The Stovebolt Site Forums The Shop Area Engine Shop Flywheel TDC timing marks ?? on 216 to 235 swap

Hello everyone. This is my first post to this forum and it seems to be a great group of knowledgeable people here. I am in the process of doing a '61 235 engine swap into my 53 chev 1/2 ton and have a question. I finally got the 235 back from the machine shop and everything is bolting back together. I am using the original 216 bellhousing and flywheel to keep the original foot starter. The flywheel is indexed and bolts in only one way but when I went to do the static engine timing there seems to be a problem. I am setting #1 TDC by lining up the crank and cam sprocket dots and was expecting to see a corresponding TDC alignment mark on the flywheel but I am not. The flywheel has the marks of U|C, a triangle, and then the BB. At TDC, the bellhousing pointer is a couple of inches from the triangle. I thought the triangle meant TDC and the BB was 5 degrees before TDC which is where you would time the ignition. I could just re-mark TDC with paint on the flywheel but really want to know what is going on here just in case I'm doing something wrong. As is, I couldn't use the BB as a timing reference either.
:confused:

The UC stands for upper center, the way chev called TDC at that time. The triangle is for checking cam timing and is explaned in the shop manual.I believe 216 are timed at 5 degrees before and 235 are timed at TDC originally, so you will get the best performance seting the timing by ear.