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Old 12-23-2019, 02:29 AM
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Default Single-plane Tri-Power?
I've put a lot of miles on Tri-Power Pontiac engines, but all with factory dual-plane manifolds. I often wonder how a single-plane Tri-Power manifold would perform (I think I asked on this forum quite a while ago but didn't get answers). I recently noticed that the Offenhauser 360 Equa-Flow manifold (1968 era) was a single-plane and available for three 2-bbls and (I think) available for Pontiac. Anybody here ever run one?

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  #2  
Old 12-23-2019, 11:37 PM
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I had two of the earlier 64 head Offy Tri-Power Intakes.
The intakes were actually pretty good about airflow thru the short runners and divided plenum. I cut one apart one time and there were a couple of "windows" between the two side by side plenums. So they fit the 360 manifold definition.
Not sure what the application was on the one I cut apart. Maybe sb chevy or sb ford.
Many many years ago.

The Pontiac intake I flowed on the SF 1200 flow bench, flowed about 270 cfm thru one short port.

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  #3  
Old 12-24-2019, 01:22 AM
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Is the "360" manifold less satisfactory for everyday street use (mostly center 2-bbl) than a dual-plane manifold?

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... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926}
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Old 12-24-2019, 06:55 PM
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The 360 manifold would operate like a 780 Holley 4 BBL's primaries on a single plane intake. A bit soft on the bottom end and maybe a bit more tuning required vs the calibration the Rochester Engineers put into the Factory Tri-Power 2 BBL but still not a big issue vs not running one of the things.

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Old 12-25-2019, 01:34 AM
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Thanks. Merry Christmas.

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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926}
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Old 12-28-2019, 01:49 AM
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I "thought" that Offy made the 360 3-2bbl manifold because their ad in January '68 Hot Rod said "...1, 2, and 3 carb" versions. However, after January they never again mentioned a 3 carb 360 manifold, just single- and dual-quad.
So... I suspect that nobody ever made a single-plane 3 2-bbl manifold for Pontiac... and maybe not for any engine.

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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926}
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Old 12-28-2019, 01:57 PM
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I don't know if you saw this but if not here you go the only single plane Tri-Power I know of for a Pontiac
https://headsandmanifolds.wordpress....3000-7500-rpm/

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Old 12-28-2019, 10:03 PM
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Jack, if you cut the top off of a 64 type Offy Tri-Power Intake I believe you will see the "communication windows" that basically make it act like a dual plane 4 bbl intake but with the plenum divider removed. Both barrels of each 2 bbl carb get the same signal at the same time.

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Old 12-29-2019, 03:23 AM
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Quote:
Originally Posted by brut4s View Post
... the only single plane Tri-Power I know of for a Pontiac...
Thanks for the link- I had not seen that. I'm sure Dave Wilcox has created a great manifold... but pricey. Nevertheless it interests me. An apples-to-apples test (dyno or track) would be good.

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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926}
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Old 12-29-2019, 03:03 PM
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Dave Wilcox did a very nice job porting my "Barry Grant 6-Shooter" (TRI-POWER) intake but the cost was not cheap, just like the single plane TRI-POWER intakes he is selling.

Tom V.

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  #11  
Old 12-30-2019, 12:04 AM
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Quote:
Originally Posted by Jack Gifford View Post
Thanks for the link- I had not seen that. I'm sure Dave Wilcox has created a great manifold... but pricey. Nevertheless it interests me. An apples-to-apples test (dyno or track) would be good.
Been following this for some time but it sure would be nice to "see" this manifold! No pics on the website yet unless I missed it?

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Old 01-07-2020, 10:05 PM
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Quote:
Originally Posted by brut4s View Post
I don't know if you saw this but if not here you go the only single plane Tri-Power I know of for a Pontiac
https://headsandmanifolds.wordpress....3000-7500-rpm/
Who has seen it? It doesn't exist without pictures! Let's see it.

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  #13  
Old 01-08-2020, 08:23 AM
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Quote:
Originally Posted by 433lemans View Post
Who has seen it? It doesn't exist without pictures! Let's see it.
I'd like to see it also

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  #14  
Old 11-03-2021, 09:05 PM
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Originally Posted by 433lemans View Post
Who has seen it? It doesn't exist without pictures! Let's see it.
Been plenty of time. Let's see it!

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  #15  
Old 11-04-2021, 05:45 PM
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Default Offy 360 tri power
Isn’t this a single plane intake?

https://www.ebay.com/itm/35354808243...BoCmCoQAvD_BwE

Here’s another.
http://hotrodcarbs.com/store/offenha...-manifold.html
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  #16  
Old 11-05-2021, 02:16 AM
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Yes, that appears to be the Offenhauser Equa-Flow that I mentioned in the original post of this thread. I'm still wondering if anyone here ever ran it?

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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926}
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  #17  
Old 12-22-2021, 06:29 PM
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Troy Patterson (tmp carbs) is making one.
https://www.facebook.com/14380661198...3501/?sfnsn=mo

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  #18  
Old 12-22-2021, 06:32 PM
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Here are pics for those thay don't have Facebook
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  #19  
Old 12-22-2021, 07:34 PM
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Does that intake look like a modded Offy 2-4 intake?Tom

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  #20  
Old 12-22-2021, 08:05 PM
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Looks like it to me too.

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