AFR 180cc LT1 SBC Eliminator Street Cylinder Head
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The Small Port, High Velocity Torque
Monster
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|  The
AFR Emissions Legal (CARB EO #D-250-2 for engines up to 1994), 180cc
intake port LT1 Small Block Chevy cylinder heads are available in
the LT1 angle plug version only. These heads feature a 55cc to 65cc
combustion chamber with a 64cc exhaust port and a 3/4” thick
head deck (ideal for nitrous or blower applications). Standard valves
are lightweight 8mm 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 cylinder head for 350 cid to 383
cid engines and is specifically designed for 1992-95 Corvettes and
1993-97 Camaros. No special parts are required (see footnotes here). Dual valve cover bolt pattern is standard. Exhaust port is raised .100 over GM L98 cylinder heads.
Note:
Hydraulic roller cams typically experience valve float at 6000-6200
rpm because of their fast ramp rates. AFR suggest you upgrade your
springs to AFR part #8047, 1.530 O.D. with higher spring pressures
and use our Patented “Hydra Rev Kit” to reduce chances
of valve float associated with rpm 6200 or higher. |
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180cc SBC Street Aluminum Cylinder Head Flow Chart |
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180cc SBC Competition Package Cylinder Head Flow Chart
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180cc SBC LT1 Street Cylinder Head Part Numbers
CNC Ported Pairs of Heads Complete With Parts and
Ready to Install
CNC Street Ported Heads
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Description
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Part Number
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| 180cc LT1 Street Heads, Angle Plug, 55cc-65cc |
0908 |
Competition Package CNC Ported Heads
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Description
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Part Number
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| 180cc Street Heads, Angle Plug, 55cc-65cc |
0909 |
Stage 1 Bare Heads (no parts or porting) are available.
| Basic Package Components |
Part # |
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
3-angle Valve Job |
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| Intake Valve, 2.020" standard length |
AFR #7251 |
| Exhaust Valve, 1.600" standard length |
AFR #7250 |
| 1.290" OD Hydraulic dual valve spring w/ dampener |
AFR #8017 |
| 135lbs on seat, .600" maximum lift (upgrades available) |
Comp Pkg #8019 |
| 7° Titanium Retainers |
AFR #8515 |
| 7° Valve Locks |
AFR#9007 |
| 3/8" Rocker Studs (if using non-self aligning rockers) |
AFR #6410 |
| Guide Plates |
AFR#6110 |
| Valve Seals |
AFR #6612 |
| Hardened Shims |
AFR #8042 |
| Intake Valve Seats |
AFR #9060 |
| Exhaust Valve Seats |
AFR#9070 |
| Bronze Valve Guides |
AFR#9051 |
| Specifications, Features, and Optional Supporting Components |
| Head Torque |
65-70 ft. lbs |
| Rocker Stud Torque |
55-60 ft. lbs |
| Intake Port Gasket |
GM #12524653 LT1 or Fel-Pro #1284 |
| Exhaust Port Gasket |
Fel-Pro #1404, AFR #6834 |
| Head Gasket |
350cid Fel-Pro #1003, AFR #6800 |
| Head Bolts & Studs |
Standard ARP, AFR #6310 & #6305 |
| Head Bolt Washers |
Manley, AFR #6320 |
| Stud Girdle GM L98 |
AFR #6200 |
| Suggested Manifold |
GM LT1 |
| Spark Plug Starting Range |
AC FR3LS or 41629 |
| Combustion Chambers |
55cc to 65cc |
| Spring Pocket can be cut to 1.625, no deeper |
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| Valve Spacing |
Standard GM L98 |
| Rocker Arms |
Standard GM L98 |
| Valve Angle |
23° |
| Angle Mill (milling options available) |
.008" per cc |
| Flat Mill (milling options available) |
.006" per cc |
| Pushrods |
5/16" Hardened AFR #6606 |
Important: Do not port match you intake manifold to GM LT1 / Fel-Pro gasket as it does not precisely fit AFR heads.
Note: Milling head deck will affect flow numbers.
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