My 327 has a 1966 block and balancer- it's the old 6 3/4-in balancer that is about half as thick as a modern balancer. The timing tab on the original engine was welded to the timing cover - as the timing cover was trashed, I replaced it. The one in the photo below, which is a stock GM unit, completely covers the timing mark on the balancer I can't find a bolt on timing tab that will work with that balancer type in. Does anybody know of one, part number?
All sorts of bolt-on tabs for the 8" dampner...check this link: Bolts on the timing cover, no modifications and looks good. bolt on sbc timing tab - Google Search
https://www.summitracing.com/parts/...DadGlqL9D4gSUtcSfRuMG6xUrQQUBp0oaAlOgEALw_wcB https://www.summitracing.com/parts/mrg-4593/make/chevrolet https://www.enginelabs.com/news/what-i-learned-today-with-jeff-smith-dont-trust-timing-marks/ https://shop.advanceautoparts.com/w...age/13970/large/5027756_mrg_4593_pri_larg.jpg
I use one of these: https://www.speedwaymotors.com/6-3-...rgV2P7wcOPAySwR7LT9eBq_JpoIdD2BgaAoo8EALw_wcB And an adjustable timing pointer: https://www.jegs.com/i/JEGS+Perform...gRZxBA8XRMYp-NnLIO1aFC4GLeluToGUaAmYFEALw_wcB It makes it easy to set total timing (static plus mechanical advance) at 34 degrees.
Keep in mind the bolt on timing tabs (in general 69/later) were originally paired with a damper that is keyed roughly eight degrees off the early damper which has an inline timing line and keyway.
I saw those...all for 8" balancers. That article is great, 'cept for that he doesn't spec a part # for an add-on tab
...and that's part of the problem. I'm going to use a piston stop and determine the actual timing mark.
Here's an interesting way to mark balancer: https://www.jalopyjournal.com/forum...ille-coupe-more.1130751/page-13#post-15051040
Drill a hole at 4 degrees (or wherever you set your timing) so you can see the timing mark. Could be a bit tricky shining the timing light through the hole, depends on how close it is to the edge of the balancer.
I make a pointer from a piece of welding wire and point it at TDC and use timing tape on the balancer if it’s not a 360* marked one. I paint the end white. I also do it on ***embly when I determine TDC…not a SBC but you get the idea..