I've continued on tuning isues. At 3000rpm she wants to act up a little. Put the hammer down a she does a little better. Vacuum readings at idle are at most 14 inches of Hg while setting the idle jets. 390 cfm holley carb on a heated manifold. 195 degree thermostat. Float levels are good. At the moment I'm running straight exhaust with about a 2 foot pipe, dual cast iron headers. Its so loud that I'm not sure I can really hear the valve lash when I try to set them. Hydraulic. Maybe I need some mufflers for back pressure before I get too far into diagnosis. The head was milled 60 thousanths, block zero decked, pistons, rods and crank all balanced. I think the original intake valves were 174's , I went to 194's kept the 150 exhaust valves. Valve throats were opened up on the intakes, unshrouded I guess. Still using the dished pistons.
Gimme any knowledge I'm missing. I'm not a carb man. Its a 1970 C-10 long stepper. Cranks, idles and revs great.
Thanks Gentleman.
Last edited by zebco; 09/20/12 06:29 AM.
