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GILBERT CHEVROLET - AFR 305CC AS CAST MAGNUM BIG-BLOCK CHEVROLET HEAD | |
| AFR’s 305cc “AS CAST” magnum big-block Chevrolet cylinder heads. This line was designed to optimize low and mid-lift airflow, while still generating impressive peak figures. 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 305CC RECTANGULAR AS CAST MAGNUM BBC HEAD DESCRIPTION | |
| AFR’S TORQUE MONTER | |
| This is the smallest intake volume runners in AFR’s line-up, but don’t let size fool you. AFR’s 305cc “As Cast” or fully CNC ported 315cc cylinder heads will provide you with flow numbers most medium sized heads, and some larger, can only dream about. This line was designed to optimize low and mid-lift airflow, while still generating impressive peak figures. Their application should be focused on smaller cubic inch Big Blocks (396-502), with a primary operating range of 2500-6800 rpm’s (this range is an average and will vary with engine displacement as well as component selection). These heads should also be given strong consideration in larger street driven or marine applications up to 555 CID, where low rpm power and driveability are a factor. The 315 version is extremely versatile with its incredibly strong low and midlift airflow figures as well as peak numbers approaching the 400 CFM mark. Either one of these two cylinder heads would be a great choice if your looking for big torque, strong low rpm performance, and still have good rpm capabilities. Both the 305cc and the 315cc come standard with AFR’s trademark .750” thick head deck, reinforced rocker stud bosses, and are equipped with premium one piece stainless steel 2.250” intake valves and 1.880” exhaust valves. Standard combustion chamber volume is 119 cc’s on the 305 “As Cast” pieces, while our fully CNC ported 315cc version comes with a 121cc chamber. Both are available with an optional 114cc combustion chamber as well. |
 Notes: Properly selecting the correct cylinder head for an application depends on a large number of variables. Please consult with one of GILBERT CHEVROLET’s sales technicians to help assist you in making the best decision for your particular application. 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, 2.250” stainless steel, AFR #7620 • Exhaust Valve, 1.880” stainless steel, AFR #7630 • 1.550” OD Roller Dual Valve Spring with dampener, 240 lbs. on seat, .750” maximum lift, AFR #8003 • 10º Chrome Moly Retainers, AFR #8511 • 10º 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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SPECIFICATIONS, FEATURES, AND SUPPORTING COMPONENTS | |
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• Head Torque 75 Ft. Lbs. • Intake Port Gasket, 1.700” x 2.430” with 1/2” radius AFR #6855 • 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 #6306 • 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 24º/4º Intake, 15º/4º 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 |
| 2100 | 937 | 305cc | 119cc | Straight | 1 | As Cast With Parts, 119cc. Option Flat Mill To 112cc. |
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