Vortec Heads - Big HP Jump!
This forum has helped me so much, glad to give some advice (instead of just taking it!).
65 Impala Convertible, love this car. Original 283 gone before I purchased, replaced by '72 SBC 350, with stock 882 smogger heads, stock cam, 75 Qjet carb., 69 Corvette/Camaro intake (3927184), stock exhaust manifold. Ran smooth, but not much power, 0-60 in around 12-13 seconds with stock 2 speed Powerglide.
Bought JEGS headers, and a set of Vortec heads (062) from local junkyard, along with Edelbrock Vortec intake. Yard pressure tested and guaranteed heads. My mechanic cleaned up heads, and installed everything. Feels like an entirely different car! Great acceleration, much, much faster, new 0-60 is 8.5 seconds!
I had read a lot about these Vortec heads, and it was all true. Installing them along with headers, feels like I gained 100 horsepower, pretty cool.