New motor gone...

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I was told by a couple people I should try a colder plug than a 7. 9 seems high to me though. Anyone else run this heat range?
 
Well fix the mechanical issue 1st. Like spring pressure and check the valve to guide clearance. Give NGK a call for the plugs as they were bang on for my race motor. Keep us posted as Im interested in your results.
 
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Already have the heads rebuilt. Chamber is completely fixed and within 1/2 cc of other chambers, have Engine Pro Racing black nitride valves and 155# springs. I ended up going with NGK 8s. Should be back on the road soon.
 
Mallory 685 box banged the hell out of my blower when it smoked! I have it mounted inside the car and I couldn't even touch it it was so hot! GRRRRRR. No damage luckily because I was at cruise RPM. I bypassed it and got home.
 
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