Inliners International Forums General Discussion Engines Specs needed for a Chevy I6 (cast # GM 3877178)

I'll check to see if it's an HEI today. It doesn't have an integral head. I can't find the serial number for the van; I found the VIN (P1356Fxxxxxx) but any VIN decoder that I can find for chevy trucks that year don't work as the number I found is one digit too long. There is black painted over label on the wall toward the ceiling labeled "T92766" but other than that I can't find any other number except more codes casted onto the engine. Where can I look for some sort of date code? Thanks again!