350/360/330 SBC with E-brock heads - CRICKETS

[Alan Nyhus]

Here's the answer I got from multiple sources at NHRA Technical:

"If you show up with them on a Stocker, you'll be bounced because we know the ports are over the c.c. limit. If we check them and they come up correct, you'll be bounced because we know you've welded them."

I asked why they were still shown as a replacement head for Stock and only one person gave me an answer: "They shouldn't be."

Catch 22.....

[Robert Simpson]

Originally Posted by Alan Nyhus

Here's the answer I got from multiple sources at NHRA Technical:

"If you show up with them on a Stocker, you'll be bounced because we know the ports are over the c.c. limit. If we check them and they come up correct, you'll be bounced because we know you've welded them."

I asked why they were still shown as a replacement head for Stock and only one person gave me an answer: "They shouldn't be."

Catch 22.....

Well then I know of several stockers that have these heads (Non Chevy) and I know the heads were produced larger than stock. They were told, "by tech", they have to be X cc's so they did what they had to do to make them legal size. I don't believe NHRA will look properly at these heads in all divisions... Crazy.

[nhramnl]

Does anybody REALLY think that in these COVID times, there will ever be teardowns, as we all knew them? Hell, there isn't even tech inspection anymore. You write what you want your car to be on your tech card, and your wish is granted. I'm waiting for the first guy to show up with a big-block, claiming it's a 283.

[Mike Taylor 3601]

The 170 cc intake could be reduced enough for most small block stockers..
the 185 not so much

[Daran Summerton]

Can I get the number for the 170 heads. My heads are 168cc. Thanks

[Alan Nyhus]

Originally Posted by Mike Taylor 3601

The 170 cc intake could be reduced enough for most small block stockers..the 185 not so much

Mike, NHRA shows the Edelbrock heads as having 172 c.c. int. port volume and accordingly adds 5 h.p. to the factor if you use them.

However, as supplied by Edelbrock, they are 185 cc intake ports.

[Daran Summerton]

172 is for SS. Stock is same as factory.

[Bobby Lundholm]

Originally Posted by Daran Summerton

172 is for SS. Stock is same as factory.

Dart is the same way. I ordered a set and they were 180cc. I called Dart and talked to their quality control and was told that the tooling has been worn making the runners larger than advertised. I do know if you find an original older set they do match up to NHRA's specs.

[Mike Taylor 3601]

Originally Posted by Alan Nyhus

Mike, NHRA shows the Edelbrock heads as having 172 c.c. int. port volume and accordingly adds 5 h.p. to the factor if you use them.

However, as supplied by Edelbrock, they are 185 cc intake ports.

That's not good...

[james schaechter]

Originally Posted by nhramnl

Does anybody REALLY think that in these COVID times, there will ever be teardowns, as we all knew them? Hell, there isn't even tech inspection anymore. You write what you want your car to be on your tech card, and your wish is granted. I'm waiting for the first guy to show up with a big-block, claiming it's a 283.

They checked valve lift this year at one race. Throttle bodies. Not a piston pull, but some looks