Pontiac tagged posts

Under Construction

April 30, 2010 Uncategorized

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Pontiac Crankshaft part numbers

April 30, 2010 CrankEngine

Pontiac Crankshaft Part Numbers

Technical Notes

Pre-1964 cranks must be machined to fit Turbo Hydromantic torque converters.Numbers on the crank are often the same as the part number, but not always.Replacement cranks may be a different part number or casting number than what came in the original engine.Bearings must be installed in the engine and measured prior to grinding the crank to get clearances right.Pilot bearing is # 7109 (GM part number 15533265)Size is 1.3780"OD x 0.5906"ID x  0.3543"W (35 mm OD x 15 mm ID x 9 mm W)Starting around 1966-1967, not all cranks used with automatic transmissions were machined for a pilot

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Pontiac Camshaft Cross Reference

April 30, 2010 CamshaftEngine



The following information is provided as a guide only. Every attempt has been made to accurately represent the manufacturer's specifications. Before choosing a camshaft confirm specifications with the manufacturer.

The camshaft manufacturers are sorted alphabetically and are listed in terms of duration.

Manufacturer's Name

Part Number

Advertised Duration

Duration @ .050

Lift With 1.5 Rocker Arms

Lift With 1.65 Rocker Arms

Lobe Separation Angle

Intake Centerline

Pontiac OEM








Pontiac OEM









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Piston ring installation

April 30, 2010 EnginePistons

Pontiac piston ring installation

The following steps are based on Manley and SpeedPro pistons and rings as used by the writer, and based on the respective installation instructions of the piston and ring manufacturer. While the installation procedure and positions are common across most piston and rings makes and usage type, the end gaps may vary. In this case always refer to the instructions supplied with the piston rings you purchase.

1. File fit rings sets require filing of the top and 2nd rings to achieve the correct end gap. To properly measure the ring gap, the ring should be square in the bore 1” down from the deck. Measure the ring end gap with a feeler gauge or equivalent device. Calculate the recommended

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Degreeing a Camshaft

January 17, 2010 CamshaftEngine



For my 400 engine rebuildI chose the Competition Cams 270H camshaft. It has a lift of .470" on the intake and exhaust. With Magnum Roller Rockers it is .006" higher. The cam is designed to be positioned straight up, that is, dot to dot, on the timing sprockets. If it measures correctly, straight up will match the recommended 106 degree intake centerline of the manufacturer. (By the way, it did.)


There are several ways to degree a cam. This is my version. As indicated above, my engine is a 400. The following method worked exceptionally well for me and applies to when you have the heads off the block .

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Cylinder head casting number usage

January 2, 2010 Engine



1964 326/250 hp 326/280 hp 389/215, 230, 235 hp 389/267, 283, 303, 306 hp 389/325, 330, 348 hp 421/320 hp 421/350, 370 hp

1965 326/250 hp 326/285 hp 389/256 hp 389/290, 325, 333 hp 389/335, 338, 360 hp 421/338 hp 421/356, 376 hp NOTE: All casting #s are on end port.

1966 230/165 hp 230/207 hp 326/250 hp 326/285 hp 389/256 hp 389/290, 325, 333 hp 389/335, 360 (GTO) hp 421/338, 350 hp 421/356, 376 hp

1967 230/165 hp 230/215 hp 326/250 hp 326/285 hp 400/255, 260, 265 hp 400/290 hp 400/325, 333 hp 400/350 hp (Grand Prix) 400/325, 335, 360 hp 400/325, 360 hp, Ram Air 428/360, 376 hp

1968 250/175 hp

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Firebird – VIN Decoding

January 2, 2010 VIN Decoding

The Pontiac Firebird was introduced to the market in 1967. It happens to be the only year where the VIN plate was a stainless steel plate riveted to the door jamb. All subsequent years till the Firebird was pulled off the Pontiac production line had their VIN plate located on the dash panel in front of the driver and in full view through the windshield.


The articles references below contain a detailed explanation of how to understand the VIN plate information. This information can be extremely useful when buying a project vehicle or when restoring a Firebird as they may help you understand the vehicle you are dealing with.

Pontiac Firebird 1967-71 VIN decoder

Pontiac Firebird 1972-80 VIN decoder


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Block Identification

October 23, 2009 Engine



Pontiac blocks are easy to identify if you know what to look for. It is simple, for example, to visually categorize all 1959-and-later blocks into 389/400 or non-389/400. All displacements other than 389/400 possess a "transfer lug" (found at the rear of the block shaped like a "mountian" or "pyramid"). There are only two exceptions: the 1961-62 421 SD (the same blank casting as the 389) and the 1973 SD-455. All V8 blocks cast prior to 1959 (287, 316, 347, and 370) were "standard" displacement and did not have a transfer lug. In addition, these 1955-58 blocks did not use side-mounted motor mounts as did all blocks from 1959 forward. All blocks through model year 1963 have a production number cast into the passenger side of the block. The

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Firebird – Wiring Diagram

October 23, 2009 Electrical

Download PDF file of 1969 Firebird wiring diagram - front end

Download PDF file of 1969 Firebird wiring diagram - rear end


If you have any Pontiac wiring diagrams which do not appear on this site please email them to info@pontiaction.com and we shall publish them

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October 9, 2009 Uncategorized

Looking for Pontiac info you can trust? Look no further! Bookmark this page !!

A restoration project is no easy task. Restoring a classic Pontiac can be fun yet still not easy !! The sources of information are many and spread across the web. Google helps us bring them closer but alas not together. The Pontiaction project is the brain child that intends to bring all (or a good part of it) together in this website and eventual blog and forum.

Through our research and that our readers we intend to put together all things Pontiac in this site. All input and feedback is welcome. The more information and data sources we can provide will help our Pontiacs last longer to be enjoyed for many generations to come.


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