I'm working on an adapter to mount a GM TBI onto a Clifford intake manifold for Pierre. I have some measurements already but still need a few more:

* Distance between the centers of the adapter plate hold-down bolts.

* Height of the top of the adapter mounting face on the intake manifold from the top of the intake runners on the forward top side of the intake.

I would really help me if someone with a manifold sitting on a shelf could take those measurements for me.

Something else that would be a big help would be a pencil rubbing of the adapter mounting plate surface on the intake manifold. It would be great if someone could scan (grayscale format, less than 1 MB) the rubbing and email it to me. If you don't have a scanner, snail mail would be great too.

Thanks,
Frank

Frank,
Sorry, the NL West Baseball division race and school has kept me busy

The distance from manifold to bottom of adapter, at the corner closest to the battery, is 18/64"

I found my gasket, but measuring the boltholes on that wouldn't be very accurate. The divit imprint on it wasn't very clear either. Sorry!

If no one turns up with an unassembled manifold in the next few days, let me know and I'll just remove the throttle body from mine, put a piece of paper over it, and get you an outline of the plenum/boltholes.

If the regular 4 bbl manifold is set up like the Hyper Pak manifold I can give you the measurements on all 4 sets of stud patterns if you like. Just let me know. Heck, maybe I want an adapter for my Hper Pak!! Just let me know. Don

slant6rat, you're lucky you have an older style manifold that you can put the carb/TB on directly without having the hood clearance problems due to the new adaptor pictured above.

I'm almost willing to sell this one since I'm going to drill and tap this manifold for use with a throttle body directly...

anyhow Frank the dimensions you asked for are:

thickness: .505" +/- .002"

holes for the adaptor are at 3.819" approx. each side of the "square"
the squaring diagonal is 5.440" (clifford has drilled the holes as "ovalled slots" and so you can take a good guess at how sloppy this is for "quick" fitting.


good luck,

-D.Idiot

Frank,

Just to be clear, the measurments I gave you in this thread and the other one are for the Howell adapter I drilled out to fit the clifford manifold. That may or may not matter but I just thought I'd let you know.

Slantsixrat. Thanks for posting the picture but I was looking for a different bolt pattern. I already have the measurements for the bolt pattern you have on your intake so it would be easy to make a adapter for you. I think, however, that those adapters are already available.

DusterIdiot. Thanks for measuring for me. However, I pretty sure that the bolt centers would be a "round" number like 3-13/16" (3.8125" or 3.813") rather than 3.819". Could you have a look at your intake and check that the holes are also on 3.819" centers?

Also, from your photo, it looks like the adapter hold-down bolts would be socket-head capscrews. Would you know if the bolt is 5/16"-18?

Pierre. I would like to make the adapter thicker so that the "goldfish" on the throttle lever can clear the intake manifold. However, it would be good to know how much hood clearance you have. If you don't have Play Dough, do you have anything else squishy but not sticky (mashed potatos, etc.) that you could put on the air cleaner lid? Could you also measure how low the goldfish hangs below the top of the adapter? BTW, it's OK that you made you previous measurements from the Howell adapter.

Frank

Better put a lot of butter in those mashed potatoes. Mmmmm, buuuhhhter...

Lou

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Home of Slant6-powered fun machines since 1988

Just out of curiosity (and my stupidity), my motor is .040 over with the head at .010. The head had been cleaned up and blended and I am going to install SI valves. The cam is a MoPar 460/268.

Now heres my wet dream. Why can't I put EFI on my 6 Pak manifold setup? Has this been done or is it as hard as winning the War on Terror ? Tri-power EFI has a nice ring to it.....

First you have to find a setup that can handle what you're about to do (in some cases many controllers need a replicator to get the proper signal to the other TBI's to inject properly...in the case of MPI, you have to figure out how to get the correct TPS from 3 throttle bodies to be correctly interpreted by the PROM so it doesn't go nuts trying to keep up 'fixing' the leaner cylinders because each TB is off a few numbers on the TPS value).

Price is always the big one on doing something, also you have to 'tune it'. EFI takes just as long to dial in as getting the carb and timing right on an exotic setup (if not longer).

mostly your time will be spent finding out who makes a system that would work with the components you are wanting to install (if going the junkyard route...), then coming to grips with the interface and hardware, then you have to make the install and tune it...

-D.Idiot

Frank, the holes in the manifold aren't "square", your number is closest to "the average" of the holes centerlines at 3 13/16"... and they use a 5/16"-18 round headed screw with allen socket which from looking t things with a carb on this manifold is a vacuum leak waiting to happen...

Dang clifford.

Check this out.
http://www.twminduction.com/ThrottleBod ... 00-FR.html


This will solve the TPS sensor hook-up, MAP signal hook-ups and fuel rails. They are not cheap, but for what you are getting they are well worth it if you are serious about this type set-up.

This is what we were running on the Simca.

Tom

DusterIdiot. Thanks for double checking those measurements. I'll have to put some extra clearance in the hold-down bolt holes to account for the slop in Clifford's manufacturing.

Slant6Rat. I am working on mounting TBI units because from what I can tell, most people wanting to try EFI seem to be starting off this way. Building an adapter for OEM TBIs would be the quickest and easiest way. With the TBI adapter, there are a number of ways to go. You could get a package from someone like Howell like Pierre did. You could pull the entire fuel and ignition off a junkyard car and splice it into your car's wiring like Sandy in BC did. Or, you could build a megasquirt system like Dart270 did.

The next step up from TBI is MPFI and this is a bit more expensive and slightly more complicated. The modern OEM MPFI systems don't need to have individual throttle valves at each cylinder and instead use one throttle body at the manifold inlet. Like Tom said, using individual throttle bodies is not cheap.

Even though you already have the 6 Pak manifold, by the time you get a system like that to work, you may very well have spent more than going to someone like RanceEFI and spending $3000+ for their off-the-shelf Offy 4bbl-based system. Tri-power EFI does have a nice ring to it but it might cost as much as winning the war on terror. (Actually, I think the cost of winning the war on terror could have had us all driving 500+ hp turbocharged MPFI hemi-head slant sixes, but that's just my opinion)

Frank

Frank,

The measurements from manifold adapter plate face to runner top is 0.30" on the driver side, and 0.50" on the pass side, both measured toward the front of the motor. Hope this is what you want.

Lou

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