I think thats a great idea Mus. Going by size alone, swapping that huge stock crank pulley out for an undersized unit seems like the greatest benefit of going to underdrive pulleys. I've told people that read nothing but the magazines and net that the Bullitt REALLY does not have "underdrive" pulleys. Only the water and alternator are "optimized". Probably makes little to no difference as far as freeing up power/tq.
HEY MEN, I HAVE BOUGHT AND INSTALLED THE STEEDA UNDERPULLEYS. MY PERFORMANCE MAN AT THE SHOP SAYS THE ONE S ON THE BULLET ARE OPTIMISED, AND MAKES NO DIFF. AS YOU KNOW THE PULLY ALONE SHOULD GIVE THE BULLITT THE HORSES OVER THE GT. I CAN TELL A FASTER ENGINE REV-I RECOMMEND.
The good thing about the Steeda crank pully is that the Steeda timing adjuster bolts right to it. The ideal situation is to do both at the same time. DEFINITE gains from adjusting the timing. But you have to use 92-93 octane. Every car is different but somewhere between 12 and 17 degrees is the usual scenario. Stock timing is 10. Even if you get a chip which bumps the timing you can still use the adjuster. I had mine at 16 before chip and 11 after. another plus is that if you get some bad gas and you need to retard the timing then you can do it right on the road. I always keep a 3/16 allen key in my glove box for that reason. just my 2 centz.
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