irv, are you saying NHRA allowed you to race a car with an engine that did not have clearly defined specifications in the blueprint guide?

How did they expect to properly inspect an engine at tear down if there was no published specification, or even an accepted part number?

The blame for that lays solely at the feet of NHRA.[/QUOTE

Not exactly , we didn't find that out till today there were no specs on Diamond pistons in the 392 until March
all the other specs were posted,
ie: bore, stroke , valve size, cam, deck, head gasket thickness, throttle body size.rockers .

[art leong]

Originally Posted by Alan Roehrich

Irv, are you saying NHRA allowed you to race a car with an engine that did not have clearly defined specifications in the blueprint guide?

How did they expect to properly inspect an engine at tear down if there was no published specification, or even an accepted part number?

The blame for that lays solely at the feet of NHRA.

Alan have you ever seen them look at a turbo? I have and I haven't seen anyone even look at where you could modify it to gain an advantage. They don't have any numbers I even gave them a turbo to take back and measure but it wound up in the trash.

[David Barton]

Originally Posted by Irv Johns

In my case there were no piston specs for the 392 till March of this year. My engine was built with Diamond pistons as per NHRA specified with NHRA Logo and Diamond pistons engraved on top (early Drag Pak pistons had no engraving on top that was added after the first ones went thru teardown). There was no part number or ring spec in book til this March. My engine builder only had what was available for specs last June when my engine was built. He trusted Diamond to build pistons per NHRA as they were a approved vendor.

We built a 392 last year but chose not to run it because there was no approved piston. We were told that if we ran a standard bore size it would have passed as a factory piston. But since we bored it out there was no way it would pass because there was no approved piston listed.