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Pontiac Engine Specifications
Written by Frank Gore   
Thursday, 27 October 2005 16:16

Here's a list of specifications for the Pontiac engine from the mid 1950's to 1979. The engine block design was largely unchanged throughout the years. This list was compiled using many sources, both printed and online.

More information will be added over time, including head casting specifications. If any of this information needs correcting, please let us know.

Firing Order

The firing order on all Pontiac engines is as follows:
1-8-4-3-6-5-7-2

Cylinder Numbers

The cylinders on all Pontiac engines are numbered as follows, front to back;
Driver-side: 1-3-5-7 Passenger-side: 2-4-6-8

Deck Height

The piston-to-deck height on all Pontiac engines was always 0.023".

Connecting Rod Dimensions

Rod Length: 6.625"
Big End: 2.250"
Small End: 0.980"

Bore and Stroke

Displacement Bore Size Stroke Length Main Bearing Diameter
287 3.75 3.25 2.50
316 3.94 3.25 2.50
326 3.72 3.75 3.00
347 3.94 3.56 2.623
350 3.875 3.75 3.00
370 4.06 3.56 2.623
389 4.06 3.75 3.00
400 4.12 3.75 3.00
421 4.094 4.00 3.25
428 4.12 4.00 3.25
455 4.15 4.21 3.25


Last Updated on Monday, 26 October 2009 20:21
 
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