[68Cpe307]

for stock 68 307 with HEI. should it be the stock plug with a wider .45 or .60 gap (cant recall exactly)...or should it be like a 1975 HEI spark plug for a 350ci for example ??
...should have asked years ago....currently running accel shorty plugs with .45 or .60 gap (cant recall exactly) and no probs, however curious to know....thx

 

[68Cpe307]

excellent, thanks, that is what i originally went with to be onsafe side -with the .45 gap - prior to replacing them with shorty plugs for more header clearance.....