Adapter plate ?

[Binderman]

First off I know squat about aluminum, other than it is fairly easy to work/machine and that I can't weld it without making a mess. Will 6061 plate work for the TBI adapter plate? Someone recommended Billet, but I have yet to find any. The cast plate sells for less, but i figure it is not any good for this application.

Secondly I figure I need a 6x5 inch piece? How big was everyone elses? Rough measurement?

There is about 1 1/2 difference in air cleaner flange height from the TBI to the carb so I thought I would go with 3/4 or 1 inch plate. Any yes or no's.

What is the options for air cleaners, will my choice in adapter plate thickness come back and kick me in the butt when I go to look for an a/c assy?

I found aluminum pieces on e-bay (dah) for sale and thought I would go that route as to bumming a piece from someone. Thanks for the offers guys!!!!

Sorry for all the questions.

Maybe I can document my adapter build and help out with that part on the info page? Bill your probly on top of this already, but thought I would offer anyway.

[Eagle-Mark]

Did I forget to tell you I got you a piece?
Wondered why it's still here on the bench...

6 1/4x5 1/2 inch thick $10 from CDA metals plus shipping if you want it.

I used a air cleaner off a pickup truck. But when I dropped the body lift it would not clear. So now I have one off a 93 Chevy Caprice 9C1 cop car. I think they are the same on civilian caprice as well. Much lower and the cold air snorkel looks like it will be perfect going out just over the heater into the cowl area. The hot air intake will also run down to the exhaust manifold for winter. Here in Idaho that is an issue.

[Binderman]

Check or money order? Figure the shipping and consider it sold!!!

Did ya sell your truck? Don't see it listed anymore or I just missed it.

Thanks!!!!!

[Eagle-Mark]

My wifes Scout sold to a friend of our Off Road Coordinator so we got another member too.

I will PM you on the plate.

[Eagle-Mark]

Here's a link to the plans someone made (I wish I knew who to give credit for these).
Only difference is the GM TBI off the 305 and 350 Chevy motors is smaller bores than the Holley.

http://www.justinternationals.org/fu...dapt-plate.doc

[ROS]

Thank you very much for the link to the adapter plate blueprint. I will check with my buddy and see what his machine shop will charge for them to be made.

ROS

[Eagle-Mark]

Remember that this is for a two inch throttle body!
Most of us use the less expensive more pletyful 1 11/16 TBI

It soesn't sound like that big a deal but when you start to machine it changes from a two angle design to a three angle design and is much harder.

Unless you do it yourself, have a machine shop or a freind that owes you favors in a machine shop I don't think it would be cost effective to re-invent the wheel.
Affordable Fuel Injection has them for about $60.

http://www.affordable-efi.com/

[Bill usn-1]

Summit
HLY-17-47 TBI Adaptor (2300 2 BBL Flange To TBI Flange) $79.95



They also have the 4 barrel version for $39

[Binderman]

"They also have the 4 barrel version for $39"

Thats typical!! More material and nearly half the price of the 2 barrel. Guess total sells of each reflect the cost. Crazy world!!

[Alan Chatterton]

4 hole cheeper

I believe it is cheeper because they wouldnt have to taper the hole, just drill straight through.

[moosebrew]

Just a caution on that blueprint

Hey just wanted to caution you on that blueprint, its not real clear on the labeling but the three holes that the TBI bolts too have to be drilled with an "F" drill I believe so they can be tapped to 5/16, the outside holes are drilled 5/16. This confusion almost cost me another round at the fabbers. The machine shop I had mine cut out at couldn't make the tapperd slope in any way except to do it by hand and that gets spendy. So I had them cut the smaller hole and I boared it out myself. Overall for the laber and work, honestly $60.00 from AFF isnt a bad price at all.

Just my thoughts
Mark