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Where to put vacuum port in Indy single plain ?? #3235015 05/26/24 08:30 AM 05/26/24 08:30 AM
Joined: Oct 2005 Posts: 8,911 Ontario, Canada S Stanton OP Don't question me!
Stanton OP Don't question me! S Joined: Oct 2005 Posts: 8,911 Ontario, Canada	Wondering where others have drilled and tapped for a vacuum port on a big block Indy single plane intake. I'm thinking the crotch between the runners at the back of the plenum id too tight to get any sort of fitting in there. Photos if you have them. Thanks,

Re: Where to put vacuum port in Indy single plain ?? [Re: Stanton] #3235021 05/26/24 09:55 AM 05/26/24 09:55 AM
Joined: Aug 2003 Posts: 43,311 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,311 Bend,OR USA	What size and what use? If power brakes I would use one on the carb if available if for vacuum advance ported vacuum outlet on the carb Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Where to put vacuum port in Indy single plain ?? [Re: Stanton] #3235031 05/26/24 10:56 AM 05/26/24 10:56 AM
Joined: Jan 2003 Posts: 2,937 A shed in England Tig master
Tig master Joined: Jan 2003 Posts: 2,937 A shed in England	Originally Posted by Stanton Wondering where others have drilled and tapped for a vacuum port on a big block Indy single plane intake. I'm thinking the crotch between the runners at the back of the plenum id too tight to get any sort of fitting in there. Photos if you have them. Thanks, On my 3X I was going to drill and tap for an 1/8th NPT port under the carb pad either right or left. This was to log manifold vacuum.I was going to use a right angle -3 fitting and some -3 line to the sensor which is 1/8th NPT male. It could also be done on a 1" spacer, if you have the room. The sensor was going to be mounted off the engine. I still haven't got round to it as I realised I'd got the wrong sensor and we switched to a T/R a few years ago. It's way easier to pick a spot on a T/R though. '74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03

Re: Where to put vacuum port in Indy single plain ?? [Re: Stanton] #3235034 05/26/24 11:07 AM 05/26/24 11:07 AM
Joined: Jan 2003 Posts: 1,768 Windsor, ON, Canada D Diplomat360 top fuel
Diplomat360 top fuel D Joined: Jan 2003 Posts: 1,768 Windsor, ON, Canada	Not the Indy intake application that you are asking about, but on my W2 stroker and Victor I put one at the back under the carb base.

Re: Where to put vacuum port in Indy single plain ?? [Re: Diplomat360] #3235069 05/26/24 02:39 PM 05/26/24 02:39 PM
Joined: Jan 2003 Posts: 20,773 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 20,773 Eagle, Idaho	Some brands of carburetor spacers have tapped holes for fittings and/or a pvc port tube already in them. If your going to run a spacer of some type that may be an option?

Re: Where to put vacuum port in Indy single plain ?? [Re: Neil] #3235097 05/26/24 05:40 PM 05/26/24 05:40 PM
Joined: Oct 2005 Posts: 8,911 Ontario, Canada S Stanton OP Don't question me!
Stanton OP Don't question me! S Joined: Oct 2005 Posts: 8,911 Ontario, Canada	Carb? What carb ?!? EFI !!! Carb spacer ... uh-uh, ain't gonna happen. The port is for 1) PCV and 2) MAP sensor I think Diplomat360 has the answer ... looks like that spot will work on mine as well. Last edited by Stanton; 05/26/24 05:43 PM.

Re: Where to put vacuum port in Indy single plain ?? [Re: Stanton] #3235105 05/26/24 06:40 PM 05/26/24 06:40 PM
Joined: Jan 2003 Posts: 20,925 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,925 A collage of whims	Diplomat360's location seems best to me. For a brake booster, I'd locate it at the rear.

Re: Where to put vacuum port in Indy single plain ?? [Re: topside] #3235107 05/26/24 06:48 PM 05/26/24 06:48 PM
Joined: Oct 2005 Posts: 8,911 Ontario, Canada S Stanton OP Don't question me!
Stanton OP Don't question me! S Joined: Oct 2005 Posts: 8,911 Ontario, Canada	Quote For a brake booster, I'd locate it at the rear. I only had a front photo of the motor - the port will be in the rear.

Re: Where to put vacuum port in Indy single plain ?? [Re: Stanton] #3235120 05/26/24 08:40 PM 05/26/24 08:40 PM
Joined: Jan 2003 Posts: 20,925 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,925 A collage of whims

Re: Where to put vacuum port in Indy single plain ?? [Re: topside] #3235385 05/28/24 03:32 PM 05/28/24 03:32 PM
Joined: Mar 2008 Posts: 861 lancaster,california johnnycuda super stock
johnnycuda super stock Joined: Mar 2008 Posts: 861 lancaster,california	I drilled and tapped my Indy 4150 single plane where Diplomat360 shows his, I did mine 1/4" NPT with a 1/8" hose, just wanted to run a vaccum gauge. 1970 'Cuda,Lime Light,499 Indy S/R's 10.70's @125,street driven ALOT! 1966 Barracuda 360,now a 5spd,Hemi Orange,Hot Rod Air, New daily driver-2003 Ram 2500 Cummins 5.9 '69 Valiant 2-dr, sleeper! New project---1938 Dodge truck, plan is a 360 with a A500, AC, Calvert rear susp., rack and pinion front with coils.

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