Is it a Pro X from LA Sleeve or CT Racing, cause the ESR domes are different.
CT & LA Sleeve heads have a little divit on the inside to locate the dome & keep it from rotating when removing the spark plug, so a dome from ESR wont work unless the little divit slot is cut into it.
All the domes I have are either 310,330,350 or 370 stroker domes.
Neil
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