What type of coating is used on the exterior of the Gen II blocks. I noticed a section beginning to bubble near the thermostat housing. When I swapped over to the JM heads, I also noticed the coating was not on the factory cylinder heads. Is there a specific reason for this?
The Gen 2 block had a silver powder coating. Sorry to hear the coating has a bubble. There are some spot repairs that can be used for powder coating defects (or quite honestly a standard paint that matches in color will do the job).
You are correct, the factory Gen 2 heads were not coated. With the very high temps near the exhaust ports even powder paint would suffer (the heat rejection isn't as good either.
The Gen 2 block had a silver powder coating. Sorry to hear the coating has a bubble. There are some spot repairs that can be used for powder coating defects (or quite honestly a standard paint that matches in color will do the job).
You are correct, the factory Gen 2 heads were not coated. With the very high temps near the exhaust ports even powder paint would suffer (the heat rejection isn't as good either.