Advanced Induction - 260cc GM 823 Head Package

Ai 260cc CNC'd GM 823 L92 Cylinder Head Package

GM's #823 rectangular port casting has decent potential out of the box. Our 260cc Budget CNC option is a great choice for guys who would like to realize most of the potential gains available with the 823, but are not inclined to port the casting to its ultimate potential. This additional gain is attained via fully CNC porting the exhaust runners, and CNC machining the valve seat & bowl area of the intake port. The remainder of the intake port, and the combustion chamber are left as cast. Combined with our high end CNC valve jobs, precision valve grinding, and milling, the head is bumped into the 600hp+ potential range. Typical gains for this option are in the 20-35rwhp SAE range over the as cast 823.

Pricing is for work applied to a pair (2) of cylinder head castings and components YOU supply unless otherwise noted. We are happy to build your heads with whichever spring kit, valve, etc. you would like.

Machining & Labor Operations:

100% CNC Ported Exhaust Runners
100% CNC Professional Competition Quality Valvejob
Factory Valves Cleaned & Precision Ground
PCD milled to ensure flatness, surface finish, & achieve desired chamber volume (62 - 73cc)
Intake Flange, Exhaust Flange, and Valve Cover Rail PCD Milled to new surface finish specs

Machining & Labor Cost: $795

Labor and Component Options:

Bronze Guide Liners installed & honed to ideal clearances to refurbish worn out guides. - Cost: $125
Replace OEM guides with Full Bronze Guides & hone to ideal clearances - Cost: $250

PSI 1511 MaxLife Endurance Spring Kit w/ OEM Replacement Seals. - Cost: $250
Manley 23622 Titanium Retainers for OEM, PAC, PSI, etc. beehive springs - Cost: $195
Lunati Gold dual valve spring kit w/ lightweight steel retainers. Lift capacity to .660" - Cost: $225

Manley 221436 Nextek .660" shot peened & fully polished Dual Spring Kit:

$525

Please Contact Us for shipping & turnaround quotes!