itsonlyairandfuel

Does anyone know the correct diameter WP pulley or part number? 1965 ,AC, PS. equipped. Thanks for you time. Ron B.

Bluestripe67

Is this a 327 or 396? Dennis

rongold

If it's got A/C, it has to be a 327. If it's a 300 HP engine, my 1983 parts book says it's a 3995643(no diameter or number of grooves given). If it's a 350 or 365 HP, its a 3995641 (double groove, 5 57/64 diameter). These numbers are probably not the same as the originals--They were the current replacements offered by GM in 1983.

RON

Mike Geary

the original 2 groove WP pulley is 3850680, which is 6.25" dia.

This is a scarce sucker, but a functional replacement is 3890419 which turns up fairly frequently. The only difference is the shape of the front contour. One has a pronounced waist (419).

The other pulleys for a 300hp A/C, PS car are:

crank - 3744043 6 5/8"

PS add-on crank pulley - 3751232

PS pump pulley - 3770509

If you go with these, PM me for the belt sizes that you need.

itsonlyairandfuel

Mike Geary, rongold Thanks for your posts with that information I will get something coming. You guys are correct it is a small block. Thanks again, Ron B.