. . So it seems my project has taken yet another turn...a turn for better. I'm finally building what I know my heavy 81Z needs... a 400 SBC! Basic parts list: Stock 2-bolt 400 block @ 4.125" bore. Will keep overbore to minimum. Stock 400 crank. 5.7" rods. Vortec heads. Factory iron. Reworked to handle high lift roller camshaft. Pistons: Will be forged. D-dish (or similar) to get desired C.R. GMPP dual plane Vortec intake. Q-jet carb. Headers. Build Specs: 9.5 - 10.0 Comp Ratio. 0.045" - 0.055" quench height. 5800-6000 rpm MAX. Street driven car only. 3.42 gears with 700R4 and 2500 stall with lockup (existing setup). Characteristics that Hydraulic Roller Camshaft must be/create: Camshaft will be hydraulic roller (retrofit). Lifters will be retrofit type. Needs good vacuum for power brakes. Good idle. A slightly menacing sound as if it sounds like it's got a stick in it would be cool. But nothing too lopey or crazy. Car is emissions exempt. I have done a great deal of searching on this site of owners who have/had a 400 SBC with factory iron Vortec heads. Many of you here have had great success with iron Vortec heads on a 400 SBC. Several user profiles come to mind. The Vortec sticky atop the Engines section has proven invaluable; thanks Dirt! Many have stated that a 400 will swallow a lot more cam than one would expect when upsizing from a 350. Almost every cam I've seen spec'd out for an iron Vortec 400 was either a hyd. FT or solid FT. . . I'm having a hard time specing out a hydraulic roller camshaft for my 400 SBC. . . Anyone want to take a kick at the can and recommend/suggest a hydraulic roller cam for my iron headed Vortec 400??? . . Thanks Project thread link soon to be updated.