The Ford Barn

40cpe · 06-25-2017, 05:02 PM

I have a 272" that was professionally rebuilt, don't know the rebuilder's credentials. Chasing low vacuum for power brakes, I found it at 13" vacuum at 10 degrees advance and carburetor adjusted to max vacuum. 28 degree dwell. It has a Edelbrock 600 carb. I adjusted valves and raised static time to 22 and got it to 17". I made a 30 mile drive Saturday in 85 degree weather with the AC on and it ran at about 200 degrees. I haven't tried to verify TDC with the bottom pulley timing marks. The radiator core appears new, can't verify that, but all the fins, etc, are as new. What effect would the timing chain marks being off have on vacuum and operating temperature? What more could I check? It has been a long time since I've driven a y-block, but it seems to run, rev, and idle good. Thanks in advance, Gene

06-25-2017, 05:02 PM	#1
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,120	272" y-block cam timing I have a 272" that was professionally rebuilt, don't know the rebuilder's credentials. Chasing low vacuum for power brakes, I found it at 13" vacuum at 10 degrees advance and carburetor adjusted to max vacuum. 28 degree dwell. It has a Edelbrock 600 carb. I adjusted valves and raised static time to 22 and got it to 17". I made a 30 mile drive Saturday in 85 degree weather with the AC on and it ran at about 200 degrees. I haven't tried to verify TDC with the bottom pulley timing marks. The radiator core appears new, can't verify that, but all the fins, etc, are as new. What effect would the timing chain marks being off have on vacuum and operating temperature? What more could I check? It has been a long time since I've driven a y-block, but it seems to run, rev, and idle good. Thanks in advance, Gene