Big block / small block Rocker question

K.O. SWINGER · Nov 13, 2021

So okay pretty simple question but all I've only really worked on is small blocks what is the difference between a big block rocker arm and a small block rocker arm if they're both 1.5 I realize that the spacing will be different due to the larger head of a B or RB but it's a rocker actually different? It must be there sold under different categories but what's the difference. Thank you.

brian6pac · Nov 13, 2021

BB have offset push rods, SB are centered. Not sure what it is, never measured them.

K.O. SWINGER · Nov 13, 2021

brian6pac said:
BB have offset push rods, SB are centered. Not sure what it is, never measured them.

Interesting, thank you. Are the shaft diameters the same?

brian6pac · Nov 13, 2021

K.O. SWINGER said:
Interesting, thank you. Are the shaft diameters the same?

Yes 7/8"

pishta · Nov 13, 2021

This came up on the dieseling sound thread. I wonder what the difference is between the stamped rockers? Slight offset can be beneficial even on an LA
340 compared to 383