Description PN: TEA-GML921-CUSTOM GM L-92, L-76, or LS-3 engines Bolt on 25-30 horsepower to your L-92, L-76, or LS-3 engine! We take the already good factory heads and incorporate our CNC port program and custom 5 angle valve job to make a very good factory head perform great. We also include our dual .650″ lift spring with titanium retainers for outstanding reliability and performance with most any cams. Basic Package includes- Full CNC ported intake and exhaust ports Custom 5 angle valve job Hand finishing of Valve job into Porting Flow test with included sheet Standard 68cc Chamber Blueprint ground intake and exhaust valves with necessary backcuts Deck surface finished with CBN cutter for ultimate surface finish Blueprint assembly in which all spring heights and pressures are checked Optional machining, springs, or aftermarket valve packages available. FLOW DATA 4.030″ BORE Lift Intake Exhaust 0.100 67 53 0.200 150 118 0.300 226 173 0.400 287 219 0.500 332 247 0.550 347 255 0.600 353 264 0.700 368 266 * Tests conducted at 28″ of water, radius plate int. 1.875″ x 4.0″ exh. pipe
