Z Intake Plenum Constructoin

[pballance]

Found the picture

[Ron Earp]

What is that orange piece that all the stuff is attached to and has two pipes on it?

[pballance]

What is that orange piece that all the stuff is attached to and has two pipes on it?

That is the factory backing plate and stock stacks!

Steve, That is the picture Keith sent me. Mine will be similar but my fab skills aren't as good as what is in the photo's.

BTW, that is one of Katman's motor's Notice the cool oil pan!

[spawpoet]

If anyone needs the stock backplates we have several layign around the shop you could have cheaper than from ebay (was going to ebay all but 1). I don't know if there were differences between the 240 and 260 backing plates though. Where can the pipercross filter be found???

[pballance]

Got mine here http://www.truechoice.com/prodinfo.a...er=PIP%20C603D
But I sure don't remember paying that much.

[Mike Mackaman]

The easiest way to tell the 240 and 260 apart is that the 240 air horns are round, the 260 are rectangular. Other than that they are both orange. not sure about size. The 260 also bolts on with three fasteners per carb.

Mike

[Parrish57]

OK... I got a response from Topeka yesterday. I sent an email to John Bauer, a tech assistant. The email had a photo of a stock air cleaner box backing plate, a modified backing plate that retains the stock air horns, some modified stock air horns, and some aftermarket replacement air horns. I gave a written review of the rule and arguments for/against each prep level based on the GCR.

After reviewing my submission he called me to discuss it. To put it in a nutshell, he said that his interpretation would be that the stock air cleaner may be modified, but if you want to run velocity stacks you have to use the stock ones. He didn't fell like the second sentence gave any wiggle room on that. He did say that he thought that it would be OK to cut the velocity stacks from the backing plate and use them with any air filter you choose.

Note that this is not a formal "rules clarification". So without that $250 piece of paper it would be up to the stewards interpretation if someone had heartburn with your setup and protested you. It's good enough for me. I'm comfortable with my modified air box and OEM velocity stacks.

[Parrish57]

Paul... Very cool. Nicely done.

When I first started I was told the same thing that Katman said, except I was told that you could only use velocity stacks if you used the stock part. I was not told that you have to have the entire unmodified stock air box backing plate. That seems to contradict the rule allowing you to modify the air cleaner box. If that is the case, mine is "non-compliant". I have a call in to Topeka. I'll let everyone know what I hear.