The Aeroflow Performance Billet GM LS rocker arm mounting stands mount between the shaft and cylinder head for the correct rocker arm mounting position
JIS K2233 (Japan)
Aluminised Silver Heat Sleeve - 1-1/8" to 1-1/2"I
Filter Material: High Flow Premium Media
Proflow Cylinder Heads, AirMax 170, SB For Ford 289, 302, 351W, Aluminium, Asse Air Cleaners The Aeroflow Performance Billet GMPart Number : Proflow Cylinder Heads, AirMax 170, SB Ford 289, 302, 351W Proflow does not sacrifice quality for a low price you get both with our aluminium cylinder heads. The lightweight heads are cast from A 356 aluminium alloy with a large choice of engines, for SB & BB Chevrolet, LS Chev Holden Ford SB 289 351W, 302, 351 Cleveland 2V & 3V & BB FE, and Chrysler SB & BB. They have phosphorous bronze valve guides, and ductile iron valve seats for use