The Ford Barn

Lawrie · 04-09-2020, 01:43 AM

I,m building a 276 engine in my shop, I am using a stock Ford cam and lifters,
Good used Ford timing gears,
Today I checked the valve timing,well not the actual opening and closing times but the overlap method by measuring the amount off the seat (equal amount) when the exhaust is shutting and the inlet is opening,
I,m using two valves with the heads machined down so they will go down inside the seat and sit on the lifters with NO clearance, a dial indicator on each valve and a degree wheel on the crankshaft, tdc set via a positive stop and dial indicator on the piston.
I am sure this point of overlap should be at TDC, BUT is 3 deg after TDC.
This engine will be going in our 33 and spend most of its life towing the caravan ,so mostly around 2500 rpm, stock 97 carb and 33 manifold.
Should I take the time to correct this ??
I think a few more hours wont mater as I just spend two days fitting up the floater bearings.(we are stuck home with the Virus so time is not a problem)
I think I read some where that timing like this after TDc makes for better higher RPM and before TDC makes for more torque
what do you think.
Ron, JWL,Gofast,Pete, and others
Lawrie

04-09-2020, 01:43 AM	#1
Lawrie Senior Member Join Date: May 2010 Location: Qld, Australia Posts: 4,218	Valve timing I,m building a 276 engine in my shop, I am using a stock Ford cam and lifters, Good used Ford timing gears, Today I checked the valve timing,well not the actual opening and closing times but the overlap method by measuring the amount off the seat (equal amount) when the exhaust is shutting and the inlet is opening, I,m using two valves with the heads machined down so they will go down inside the seat and sit on the lifters with NO clearance, a dial indicator on each valve and a degree wheel on the crankshaft, tdc set via a positive stop and dial indicator on the piston. I am sure this point of overlap should be at TDC, BUT is 3 deg after TDC. This engine will be going in our 33 and spend most of its life towing the caravan ,so mostly around 2500 rpm, stock 97 carb and 33 manifold. Should I take the time to correct this ?? I think a few more hours wont mater as I just spend two days fitting up the floater bearings.(we are stuck home with the Virus so time is not a problem) I think I read some where that timing like this after TDc makes for better higher RPM and before TDC makes for more torque what do you think. Ron, JWL,Gofast,Pete, and others Lawrie