[BruceWilkie]

Originally Posted by Tom Vaught

Ford Tunnel Port Heads cracked in that area from being a SOLID cast iron head.

Aluminum heads might be a bit safer. If someone had a "partial head" I would be cutting around that spark plug to see how much water was there. Minimum water passage size around the spark plug, on an aluminum head designed today is 3mm (around .125" for people not used to the metric system).

I would find out that answer VERY QUICKLY

Tom Vaught

ps ASSuME that Edelbrock Engineers have the knowledge to follow that general rule.

I think I'd be concerned about insufficient tip cooling from the intake charge as well. Granted you dont need fuel pouring into the plug gap but a little more exposure to the cooler intake flow with the tip biased a tid to the exhaust to minimze fouling yet plug residing closer to the cooler charge seems a bit safer.