Is Bosch +4 a hot or a cold plug? I am using those in my car for about a 8 months now and I read somewhere that the cold plugs would be better.

Also changing to 0.045 inch gap be beneficial at all or not?

Thanks.

------------------
89Iroc, 305 TPI, WC T5, 3.08 Posi, Flowtech Headers 1 1/2, Hooker Y-Pipe 2 1/2, 3 inch over the axle, Flowmaster 80, No Cat, Aluminium Driveshaft, Ported Plenum, Air Foil, MAF Screens/Fins removed, K&N, Gutted Air Boxes, AFPR @45 psi, Ram Air, Throttle Body By-pass, Bumped Timing @12, Bosch +4, MSD 8mm wires, HP Rotor, Cap and Fuel Filter, Sensi Trac rear Shocks.

 

depends on the plug. they have different heat codes. running too cold of a plug will cause you problems with fouling. too hot can cause detonation. i dont think theres that much performance gain from a plug heat range, getting the right heat range just eliminates fouling/detonation.
you cant change the gap on bosch platinum +4 plugs. theres 4 electrodes.

------------------
85 IROC 350 11:1keith blacks,.555lift erson roller cam,1.5 crane roller rockers,edelbrock intake,holley 4150 750dbl pumper, nitrous oxide,full length heddman headers,true dual exhaust, 11"stall converter, 700R4, 3.73 locker