Center/Front/Rear Mount Adapter

[bgott]

If I can remember to snap some pictures I have a square bore to 2" bore Marine TBI adapter off a 405 HP Mercruiser 502. It is approximately 2" tall, and has a tapper all the way from the top of the 2" bore to the spread bore oval flanges.

Fast I assume this is a center mount setup?

My spacer is designed to be .75" minimize the height of the breather when it's all together. Don't think I will run into hood clearance issues with a full size truck, but don't want to make it gargantuan either.

[dave w]

Pics are "D Shaped / Port Volume Matched" square bore TBI adapter plate. Send me a PM for the STEP file. Original file is .pkg format.

TBI_Adapter_SquareBore_Port_Matched_01.jpg

TBI_Adapter_SquareBore_Port_Matched_02.jpg



dave w

[bgott]

Cut this out, based off of dave w. design last night. 6061 Aluminum.

Fits my performer RPM nicely. I didn't bother to do clearance work from the bottom side, so it isn't truly "port matched" in my case, but I think will work nicely for me. Still need to polish the tooling marks out of the bore taper, just didn't have time last night. IMG_1664.jpgIMG_1669.jpgIMG_1666.jpg

[dave w]

dave w

[Fast355]

Honestly I would not polish it and leave it slightly rough. I might even go so far as to take a small cuttoff wheel and a dremel and purposely carve ridges in it. The reason behind that is so it will help atomize any raw fuel droplets that might try to collect and run down the bore of the spacer. I often add the same grooves on the intake manifold ports for the last 2 inches of each. Liquid fuel does not burn, vapor burns.

[geewhiz]

PM sent

I'm putting a '87 7.4L TBI with the factory adapter on an amc 360, with Edelbrock Performer carb manifold.

Thanks

[bgott]

PM sent

I'm putting a '87 7.4L TBI with the factory adapter on an amc 360, with Edelbrock Performer carb manifold.

Thanks

As the design belongs to Dave I am not at liberty to produce these. I will say I have had it on the engine now for 2 years or so without any issues and seems to work fine. I would recommend Dave get them produced and market the design but in truth the amount of machining required may make it not feasible in terms of price to demand. When you consider cost to produce would likely be around $300-400 per part youre halfway to buying a holley sniper at that point.

[dave w]

As the design belongs to Dave I am not at liberty to produce these. I will say I have had it on the engine now for 2 years or so without any issues and seems to work fine. I would recommend Dave get them produced and market the design but in truth the amount of machining required may make it not feasible in terms of price to demand. When you consider cost to produce would likely be around $300-400 per part youre halfway to buying a holley sniper at that point.

The adapter could be affordably manufactured Off-Shore (at or about the Trans-Dapt prices . . . https://www.hedman.com/carb-to-efi-adapters), minimum production run of 1000 units. My pocket$ are not that deep. Trans Dapt isn't buying my idea either

dave w