Gofish
Well Known Member
I’m building a tri-power 348 hooked to a 700R4 in a Model A and have more vacuum needs than ports on the engine. The center carb base is cast iron, the others are aluminum. I’m short one large-diameter port. I have ports for the distributor advance, transmission (for lockup), and PCV on the center carb. What I’m short is another large one for either the PCV or the brakes
I don’t want to combine the brake booster and PCV hoses, so I’m thinking of drilling and tapping the intake manifold for another 1/4 NPT fitting. This would be for the brakes and maybe a more convenient source for the trans. It seems pretty straightforward to do this behind the rear carb, as generally shown with the pencil in the top photo. It’s plenty thick there too (the other photo).
So before I get out the drill, how about some better ideas? I’m trying real hard not to be a cut first then measure again guy.
I don’t want to combine the brake booster and PCV hoses, so I’m thinking of drilling and tapping the intake manifold for another 1/4 NPT fitting. This would be for the brakes and maybe a more convenient source for the trans. It seems pretty straightforward to do this behind the rear carb, as generally shown with the pencil in the top photo. It’s plenty thick there too (the other photo).
So before I get out the drill, how about some better ideas? I’m trying real hard not to be a cut first then measure again guy.