it was to lean before now you are fatter on the fuel mix which will help cool it some,IIRC
it gets way hotter running lean from comb chamber to the exhast ports and into the header tube...thats why they glow red when lean
setting one with the vac gauge is the best way to see what an engine is doing,rather than listening to it by ear,or light,trusting the marks are correct
dont know how many I have straightend out cause they said they can set it by ear...shadetree falls right on them when the vac gauges does it magic...
just showed some one there burnt up piston cause they could set it be ear...told them it was advanced to much and was not the 93 gas!!!!
said it was built with lots of comp and it pings on the street
they had it so advanced it was bucking like it had a cam
shade tree fell right on them when I showed #4 pist with 1/3 of it gone down to the 2nd ringland
next to a comp check and leakdown test as the best trouble shooters, IMO