1960 Corvette Engines
The actual 1960 Corvette engine horsepower ratings were the same as 1959.
283/230.. base engine..single 4-bbl carb, standard hyd. cam. Also was optional in the 1960 full size passenger cars.
283/245.. base engine plus 2X4bbl carbs and premium bearings.
283/250.. essentially the same as the 245 horse 2X4bbl engine except with fuel injection replacing the carbs.
283/270..essentially the same as the 245 horse 2X4bbl engine but with the famous sold lifter Duntov cam instead of the hyd. cam.
283/290..top dog fuel injected 283 with fuel injection, solid lifter Duntov cam and a higher 10.5 compression ratio.
Although early 1960 consumer and AMA specs show the fuel injected 250 horse and 290 horse engines bumped to 275 horsepower and 315 horsepower respectively with the addition of a new aluminum larger valve (1.94/1.50 instead of 1.72/1.50) head, it didn't happen. The new aluminum heads failed in testing (leaked coolant inside and outside the engine) and were not released. The larger valve head was re-cast in iron for the 61 injected 283 engines which actually did have the higher 275 and 315 horsepower ratings. This new '61 1.94/1.50 valve head was the first "double hump" version. For the '64 model year an even larger valve (2.02/1.60) "double hump" head was released for solid lifter Corvette 327s although the 1.94/1.50 version was still used on the 327/300 engine. The original 1.72/1.50 valve head was still being used on the 327/250 and 283s.