I freshly built a 312 for my car. I have read the archives and cannot find info regarding the engine vacuum to cam advancing changes.



I tow a T@B trailer with the car. The trailer weight is 1500 lbs dry and 1900 fully loaded. The car has FMX hybrid transmission with 57 wagon Ford 9 inch with 3.25:1 gears. Power disc brakes Granada setup and 64 Ford wagon rear drums 2.5"X11"



I am looking at advancing the camshaft about 4 degrees to get better bottom end, engine is wild and will spin tires at each shift except start off.



The question I have is if I advance the camshaft for better bottom end torque how will this affect my vacuum for my power brakes? Do you think I should go less than 4 degrees as I can set it at 2 degrees on the Roll-master chain? Any other ideas?



I don't have a degree wheel however I have lots of dial indicators and used them to get TDC and valve over lap on #1 and #6

The dampener is new and right on for TDC. When the valves were in overlap I found it was advanced about 0.5 degrees on the dampener, engine vacuum is about 17" and compression 135# even across, valves setting at .017" cold



Details of engine below.

The engine is .030 over with flat top pistons, block decked to 20 thou above piston, heads milled 3 thou, (thickness still showing 1.00" on calibration blocks) engine set up to get about ~.040 piston to head clearance to run steel shim gaskets.

C1TE rods, aligned, shot peened, side polished, balanced big end/little end, re-sized, ARP bolts, new bushings,

ARP head bolts and ARP main studs

crankshaft .010/.010 Best gasket seal and all rotating assembly full balanced

camshaft is Isky E4 with new lifters and new 1.54:1 rockers and shafts, heavy push-rods and Rollmaster timing chain.

heads are ECZ-G with new stainless valves, hard seats, 105# valve springs and one piece retainers, no porting done,

wide back exhaust manifolds,

B intake manifold

C6PF Autolite 4100 carb 1.08 venturis

MSD distributor, coil and wires.



thanks

marv