[DeTomaso] Spark Plugs

[JDeRyke at aol.com]

JIm, I don't have my heat range chart handy, but are these TF's aluminum 
heads? Getting the right heat range is one thing but having the correct reach 
to tighten up is also important. Most aluminum heads use 5/8" or 3/4" - 
reach plugs; quite different from stock 0.468"-reach plugs for iron-heads on 
351-Cs. My aluminum SVO heads take 5/8"-reach plugs that also fit an 
aluminum-headed smallblock Corvette. No problems with those AC plugs the last 19 
years. - I really ought to pull them sometime and check.... FWIW- J DeRyke