I just got a slant 6 with an aluminum intake and wonder what it came on originally. The cast # is A2 2121675 and has a date of 1-16-60. Also it is a single barrel intake.

Wow, that's a very early intake. Wasn't the /6 first introduced in the '60 model year?

Yep, 2121675 is one of the casting numbers for the 1960 aluminum 1bbl intake. These intakes have a slightly different carb mounting flange compared to the '61-up units (no PCV vacuum port on the '60 intakes) so you have to be a little bit careful when installing a carb to make sure you provide PCV vacuum without causing a vacuum leak. Casting quality on these intakes is generally good, but sometimes you find significant internal corrosion in some of the runners.

They got these 1960 intakes from nine different foundries. Some of them were semipermanent-mould castings, others were sandcast. Is this engine of yours a 170 or a 225? What'd you get it out of?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

The intake is not on the original engine. A friend of mine rebuilt the engine in his 70 dart swinger in the mid 80's and put this intake on it. I don't know where he got it. He rolled the car on an icy morning and had it in the back yard until a month ago when the county told him to get rid of the "eyesores". He said he put about 10k miles on it before the wreck, and when they parked it he poured ATF down the carb (wide open) while running until it died. He said that would help the valves from sticking. It has been about 20 years of sitting and I could grab the crank pully and move it. I will still take off the valve cover to check the valves/pushrods. I will probably need to change the valve springs that have been compressed for so long.

Can the 65 Dart carb gasket be used as a template to locate the PCV hole location in the manifold, offset the hole slightly more away from the throttle opening area, & drill a slightly smaller hole than the gasket to make this manifold work for a 65 Dart stock carb 3058 condition?

I also noticed that a 85 truck alum. manifold didn't have the PCV valve hole provided either....same problem exists on that application?

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1965 Dart 110k, 225, Carter BBD Super Six, 2 1/4 single exh., sbp manual scarebird front disc, 7 1/4 rear 2.94 sure grip, 14 x 4.5 OEM wheels, 833 OD with hyd. throwout bearing, HEI, electric fan, ram air/heated air, Accusump. http://plymouthcarclub.com/

Sorta. The PCV hole in that carb gasket overlaps the outer edge of the carb flange on the '60 (and '85) intakes. You can use a carb with the PCV passage on the passenger side (some of them got it in '63, more of them got it in '68, all of them had it by '70) or modify a carb with driver-side PCV and leave the manifold alone. The mod is almost straightforward; you basically continue the PCV passage inward towards the inner wall of the throttle body BUT you must drill the inner half of this hole at a downward angle so that the entirety of it is below the closed throttle plate. If you bridge the throttle plate with this hole you spoil the carb.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Understand problem
Took gasket, put bolts thru it into manifold, pushed it up against side of bolts in the worst direction, & spray painted hole for driver's side PCV carb connection
Result: hole is barely 1/32 from edge of flange

Seems if this gasket is right to satisfy no leak at carb flange & a different gasket is used to satisfy no leak at manifold flange then the problem shifts to the gasket interfaces.

Gasket I used for the check was Felpro 60125 which is the 5/16 thick gasket to address hot start issues.

Also examined possibilty of drilling carb to a point below the throttle plate...not much room(1/8 to 3/16) so the hole couldn't be large. Perhaps a slot would do in the carb flange about 1/8 deep & 1/4 wide?

Got a felpro gasket number for a 60?

Any feasibily to pulling the pcv at a vacuum connection into the intake manifold instead of fooling with the carb....not in the #6 runner but right under the carb with a new drilled & tapped hole?

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1965 Dart 110k, 225, Carter BBD Super Six, 2 1/4 single exh., sbp manual scarebird front disc, 7 1/4 rear 2.94 sure grip, 14 x 4.5 OEM wheels, 833 OD with hyd. throwout bearing, HEI, electric fan, ram air/heated air, Accusump. http://plymouthcarclub.com/

Resolved the issue of a potential leak due to the difference between the aluminum intake smaller flange OD & the 1965 1920 Holley standard gasket with PCV valve hole falling at the edge of the aluminum flange (what a mouthful!!)....

I used a gasket from a 50's flathead positioned up against the aluminum intake flange & the 1965 1920 holley thick flange gasket touching that flathead gasket & the holley. The Flathead gasket has lot's of meat in the right areas......all too simple!

Another step was to notch a portion of the thick stock 1920 Holley gasket to align with the flathead gasket slots so that the PCV vacuum circuit had access to the intake manifold vaccum

The fix was done with the proper selection of gaskets.....no drilling of any metal required....

It's working fine after enough test time

I have 3 good size pictures of the gasket fix if any are interested in a simple fix....just send me a PM with your email.

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1965 Dart 110k, 225, Carter BBD Super Six, 2 1/4 single exh., sbp manual scarebird front disc, 7 1/4 rear 2.94 sure grip, 14 x 4.5 OEM wheels, 833 OD with hyd. throwout bearing, HEI, electric fan, ram air/heated air, Accusump. http://plymouthcarclub.com/