| Air Flow Reasearch AFR-0909NP SBC 180cc LT1 Reverse Cool Competition Package Heads, (Specify chamber size 55cc - 65cc) L98 angle plug, No Parts 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), 23° valve angle, and standard valve spacing make this the perfect street cylinder head for 350 cid to 383 cid performance engines and is specifically designed for 1992-95 Corvettes and 1993-97 Camaros. No special parts are required. Dual valve cover bolt pattern is standard. Exhaust port is raised .100 over GM L98 cylinder heads.
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 #8605, 1.290 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. SBC Cylinder Head Footnotes 1. General special parts/requirments * As with all aftermarket heads, a different lenght pushrod might be required. * As with all aftermarket heads, your factory self aligning rockers might no longer provide the reliability required. * Due to many available factory OEM style/variations your existing stud girdle may not fit. * See below what factory OEM head AFR used for CAD/CAM modeling. * Please see footnotes and the specific product page your researching for specific variences from OEM heads. 2. SBC Cylinder Heads * Was modeled after the GM L-98 LT1/LT4 aluminum cylinder heads. |
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