Technical Th400 vacuum

I have a th400 and a tunnel ram with no vacuum ports. Question where do I get my vacuum from for modulator valve. Thanks.

 

What carbs are you running? You should be able to tap into a vac port for manifold vac on one of the carbs or a single carb if that is your set up.

 

Single holley 650 dp.

 

There should be a vac. port for manifold vac. on the front left side.

 

If there are no ports on the carburetors may be consider spacer plate under the carburetors with a vacuum port. Or, convert the 400 to full manual and forget about the vacuum.

 

You could also find a spacer plate that has a vacuum port in it. Some 60's Ford came from the factory with them. Aftermarket ones are available.
I was typing this while @Kevin Ardinger was posting!

 

The 650 dp should have the vac. ports in the front . Rht side is timed vac. lft is manifold vac.

 

Early 58 to 60 chevys had hollow mounting studs.
1959-62 CORVETTE & CHEVROLET HOLLOW WCFB ...
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1959-62 CORVETTE & CHEVROLET HOLLOW WCFB CARBURETOR 1959-61 WCFB [EXCEPT 2X4], 1962 300HP AFB APPLICATIONS - INSTALLATION STUD KIT FOR VACUUM HOSE -.

 

drilling and tapping a hole in the intake is apparently too much work....

 

Walls of a tunnel ram manifold in some spots are awfully thin to drill & tap , easiest way out is a spacer plate IMO.

 

2old2fast's idea eliminates removal of the manifold to avoid drill chip contamination. Factory uses direct manifold vacuum, seems to work, so....