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GILBERT CHEVROLET - AFR 357CC FULLY CNC PORTED MAGNUM BBC CYLINDER HEAD | |
| AFR’s 357 “Magnum” flows over 415 CFM @ .700 valve lift! No other production style BB Chevy head even comes close. These heads will also provide impressive torque figures at higher rpm levels. Blown, turbo, and nitrous engines will especially like the larger, higher flowing intake ports. Call for prices and more information on these heads. | |||||||||||||
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WEB SITE NAVIGATION INFORMATION | |
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AFR NAVIGATION | |
| Index Page | 195cc SBC Street |
| 335cc BBC Rectangular CNC Ported | 305cc BBC As Cast Torquer |
| AFR Parts & Accessories | 205cc LS1 Mongoose Street |
| 180cc SBC Street | 357cc BBC Rectangular CNC Ported |
| AFR Hydra-Rev Kits | |
| Note: You must call us for prices. GILBERT CHEVROLET will not be posting prices for AFR heads on our web site. | |
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AFR 357CC RECTANGULAR FULLY CNC PORTED MAGNUM BBC HEAD DESCRIPTION | |
| AFR’s Magnum Series | |
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AFR’s BB Chevy Magnum Series would make even “Dirty Harry” drool with envy. If “Dirty Harry” drove a racecar, it would certainly be fitted with a pair of our 345 or 357 “Magnum” cylinder heads. If huge horsepower is what you are searching for, either of these castings will certainly deliver. With our Race Ready “As Cast” 345cc flirting with 400 CFM and our fully CNC ported 357cc flowing 425 CFM, these heads represent the ultimate in airflow for your BB Chevrolet. Our 357 “Magnum” flows over 415 CFM @ .700 valve lift! No other production style BB Chevy head even comes close. Both of these heads were targeted at larger cubic inch engines (509-632 CID) looking for maximum horsepower and rpm capability with a primary operating range of 3500-8000 rpm’s (This range is an average and will vary with engine displacement and component selection). These heads will also provide impressive torque figures at higher rpm levels. Blown, turbo, and nitrous engines will especially like the larger, higher flowing intake ports. Both of these heads will work best with camshafts exceeding .750 gross valve lift to make better use of the substantial airflow found in the higher lift range. Both the 345cc and the 357cc come standard with AFR’s trademark .750” thick head deck, reinforced rocker stud bosses, and are equipped with premium one piece stainless steel 2.300” intake valves and 1.880” exhaust valves. Standard combustion chamber volume is 119cc’s on the 345 “As Cast” pieces, while our fully CNC ported 357 version comes with a 121cc chamber. Both are available with an optional 114cc combustion chamber as well. Properly selecting the correct cylinder head depends on a large number of variables. Please consult with one of our sales technicians to assist you in making the best decision for your particular application. Note: Optional stud girdle required for 2° rolled valve angles and 1” longer head bolts needed on four bottom exhaust bolt holes. |
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BASIC PACKAGE COMPONENTS | |
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• Competition 5-angle Valve Job • Intake Valve, 2.300” stainless steel, AFR #7626 • Exhaust Valve, 1.880” stainless steel, AFR #7631 • 1.550” OD Roller Dual Valve Spring with dampener, 240 lbs. on seat, .750” maximum lift, AFR #8003 • 10° Chrome Moly Retainers, AFR #8511 • 10° Chrome Moly Valve Locks, AFR #9005 • Valve Seals, AFR #6611 |
• Hardened Shims, AFR #8044 • Intake Valve Seats, AFR #9062 • Exhaust Valve Seats, AFR #9064 • Bronze Valve Guides Intake, AFR #9045 • Bronze Valve Guides Exhaust, AFR #9046 • Guide Plates, AFR #6109 • 7/16" Exhaust Rocker Stud AFR #6406 • 7/16" Intake Rocker Stud AFR #6407 |
| Note: All Accessory Holes are Predrilled & Tapped! | |
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SPECIFICATION, FEATURES, AND SUPPORTING COMPONENTS | |
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• Head Torque 75 Ft. Lbs. • Intake Port Gasket, 1.775” x 2.500” with 1/2” radius AFR #6856 • Exhaust Port Gasket AFR #6858 • Head Gasket 4.370 bore, Fel Pro #1027, AFR #6851 • 4.540 bore, Fel Pro #1017, AFR #6850 • Mark V-VI-up to 4.500 Bore Fel-Pro #17048 or #1047 • Mark V-VI-4.500 to 4.600 Bore Fel-Pro #17049 • Head Bolts & Studs Standard ARP, AFR #6308 & #6307 • Head Bolt Washers Manley, AFR #6320 • Stud Girdle AFR #6210 • Sugg.. Manifold Edelbrock #2907 & #2927, AFR #5500 & #5502 |
• Dart #6200, #6201, #6202 & #6203 • Brodix HVH #2000, #2001, #2005 & #2006 • Spark Plug Starting Range Champion C59C Autolite 3932 • Combustion Chambers 119cc • Spring Pocket can be cut to 1.750, no deeper. • Valve Spacing Standard • Rocker Arms Standard • Valve Angle 24°/4° Intake, 15°/4° Exhaust • Angle Mill (milling available), 102cc Maximum .009” per cc • Flat Mill (milling available), 114cc Maximum .006” per cc |
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HEAD COMBINATIONS WE HAVE IN STOCK | |
| Part Number | Serial Number | Runner Volume | Combustion Chamber | Plug Type | Qty. | Head Description |
| 2010 | 1113 | 357cc | 121cc | Straight | 1 | BBC 357cc CNC Ported, 8035 - Upgrd. Spr. 8001 to 8031, 7626 - Std. Int. valve SST-Cr Stem, 7631 - Std. Exh. valve SST, 8511 - Std. Stl. 10 Deg. Retainer, 9062 - Std. Int. Seats 2.450 OD, 9064 - Exh. Seats 2.000 OD. |
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