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Old 02-01-2018, 07:28 AM
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Tom Vaught Tom Vaught is offline
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Join Date: Dec 2001
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Ah! I knew I had seen more than one picture of the 421 'Pyramid' Block and the 421 Pistons in the block in the GTO.

This was the driver's (opposite) side of the engine when the 421 engine was installed. Again the Pyramid is visible though not as clear.

You can also identify the Blue Car's Michigan Plate HJ-4471, and as you said, the lack of any outside rear view mirror.

The Earlier Blue Car also had the old style 389 SD Mechanical Linkage installed on the carbs.
They, at least, have the SD Tri-Power (Tube and Plunger) installed correctly in the picture. Plunger end attached to the Triangular Plate on the center carb.

Tom V.

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Last edited by Tom Vaught; 02-01-2018 at 07:45 AM.