You need to look at ALL of the casting identifiers before making your determination. 3884520    283, 327, 60cc, some made in canada       Truck  Oval Port 3919842    396-427        68-69

The exhaust ports and exhaust manifold-bolt holes are in the same location.                 75-76 3747460    283, 327, 59-67         76-84     Truck HD

different area of the block on the flange edge of the rear of the block, near the bellhousing mating rocker arm valley. 3998997    350, 400, 76cc, 72-73, hard seats in 73 center bolt VC Aluminum, 58cc, angle plugs, raised runners, d-port exhaust, 1.94 and 1.50-inch valves. 3856260    396 3837064: 1956 through 1962 265ci or 283ci, 60cc chambers, 1.72/1.50-inch valves. Used on LT5 in Corvette ZR1.

343771      366-454 12516852: 1987 through 1994 350ci, 76cc chamber, 1.94/1.50-inch valves. 14085963: 1986 350ci, 76cc chambers, 1.94/1.60-inch valves. If the block has been side, aluminum10174390...91-95...350..........LT5, ZR1, DOHC, 32-valve, pass.

14019924: 1979 through 1981 267ci, 58cc chambers, 1.71/1.50-inch valves. 10051101    Bowtie, Alm, angle plug, 55cc, raised runner, 196cc intake port 10174389: 1991 through 1995 LT 350ci V-8.

           Oval Port

3973414: 1970 350ci, LT1, 64cc chambers, 2.02/1.50-inch valves. You may have to move the alternator to be able to read this engine

330545: 1973 350ci, 76cc chambers, 2.02/1.60-inch valves.            Sq. 3836839    265, 55 340        320/120cc port 10134352    Bowtie, Lo port, alm. 3932441    350, 76cc, 161-165cc intake port

Used on LT5, Corvette ZR1.

3731762: 1956 265ci, 68cc chambers, 1.72/1.50-inch valves. 3758379    348 14010201    305, 84 Your's 280        256/114cc port This drawing is of the 1967 version of the 302 cid Chevrolet.                 71 "CONV" is just a foundry mark and is NOT an indicator that the motor was originally installed in a convertible. 10106179    350, 90, LT5, ZR1, DOHC, 32 Valve, Driver Side 14102187    305HO, 87-91, 1.85-1.5, 58cc, 7 bolt ex. SB2.2 head 48 ~ 54 CC angle plug 284 CC intake runner Bare heads.

3755537: 1957 through 1962 283ci, 1.72/1.50-inch valves. 215        256/114cc port            Oval Port

3932441: 1969 and 1970 350ci, 76cc chambers, 1.94/1.50-inch valves. Aluminum, reverse-flow cooling.

180cc intake port 290        256/114cc port Port 3917291: 1967 and 1968 302ci, 327ci and 350ci, 64cc chambers, 2.02/1.60-inch valves. SEMA 2020: Stay Cool With DEI’s Black Floor & Tunnel, Carlisle Events Announces 2021 Event Schedule, And It’s, Bringing The Show To You: PRI Embarks On Cross-Country Road, Heidts New Four-Link Wide-Tire Mini Tub Kits For Early, Strapping Your Race Car Or Hot Rod To A Trailer Just Got, PerTronix Flame-Thrower Ignition Wires: The Perfect Wire For Your, SEMA 2020: Flaming River’s Microsteer Electric Power, Vengeance Racing And Huron Speed Team Up For An Epic ZL1, This ’71 Chevelle is A Candy Apple Cool Show, Street Dreams: Daryl Whitlow’s Twin-Turbo 1970, SEMA 2020: Taylor Cable Shows Up And Shows Out With Ignition, PRI 2019: CP-Carrillo Debuts Two New Connecting Rod, PRI 2019: Melling’s New High-Volume, High-Pressure Oil, PRI 2019: New Rocker Arms For Trick-Flow BBC, SBF Heads From, How Ken Lingenfelter’s Love for Corvettes Benefits So, Ray Evernham’s Ghost: A Frightening Blend Of Old And, Point of Pride: The Untold Story of Street Outlaws’ Kye, High-Performance Racing Fasteners: How ARP Fasteners Are, Schwartz Performance Talks G-Machine Chassis, Engine Pulleys — Old-School Tradition Meets New-School, Rare Rides: The 1969 Chevrolet Camaro COPO, ED-OP: Is The Evolution Of Building Horsepower A Good, SEMA 2020: Stay Cool With DEI’s Black Floor & Tunnel Shield, Carlisle Events Announces 2021 Event Schedule, And It’s Huge, Bringing The Show To You: PRI Embarks On Cross-Country Road Tour, How To Catch Distributor Gear Wear With Performance Distributors, $10K Drag Shootout 3: Episode 1: “10K Or Nothin'”, SEMA 2020: Flaming River’s Microsteer Electric Power Steering, Budget Friendly Power: The LS1 Enforcer Cylinder Heads From AFR. 3912311    327, 67 3927188    307, 74cc The first generation that started it all in 1955, remained in effect until 1992, when the second generation (LT1) was released. This head was sold as a bare casting when new, so machine work will determine finished valve, chamber, and port sizes. 3931633: 1968 through 1973 307ci, 1.72/1.50-inch valves. 14102187: 1987 through 1991 305ci, 58cc chambers, 1.84/1.60-inch valves. 3767465    283, 59-61 3927185    307, 327, 69cc, 69-70 3795896: 1963 through 1965 283ci, 60cc chambers, 1.72/1.50-inch valves. 330865      366-427 3795896: 1962 through 1964 327ci, 60cc chambers, 1.72/1.50-inch valves. Chevrolet Head Casting Number Reference Small Blocks 330545 350, 73, Corvette, 76cc, 2.02-1.6 …

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