Notes: Street legal performer; chamber size 60cc; single; 2.02" intake valves; requires pushrods PN# 9632; street legal; requires head bolt bushings PN[9680] and OE bolts or head bolt kit PN[8552]; will not accept rail rockers; recommend Edelbrock gasket PN[7313] head; PN[7220] intake; PN[7227] exhaust; 50-state street emissions legal;

Notes: Performer; chamber size 60cc; single; 1.90" intake valves; street legal; requires head bolt bushings PN[9680] and OE bolts or head bolt kit PN[8552]; will not accept rail rockers; recommend Edelbrock gskt PN[7313] head; PN[1250] intake; PN[1415] exhaust;

Notes: Street legal performer; chamber size 60cc; single; 2.02" intake valves; requires pushrods PN# 9632; street legal; requires head bolt bushings PN[9680] and OE bolts or head bolt kit PN[8552]; will not accept rail rockers; recommend Edelbrock gskt PN[7313] head; PN[1250] intake; PN[1415] exhaust; 50-state street emissions legal;

Notes: Performer; chamber size 60cc; single; 2.02" intake valves; street legal; requires head bolt bushings PN[9680] and OE bolts or head bolt kit PN[8552]; will not accept rail rockers; recommend Edelbrock gskt PN[7313] head; PN[1250] intake; PN[1415] exhaust;

Notes: Performer centerbolt; chamber size 60cc; single; must use hardened pushrods; street legal; polished;

Notes: Performer high-compression 454-O; chamber size 100cc; single; street legal; Big block.

Notes: E-Tec 170. Chamber size 64cc; single; for engines with Vortec-style intake manifolds; 50-state street emissions legal; for use with eTec manifolds; Small block.

Notes: Street legal performer; chamber size 60cc; single; 2.02" intake valves; machined; requires pushrods PN# 9632; requires head bolt bushings PN[9680] and OE bolts or head bolt kit PN[8552]; will not accept rail rockers; recommend Edelbrock gasket PN[7313] head; PN[7220] intake; PN[7227] exhaust; 50-state street emissions legal;

Notes: Performer RPM; chamber size 87cc; single; street legal; recommend FelPro gasket; PN[1016] head; PN[1233] intake; PN[1436] exhaust; recommend Edelbrock gasket PN[7381] head; PN[7280] intake; PN[7281] exhaust;

Notes: Performer centerbolt; chamber size 60cc; single; must use hardened pushrods; street legal; when using stock rockers; must use .100 in. longer than stock pushrods; rec. FelPro gasket PN[1010] head; PN[GM10159409] intake; PN[1404] exhaust; 50-state street emissions legal;