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Another possibility is to use the Ford CFI throttle body instead of the GM TBI. The CFI has a Holley 2V pattern. Matching the GM TBI pattern is a pain. I'm sure there are other throttle bodies out there with friendlier patterns than the GM, but less well documented.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
Does the CFI use the small venturi pattern? I'm going the GM route just because I already have the parts but the adapter plates all appear to be in the $160+ range. What type of setup did you use to make the big holes?
82 J10
77 J10 Golden Eagle 401
88 GW
You know it's bad when your car is on the EPA's 10 most wanted list!
Might want to inquire at a machine shop to see how much it would cost to punch two big holes. You can use the gasket as a template for the other three, but heck, while it's there, have the machine shop punch and thread the other three, too.
My prototype is being developed at the CNC shop right now.
It should be just like my others at $80.
The 2 big holes need to taper in to allow the transition from the 1 11/16 TBI to the 1 1/2 BBD bore size.
The 4 mounting holes are very close to the bores.
I have 1 that's 3/4' thick but I'm trying to keep all of mine at 1/2" for hood clearance in different vehicles.
Last edited by Bill usn-1 on Thu Jan 16, 2014 4:17 pm, edited 1 time in total.
Grand_Wag_85 wrote:Does the CFI use the small venturi pattern? I'm going the GM route just because I already have the parts but the adapter plates all appear to be in the $160+ range. What type of setup did you use to make the big holes?
AFAIK the CFI throttle body is the same pattern as the Motorcraft 2Vs that the AMC V8s use, and same as the Holley 2V. I'm just relying on the info from Will Marsh's series about putting one on the manifold of his Travelall. http://www.binderplanet.com/forums/show ... hp?t=53524
Discussion at the link above covers what I did to make the adapter. I was given the aluminum, and I used my sawzall to cut it to the approximate size. I cleaned up the edges of the adapter with my stationary disk sander. The pattern was laid out using the gaskets for the manifold and the TB.
We have some large drill bits at work, and I drilled the largest hole I could (7/8"? don't recall) through the area overlapping the two patterns. Then I used my die grinder and a non-ferrous metal bit to enlarge the holes asymmetrically to match the pattern on each side.
Bill usn-1 wrote:...
The 4 mounting holes are very close to the bores.
I have 1 that's 3/4' thick but I'm trying to keep all of mine at 1/2" for hood clearance in different vehicles.
Yes. The bolt holes partly overlap the TB bore. To anyone that makes their own adapter, I suggest you do not use the fancy countersunk bolts that I used, and instead use socket cap screws like the Howell adapter.
My adapter is 1" thick ... but that's the material I had. We'll see how it works re hood clearance. I did some rough measuring at the time, but I don't recall how it came out. I'll look at it again this weekend.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.
Sorry Tim I just briefly buzzed thru your thread and musta missed those parts. My head is still spinning from all the reading on BP.
Ethan, dark side indeed! My goal is to do the speed limit on 70, that's it really...LOL!
Bill, any idea on when it'll be ready? Don't think hood clearance will be much of an issue for my J10. I can stick a camera in there and shut the hood if you need. There's a 32/36 on there right now.
82 J10
77 J10 Golden Eagle 401
88 GW
You know it's bad when your car is on the EPA's 10 most wanted list!
My CNC shop said about 2 weeks.
Keep in mind I design to work on many applications. The AMC 6 was also used by IH and used in passenger cars.
So I have to keep all applications in mind as I design them.
Isn't the TBI an offset 4 bolt pattern?
I did a dodge TBI on a 4bbl manifold adapter for a guy with a 5.2l when he changed to an aftermarket manifold.
There is also a small and large TBI bore just like the GMs.
My BBD prototype is in the mail from my CNC shop so I should have it soon.
That looks like the MPFI throttle body like I showed in the MPFI conversion using the 7427 PCM with 4l80e.
That is different from the Mopar TBI throttle body with the injectors like the GM TBI.
Are you talking TBI or MPFI.
I have done adapters for both.