AFR 190cc LT1 Street Cylinder Head

The Small Port, High Velocity Torque Monster

The AFR Emissions Legal (CARB EO #D-250-2), 190cc intake port LT1 small block Chevy cylinder heads are available in the LT1 angle plug version only. These heads feature a 56cc to 74cc combustion chamber with a 64cc exhaust port and a 3/4" thick head deck (ideal for nitrous or blower applications.) The 53cc chambers are designed for flat top or dished pistons; domed pistons will require additional machining.Standard valves are 2.020 intake and 1.600 exhaust with AFR's hardened ductile iron interlocking valve seats. The exceptional flow characteristics, ideal operating range of idle to 6000 rpm (higher rpm ranges possible depending on combination of parts), 23º valve angle, and standard valve spacing make this the perfect street head for 350 cid to 383 cid engines. No special parts are required.

190cc SBC LT1 Street Head Part Numbers
CNC Ported Pairs of Cylinder Heads Complete With Parts and Ready to Install
Prices start at $1750.00

Stage 1 Bare Heads (no parts or porting) are available
All three LT1 cylinder heads listed here are emissions legal

Basic Package Components

• 100% CNC Ported Combustion Chambers
• 100% CNC Ported Exhaust Ports
• 70% to 100% CNC Ported Intake Ports
• 3-angle Valve Job
• Intake Valve, 2.020" standard length, AFR #7204
• Exhaust Valve, 1.600" standard length, AFR #7220
• 1.450" OD Hydraulic Valve Spring, 120 lbs. on seat, ..550" maximum lift, AFR #8020
• 10º Titanium Retainers, AFR #8506
• 10º Valve Locks, AFR #9005
• 3/8" Rocker Studs, AFR #6410
• Guide Plates, AFR #6105 if using non-self aligning rockers
• Valve Seals, AFR #6611
• Hardened Shims, AFR #6326
• Intake Valve Seats, AFR #9060
• Exhaust Valve Seats, AFR #9070
• Bronze Valve Guides, AFR #9050

Special orders available upon request
All Accessory Holes are Predrilled & Tapped!

Specifications, Features, and Supporting Components

• Head Torque: 65-70 Ft. Lbs.
• Rocker Stud Torque: 55-60 Ft. Lbs.
• Intake Port Gasket: 1.250"x2.040" Fel Pro #1284, AFR #6827
• Exhaust Port Gasket: Fel Pro #1404, AFR #6834
• Head Gasket: 350 cid Fel Pro #1074, AFR #6803
• Head Bolts & Studs: Standard ARP, AFR #6310 & #6305
• Head Bolt Washers: Manley, AFR #6320
• Stud Girdle: AFR #6201
• Suggested Manifold: GM LT1
• Spark Plug Starting Range: AC FR3LS
• Combustion Chambers: 56cc to 74cc
• Spring Pocket can be cut to 1.625, no deeper
• Valve Spacing Standard
• Rocker Arms Standard
• Valve Angle: 23º
• Angle Mill (milling available) .008" per cc
• Flat Mill (milling available) .006" per cc
• Pushrods: 5/16" Hardened AFR #6606

Please call if you have questions

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