The next number or two is the day, but sometimes. The letter is the month of manufacture- AJan. Pontiac used the same codes on different year blocks.To differentiate them it will have to be determined what year the block is.Next to the distributor hole there is a casting number that has a letter with 2 or 3 numbers.

Thank you for* These need to be researched more and are not guaranteed to be accurate.Paint charts are listed at autocolorlibrary.com. 1970 Engine Codes Code: Application: Displacement: Compression: Horsepower.More information to be added as it becomes available. You may notice the slightest dip in fuel economy as well.A new option was Pontiacs 455 engine, available now that GM had rescinded. P0455 code will typically not be accompanied by any noticeable symptoms other than the smell of gas and the service engine soon light. This iconic 1969 Trans Am, the first year for that potent.Pontiac G6 P0455 OBDII Code Symptoms The service engine soon light is often the only sign that the P0455 code has been triggered.

If anyone has any information on an alternate 1975 Pontiac engine color, please contact me.Used for all mid-73 thru 74 Pontiac engines including the 73-74 SD-455. This has been confirmed by owners of original GM paint.It has been speculated that Pontiac L78 and W72 engines were painted a different blue, but checking these engines against genuine GM engine paintSamples indicates GM corporate blue is correct.PPG/ Ditzler Blue Poly 14817* for Pontiac engine paint.PPG/ Ditzler Blue Poly 2083* for Oldsmobile engine paint.*Not known why the two above are listed as different paints.Bill Hirsch Auto Oldsmobile Metallic Blue 1966-On 455 CI' is reported to be a good match.Ames 1975-1977 Pontiac Blue Metallic engine paint FN410P, or N182TF, or PN431TFAt least one original looking February 1975 example has been found where the engine paint is a lighter non-metallic blue. Users report this color does not match.Note that aftermarket GM blue usually varies from original GM blue. Users report this is a good match to GM's original color.Plasti-Kote GM Corporate Blue 221. Be awareThe colors shown are for reference only and there is no way to accurately display these colors on different computer monitors.Aluminum engines are generally unpainted.Classic Industries GM Corporate Blue 62030Duplicolor General Motors Blue DE 1608.

PPG formula is at Classic Industries Slate Blue 62220 is supposed to be very close.Ames 1973-1974 Pontiac Blue engine paint FN401N, or N182TC, or PN431TCVendors that provide an incorrect color for 73-74 are not listed.Per factory service bulletin number 73-T-21A: 'Engines built after Mastarting withEngine number 532727 had a revised emissions system (two thermal valves near the front of the intake manifold and no EGR solenoid) and were painted thisColor. Any paint shop can custom mix it. Any SD-455 engines built before March 15th would have been repainted in this darker blue (see below).Color has been matched from low mileage engine parts, and is available from a few suppliers in spray cans. SD-455 engines were not released to production until April 1973.

Pontiac 455 Engine Code