8BA loadamatic dist. with 2GC carb question

The 4 bolt Merc intake throttle bores do not match the 2GC carb throttle bores. So I have an old 2GC base and I just bore the intake to match. This lets the engine get the full benefit of the carb. Besides the mis match would prevent the carb from operating right?? Some guys jur blend the bores in with a grinder. But???
 
Thank you. That is what I figured you were referring to. Its another detail that will need my attention. The fellow I recently got the truck from complained that the throttle would 'stick open'.
 
I have done the same thing. Unless you have the proper equipment it is not a trivial task. I used something called a "Rotabroach" I got from an outfit called "Blair Equipment". I mounted it in my benchtop drill press and used an old 2G base bolted to the manifold as a guide. It worked pretty slick; I was able to enlarge the throttle bores all the way to the base of the plenum. I have done both aluminum (Canadian) and cast iron manifolds this way.

https://shop.blairequipment.com/Rot...MIyLKo_MnD2wIVwcDACh31bQeXEAAYASAAEgKIgfD_BwE
 
Are these late 4 bolt 8BA intakes fairly available? Obviously I have the one that's on the truck now but swapping manifolds, having another manifold all ready to go before the tear down, would certainly speed up the process.
 
They're really 8CM or 1CM, not 8BA. All Mercury's from '49-53 had them, so they're still around. I have seen iron ones on eBay in the $50 range. I think swap meets and wanted ads on the H.A.M.B. or here might get one cheaper. I'm always got an eye open for the aluminum version, but haven't seen one in years (I'm not looking real hard though as the weight difference is a little over 10 pounds). I think I paid $120 for the last one I bought. I did the aluminum one with my benchtop drill press and it wasn't bad. I did the last cast iron one on my new floor model drill press and it wasn't too difficult either. Just make sure you get it aligned correctly and clamped down real good. If you need the 2G base to use as a guide, let me know.
 
I was searching for a Merc manifold for a friend, getting tough to find one in either aluminum or c.i. that isn't roached at the gen mount, rusted to hell, or butchered.

I run my 2G without any grinding of the Merc manifold, no problems. I use two gaskets for heat isolation (aluminum manifold) and being a truck, I'm not winding it out to 5,000 RPM, so any flow benefit would be hard to find.
 
Didn't some of the later aftermarket Stromberg 97s have a blended vacuum signal port designed for use with the Load-a-matic dist ?

Has anyone determined if they work effectively?
 
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