3.0.1 Engine block
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3.0.1 Engine block
The engine block is finished in a medium gray gloss enamel.
Two colors of gray were used during GPW production. The earlier color is a cold slate-gray while the later color is lighter and warmer.The date of the color change is not known at this time.
Cast markings: GPW 6015 in raised letters on lower-right side of block, with a script “f” above.
Early engines had a casting date code located on the lower rear corner of the right side of the block. This code included a single letter representing the month (i.e. A = January) and the numeric representation of the day. An additional digit may have represented the mold pattern number.
Around August, 1943, engine casting dates were relocated on the block. These date codes were located below the distributor and started with a letter representing the month followed by the day and the last digit of the year. For example H3311 was cast on August 3, 1943. The final two digits may indicate the mold or line number.
The serial number pad, located behind the oil filter is stamped with the engine serial number. The engines were stamped with their serial number when the blocks were machined, and the chassis were stamped with the engine’s serial number at the time the engine was mated to the frame. As a result, occasionally GPWs would roll off the assembly lines with a serial number that would appear to belong to a much older vehicle.
Around 12/42, the block casting or machining process was changed, resulting in a change to the serial number pad. At this point, the pad was no longer machined uniformly smooth from front to rear, but incorporated a “step” at the very rear of the pad.
Engines numbered 232051 through 243405 use studs NOT bolts to retain the valve covers. Use of bolts in these blocks will crack the cylinder wall bosses. Also, all spare engines with casting dates of K-10-4 to L-29-4 were changed to studs.*
The engine serial number should match chassis and data plate numbers. Nonmatching serial numbers will result in a significant deduction of judging points.
* Per J.Gilmore archival research (!FoMoCo 12/44)
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