v2.65GM/18º
2.65in² MIN
58cc chamber
250cc runner*
2.150 valve
1.60 exhaust
50º seats
4.155 fixture 
.200 148/119
.300 219/170
.400 273/208
.500 314/236
.600 348/244
.700 364/255
.800 368/260
.900 370/263
1.00 372/265

This is the next step for those who want to move into a powerful cylinder head from a 23º.  This head features a GM 363 casting.  This casting has won many races over the years! 

$4250. Fully CNC'd, Manley Custom Severe Duty Valves, PAC 1356 Springs, Manley Titanium Retainers, Manley Bead Locks, Manley locators, viton seals, bagged and ready for install.

$5250. Fully CNC'd, Manley Titanium Valves, PAC 1356 Springs. Manley Titanium Retainers, Manley Bead Locks, Manley locators, viton seals, bagged and ready for install.

UPGRADES: Prices ADDED to Package

• Beryllium copper seats $400 
• Hand Finished $500
• Spring Options $CALL
• Spacer plates $185
• Jesel KPS-12265 Rocker Kit $1580
• ARP 234-4337 stud kit