The Chevy 302 is before the 305 if I remember correctly....early 80's or something. Opps....I stand corrected
Late 60's ONLY Camaros/T.A.'s, and it was later turned into the 307, NOT the 305 like I thought. I had a 77 Camaro that had the 305(5.0) and I thought it was the decendant of the 302.
302
Chevrolet produced a special 302 in³ (4.9 L) engine for Trans Am racing from 1967-1969. It was the product of placing the 3-inch stroke crankshaft from a 283 into a 4-inch bore 327 block. This engine was only used in the first-generation Camaro Z28. Conservatively rated at 290 hp (216 kW), actual output was around 360 hp (for the standard 4-barrel carb) to 400 hp (with optional dual 4-barrel carbs and other performance parts checked off on the option list). This block is one of 3 displacements that underwent a transformation for the 1968/1969 period when the main bearing size was increased from 2.30 in to 2.45 in.
307
A 307 in³ (5.0 L) version was produced from 1968 through 1973. Engine bore was 3.875 in (98.4 mm) with a 3.25 stroke.
The 307 replaced the 283 in Chevrolet cars and produced 200 hp (149 kW) SAE gross in the 1960s. The later emissions-modified versions produced just 115 hp (86 kW) SAE net, giving the engine one of the lowest power-per-displacement ratings of all time. Chevrolet never produced a high-performance version of this motor, though they did produce, for Outboard Marine Corporation, a high-performance marinized 307, rated at 235 and 245 hp SAE gross, depending on year, that shipped with the Corvette/Z-28's cast aluminum valve covers and Rochester QuadraJet carb. Chevy also built other versions of the OMC 307 rated at 210, 215 and 225 horsepower SAE gross.
The 307 was also unique in the fact that its casting alloy had a very low nickel content making it relatively soft. Due to this fact, this engine has low value among rebuilders because of reduced longevity
305
The 305 variant of the small-block Chevrolet was bored and stroked to 5.0 L (305 in³) with a 3.74 in (95 mm) bore and 3.48 in (88.4 mm) stroke - taken from the 350. Some performance enthusiasts have noted a marked resistance to performance upgrades in the 305[citation needed].
Although the 262 was underpowered (it was not used in other vehicles with a wheelbase greater than 110"), GM engineers decided to increase the 262's bore from its 3.671" diameter to 3.736" while the 3.10" stroke cycle was too short - the solution, incorporating the 3.48" stroke from the 350.
Induction systems included carburetors (both 2 and 4-barrel), throttle-body injection (TBI), tuned-port fuel injection (TPI), and sequential fuel injection (GM Vortec).
After 1996, its usage was limited to light trucks and SUVs as the Vortec 5000.
