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Pontiac of the Month

gscherer78ta's 1978 Trans Am

2019 February
of the Month

  • Welcome to Forever Pontiac

    We are a community of Pontiac enthusiasts. The purpose of our community is to keep alive the Pontiac spirit by sharing (or showing off) our cars, discussing Pontiac, helping each other work on our cars and find information, plus attend various meets/shows/etc... To aid discussion, sharing, event planning and selling of parts/cars/anything, we have various parts of the website to aid this from Forums to an online Garage to Classifieds to even a Document Download Repository. You can find links to these in our navigation above based on what each section helps with (discussion, local events, learning, etc...).

    We invite you to contribute, find help or just view some of our member's amazing cars! Don't forget, we also have great contests from time to time (like our Pontiac of the Month and yearly calendar contest) and our Pontiac This OR That, a fun game where you choose the best of two randomly selected Pontiacs from our online garage.

    We look forward to seeing you around!

360Rocket

Old School Mickey Thompson Pontiac.

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From mac's Motor City garage.
M/T project from circa 1962 featuring a twin-supercharged Pontiac V8 with an unusual breathing arrangement, to say the least: The intake and exhaust ports are on the same side of the cylinder heads. But there was actually some method to the madness, as we will see.
A pair of GMC blowers mounted outboard and driven by Gilmer belts. This seems to be somewhere in the mockup phase, and the cylinder heads definitely appear to be new aluminum castings rather than modified Pontiac production pieces. Note: There’s an extra cylinder head on the floor at lower left in the photo that can give us a clue as to what this engine is all about.
This detail enlargement provides*a better look at the M/T cylinder head arrangement. We can see that yes, the intake passages have been rotated 180 degrees so now they are on the same side of the head as the exhaust ports.
While it seems counter intuitive to jam the intake and exhaust ports together on the same side of the head in this manner, evidently there was some sensible logic behind it. By flipping the intake ports around to the “back side” of the head, now they no longer had to snake around the pushrods and the top, inside row of long head bolts. The intake ports could now be shorter and straighter with minimum resistance to airflow. In theory, anyway.
There was also a naturally aspirated version of M/T’s contrary V8 using a pair of Carter AFB four-barrel carburetors. Since the conventional V8’s cylinder firing sequence would create some carbuertion problems with this arrangement, it’s possible that a 180-degree crankshaft, aka flat crank, was used. This would transform the Pontiac V8 into two separate-but-equal inline four-cylinder engines on a common crankshaft.
click on the links below;

MT-Twin-Blown-Pontiac.jpg?w=576&ssl=1
 

MT-cylinder-head-detail.jpg?w=399&ssl=1
 

MT-V8-NA-version.jpg?w=570&ssl=1

Hey Ringo? Would you consider opening a "Pontiac History" section so we can archive some Pontiac history, trivia, old school tech articles, pictures, etc. for future Pontiac enthusiasts? Just a thought. Some of the old timers here (not me of course, like Steve and Dennis, lol) may be able to contribute things like posted above as I believe we would have a good size audience of Poncho historians out there.

Edited by 360Rocket
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10 hours ago, 360Rocket said:

From mac's Motor City garage.
M/T project from circa 1962 featuring a twin-supercharged Pontiac V8 with an unusual breathing arrangement, to say the least: The intake and exhaust ports are on the same side of the cylinder heads. But there was actually some method to the madness, as we will see.
A pair of GMC blowers mounted outboard and driven by Gilmer belts. This seems to be somewhere in the mockup phase, and the cylinder heads definitely appear to be new aluminum castings rather than modified Pontiac production pieces. Note: There’s an extra cylinder head on the floor at lower left in the photo that can give us a clue as to what this engine is all about.
This detail enlargement provides*a better look at the M/T cylinder head arrangement. We can see that yes, the intake passages have been rotated 180 degrees so now they are on the same side of the head as the exhaust ports.
While it seems counter intuitive to jam the intake and exhaust ports together on the same side of the head in this manner, evidently there was some sensible logic behind it. By flipping the intake ports around to the “back side” of the head, now they no longer had to snake around the pushrods and the top, inside row of long head bolts. The intake ports could now be shorter and straighter with minimum resistance to airflow. In theory, anyway.
There was also a naturally aspirated version of M/T’s contrary V8 using a pair of Carter AFB four-barrel carburetors. Since the conventional V8’s cylinder firing sequence would create some carbuertion problems with this arrangement, it’s possible that a 180-degree crankshaft, aka flat crank, was used. This would transform the Pontiac V8 into two separate-but-equal inline four-cylinder engines on a common crankshaft.
click on the links below;

MT-Twin-Blown-Pontiac.jpg?w=576&ssl=1
 

MT-cylinder-head-detail.jpg?w=399&ssl=1
 

MT-V8-NA-version.jpg?w=570&ssl=1

Hey Ringo? Would you consider opening a "Pontiac History" section so we can archive some Pontiac history, trivia, old school tech articles, pictures, etc. for future Pontiac enthusiasts? Just a thought. Some of the old timers here (not me of course, like Steve and Dennis, lol) may be able to contribute things like posted above as I believe we would have a good size audience of Poncho historians out there.

Like the idea....before I forget.  360 who???

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12 hours ago, 360Rocket said:

Hey Ringo? Would you consider opening a "Pontiac History" section so we can archive some Pontiac history, trivia, old school tech articles, pictures, etc. for future Pontiac enthusiasts? Just a thought. Some of the old timers here (not me of course, like Steve and Dennis, lol) may be able to contribute things like posted above as I believe we would have a good size audience of Poncho historians out there.

We have the "Pontiac Forgotten and Future Classics" that we could morph into this overall idea.

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