The 390 4V has a bore and stroke of 4.05 inches by 3.78 inches. The GT, PI and HP versions have horsepower ratings from 300 to 375 hp at 4,600 to 6,000 rpm. Their torque ratings are 427 pound-feet at 2,800 to 3,400 rpm. Their compression ratios run from 9.6:1 to 10.6:1.
I was wondering about what pistons to go with for my mild build. I was hoping to go with forged, possible 10.5:1 compression, comp 268 cam, edelbrock intake, hooker longtubes, holley 750.
the machine shop is recommending hypereutectic pistons for the build, claiming possible 9-10:1 ratio
parts alone for: arp main bolts and rod bolts, better clevite bearings, keith black pistons .030 over, double roller timing, piston pin bushings... that is all that he named.
the price for him from summit as a dealer was $754.12
does this sound correct? i saw forged speed pros, flat with valve reliefs for $330 shipped. he claims speed pros are not very good.
I have to go in saturday to look everything over and pay for the parts without any labor yet..... I wondered if i should buy everything myself.
what is everyone's opinion?