Since there isn't an aftermarket timing set out yet, I'm stuck. I checked the part number on the crankshaft timing gear, S415 - 1969 to 1977 250 ci motor. I've read on this forum that the later timing sets retard the timing for emissions. I would have never known that info if it weren't for this forum; this place is priceless! Well, I didn't think to check the part number on the cam gear. I wonder if it's possible to use the wrong gear. Would a 200 camshaft gear fit?
I just installed CSC-264/274 (110*) Hydraulic Dual Pattern Camshaft and dialed it in to learn that it's 4* retarded. I've double checked this and studied Clay Smith video in detail. Intake came out at 114* and the exhaust at 106*. 114-106=8/2=4* the larger number on the intake side means that it's retarded.
Now here's my problem:
I can't get the motor to idle well unless I'm running s#!+load of static advance somewhere in the neighborhood of 24 degrees. Anything less than that the vacuum drops real low and idles very rough or not at all. I've checked the TDC mark with the head off using a dial indicator and it's dead on.
When I run the motor around 2500 rpm after about 2 minutes the headers start to glow RED HOT, the water temp spikes and the radiator spews!
I am using a DUI distributor with the vacuum disconnected. With the dizzy connected to manifold vacuum, I can turn it clockwise, retard it a bit, and still idles well, but I get the same results = RED HOT.
I replaced the head with Offy triple intake with my stock head from '66 200 engine running single autolite 1100. Checked for intake leaks, got none. I cc'd the head, piston/deck and took head gasket into consideration and running 8.9 to 1 compression. Using adjustable rockers, the motor is new, the radiator is also new and borrowed from my BB Cyclone. The only other thing I can think of is that the carb is too small and running lean.
Unless I can get a timing set that I can adjust, I thought about mixing and matching parts. Any suggestions would be greatly appreciated. help
Thanks,
I just installed CSC-264/274 (110*) Hydraulic Dual Pattern Camshaft and dialed it in to learn that it's 4* retarded. I've double checked this and studied Clay Smith video in detail. Intake came out at 114* and the exhaust at 106*. 114-106=8/2=4* the larger number on the intake side means that it's retarded.
Now here's my problem:
I can't get the motor to idle well unless I'm running s#!+load of static advance somewhere in the neighborhood of 24 degrees. Anything less than that the vacuum drops real low and idles very rough or not at all. I've checked the TDC mark with the head off using a dial indicator and it's dead on.
When I run the motor around 2500 rpm after about 2 minutes the headers start to glow RED HOT, the water temp spikes and the radiator spews!
I am using a DUI distributor with the vacuum disconnected. With the dizzy connected to manifold vacuum, I can turn it clockwise, retard it a bit, and still idles well, but I get the same results = RED HOT.
I replaced the head with Offy triple intake with my stock head from '66 200 engine running single autolite 1100. Checked for intake leaks, got none. I cc'd the head, piston/deck and took head gasket into consideration and running 8.9 to 1 compression. Using adjustable rockers, the motor is new, the radiator is also new and borrowed from my BB Cyclone. The only other thing I can think of is that the carb is too small and running lean.
Unless I can get a timing set that I can adjust, I thought about mixing and matching parts. Any suggestions would be greatly appreciated. help
Thanks,