Absolute Speed Stage 2.5 LS6 243 castings.The intake valves are 2.055" exhaust is 1.60" and the bore was opened up for 3.905". They are setup for a 383 Stroker or larger. They would kill low end power on a stock ci motor. Springs are Comp 977's
FLOWED 318 @ .600 but I don't remember the other flow numbers
with rockers & they are Yella Terra $1500.00 obo