This is it, the final word in GM LT1 casting based performance.  This is the exact head that powers Rick Abare's 530 rwhp 3440-3470lb Trans-Am into the 9's at over 138 mph on pump fuel.  Moreover this is the only GM LT1 head that has been proven capable of consistently producing in excess of 500 rwhp SAE on pump fuel.  For the ultimate street or race oriented LT1 power plant, nothing else is even close.  Our finest GM LT1 cylinder head includes custom components made to our exacting specifications from our specified materials.  With the updated ports, lightweight custom stainless valves, and high end .650" lift capable PSI MaxLife beehive style springs, this is easily the best 500-600hp capable head available to the LT market.  While the PSI springs are significantly more expensive than most other spring options, the added insurance is well worth the price of admission.  Solid roller component options utlizing current professional competition quality components from PSI & Xceldyne also available on request.  Note:  Your heads must be casting number 10207643 or 10128374.

Now Available - Chamber volume up to 60cc


Machining & Labor:

• 100% CNC Ported Intake & Exhaust runners
• 100% CNC Unshrouded & Contoured Chambers
• 100% CNC Professional Competition Quality Valvejob
• Re-Machined Intake, Exhaust Flanges, & Valve Cover Rails
• Both Pressure and Hardness tested to ensure the casting's integrity & ability to seal
• PCD milled to ensure flatness, surface finish, & achieve desired chamber volume (52 - 56 cc)
• Professionally assembled for your specific intended use, camshaft, & valve train setup

Valves & Guides:

• Ai Custom Machined Lightweight Stainless Pro-Flo Valves 2.00" Int & 1.56" Exh
• Includes Valve Guides machined for K-Line Bronze Guide Liners + Honing to finish size
• OEM Quality Steel Jacketed Viton Seals

Two Component Options:

• BTR LTx Dual Spring Kit with Titanium Retainers for up to .700"
  
  OR
  
  
• PSI 1516 MaxLife .650" Lift Springs
• Ai Custom Machined Chrome Moly Locators
• Ai Custom Machined Lightweight Steel Retainers for PSI Beehives
• Manley Machined Steel Valve Locks

Cost: $2795 for labor, CNC work, and components listed above applied to your GM LT castings

Labor and Component Options:
Upgrade to Ai Custom Lightweight Titanium Retainers - Cost: +$POR
PSI .700"+ solid roller dual springs w/ Xceldyne Ti-17 Retainers & locks - Cost: +$POR

Add an Ai Billet Core Custom grind camshaft + In-House QC for $595-695 (depending on cam core/gear required)
Add an Edelbrock AirGap LT1 Intake Manifold + 58mm TB with or without porting.
Complete matching Heads / Camshaft / Valvetrain / Gaskets / Manifold / TB setup.


Recommended Usage: Stock 350 cid - 383 cid short blocks with piston relief/dish volumes of 5-16 cc.  With supporting modifications, manual stock short block F and Y bodies will typically produce 395 - 435 rwhp SAE corrected or 415 - 455 rwhp STD corrected depending on cam and valve train selection.  Purpose built 355-396's typically manage anywhere from 440 - 500rwhp SAE when utilizing our manifold work & valve train.  *Please note this head work requires your castings! Click here for packing and shipping information of your castings.*