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66 Tri-Power

Posted by C. R. 
Pontiac GTO Masthead

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66 Tri-Power
October 05, 2005 02:34PM
Lookin for a 66 tri-power.......anyone know of any? Preferably on the east coast.

Email: Fitchfan1@aol.com
Re: 66 Tri-Power
October 09, 2005 01:56AM
I HAVE A FEW 66 TRI POWERS FOR SALE.
ONE BOLT ON READY ONE NEEDS A REBUILD.
CALL ANY TIME..
845 656-2510
IN NY 12569
PHIL
Re: 66 Tri-Power
November 25, 2006 03:30PM
phil do you have any orginal valve covers for a 389 tri power
Re: 66 Tri-Power
June 21, 2007 05:41PM
I'm not on the east coast, but have a 66 tri carb setup, carbs have been rebuilt, includes breathers and new filter elements; manifold has been blasted and painted, linkage all there and functional. I have pix if you want to see. email is the best way to contact me, but can call me at 580/775-3425.

Tim
Re: 66 Tri-Power
January 24, 2009 04:50AM
I have a 66 389 original tri power. Was running when I took it off the car but it has been setting up for several years. Will need kits.

I also have the chrome valve covers for that engine.

Ray Overstreet
Austin, Texas
Re: 66 Tri-Power
March 16, 2009 11:11PM
Has anyone installed a 66 Tri-Power on a 72 455 and if so what type of intake gaskets did you use? or can this even be done? The problem that I am finding is that the heat riser port on the intake passenger side doesn't match the heat riser port of the head.

Johnny
Re: 66 Tri-Power
March 17, 2009 01:22PM
Quote
getreeltoo
Has anyone installed a 66 Tri-Power on a 72 455 and if so what type of intake gaskets did you use? or can this even be done? The problem that I am finding is that the heat riser port on the intake passenger side doesn't match the heat riser port of the head.

Johnny

You're going to need a tri-power intake manifold that will bolt onto a 455 block... don't know if those exist, but if they do they're going to be specialty orders.
Re: 66 Tri-Power
August 25, 2009 05:41PM
You can put a tripower unit from 1966 on a 455 without any major troubles. I've seen it done several times and look at my handle it says it all.

Honestly, if you do a search on the internet you will find serveral articals that refer to exactly what you want to do. If I have a bit more time later I will post links.

Note: my block is a 1973 Block out of a Grand AM my intake is from 1966.
Re: 66 Tri-Power
August 25, 2009 05:55PM
Here is a little more that I found for you. This will probably answer your question.


First, a 455 has the same deck heigth as the 326, 350, 389, 400, 421, and 428. That said, the head is the critical factor. Heads from 61 to 64 have different water passages, a different bolt pattern, and a different angle where they meet the intake than do the 65 and later heads.

Therefore, what most people want is the popular 65 or 66 tripower to fit the improved and readily available 65 up heads. A 65 or 66 tripower will bolt directly to the 65 to 71 Pontiac heads. However, starting in 72, Pontiac has an extra exhaust crossover port in one of the heads. The 6X head is a mid-70s head and has this extra port. The 65/66 intake will not cover this port. There is no special intake gasket to accomplish this. The force of the exhaust is too intense for a gasket to stop. Best method is to have a machine shop fill this extra port while you are having the head work done. At least one customer filed this port while the head was on the car, using JB Weldand reports no problems. I am much more comfortable with the first method.


Many thanks to www.pontiactripower.com for the information above.
Re: 66 Tri-Power
May 14, 2010 03:17AM
i can help u look for one

Car Detailing Charlotte
704-464-0163
[www.cardetailingcharlotte.com]
Charlotte, NC 28246



Edited 2 time(s). Last edit at 05/14/2010 03:53AM by Charlotte.
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