If that color change over point was not made by just full throttle runs and then shutting the motor down then you need one step colder plug, but even if it was the heat range looks like it’s on the edge of too hot to me.
One things for sure buying and testing another set of plugs is a heck of a lot cheaper then the cost of pounded out rod bearings!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
|