Advanced Induction - 205cc GM 241 Head Package

Ai 205cc CNC'd GM LS1 Cylinder Head Package

GM's #241 5.7L LS1 head casting is one of the most commonly available GM castings out there. While often swapped out in favor of 243's, the venerable 241 is still capable of producing great power for the $ considering how cheaply the castings can be obtained. Our 205cc CNC work is a good choice for guys who would like a bit more gain than our Performance Rebuild, but are not inclined to port the casting to its potential. This additional gain is attained via fully CNC porting the exhaust runners, and CNC machining the valve seat area of the intake port. The remainder of the intake port, and the combustion chamber are left as cast. Typical gains for our CNC work are in the 20-30rwhp SAE range over the as cast 241.

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 (60 - 72 cc)
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!