Ai 200cc CNC'd TFS 21° LT1
Cylinder Head
Our 200cc CNC'd 21 Degree TFS heads are one of our premier cylinder heads, with a professional racing level finish, and attention to detail. They're ideally suited for those looking for the high HP potential of our 200cc GM LT1 heads, but with a much nicer casting, and lightweight valves. Starting with a bare TFS "Porter" casting, they're built with professional racing quality full bronze guides, lightweight 8mm / 5/16" valves, and the highest quality spring setup available - PSI's with our custom lightweight tool-steel retainers. With supporting modifications this head is capable of producing approximately 500-550 SAE corrected horsepower with a daily driveable HR or SR camshaft, and appreciably more than that with more aggressive valvetrain packages and appropriate supporting modifications. Our standard PSI beehive & lightweight steel retainer easily controls aggressive HR and mild/moderate SR lobes. Higher load spring options are available for hydraulic and solid roller.
Machining & Labor:
Labor and Component Options:
Hollow stemmed, or Inconel valves for extreme power adder - Cost: +$POR
Upgrade to Ai Custom Lightweight Titanium Retainers (for PSI spring option) - Cost: +$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 $595-695 (depending on cam core/gear required)
Add an Edelbrock AirGap LT1 Intake Manifold + 58mm TB with or without porting.
Complete matching Heads / Camshaft / Valvetrain / Gaskets / Manifold / TB setup.
Recommended Usage: 350 cid - 396 cid short blocks, for a wide variety of applications from NA to power-adder. A very versatile head that can be altered slightly for your specific application at no additional charge.
Machining & Labor:
- 100% CNC Ported Intake & Exhaust runners
- 100% CNC Unshrouded & Contoured Chambers
- 100% CNC Professional Competition Quality Valvejob
- Bronze guides honed to ideal clearances per application
- Additional CNC'd Pushrod Clearance (required for 3/8" pushrods or 1.6+ rockers!)
- PCD milled to ensure flatness, surface finish, & achieve desired chamber volume (50 - 56 cc)
- Professionally assembled for your specific intended use, camshaft, & valve train setup
- TFS 21° LTx Porter Castings
- PSI MaxLife Springs (.650" Max net lift)
- Ai Lightweight Tool-Steel Retainers
- Manley Precision Machined & Hardened Steel Locks
- Ai Custom Machined & Hardened Chrome Moly Locators
- Lightweight 8mm Ferrea Stainless Valves - 2.020" Int & 1.570" Exh
- OEM Quality Steel Jacketed Viton Seals
- Optional @ Lower Cost: BTR .660" Capable Dual Spring Kit w/ Titanium Retainers
Labor and Component Options:
Hollow stemmed, or Inconel valves for extreme power adder - Cost: +$POR
Upgrade to Ai Custom Lightweight Titanium Retainers (for PSI spring option) - 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: 350 cid - 396 cid short blocks, for a wide variety of applications from NA to power-adder. A very versatile head that can be altered slightly for your specific application at no additional charge.
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