Hi all...Just recently picked up a 69 rs/ss 396/350 stock. At high rpm's it seemed to have a little valve rattle, so I proceeded to check the dwell and timing. Dwell was set at 11 and timing at TDC. I tried setting the dwell to specs 28-32 and adjusted the timing. The motor wold break down badly. So after an hour or so of playing with this, I ended up setting the dwell at 12 and timing at TDC. Runs fairly good. Whats up with this????
With #1 at TDC the mark on the harmonic balancer is lined up with the TDC mark on the degree indicator tab. It's been a long time since I've worked on these cars, so I'm a little rusty. Needless to say this has got me realy confused.
I hate to pop in without positive info but it seems to me I ran into this problem back in the 70's and it was because of excessive shaft end play. Setting the gap statically seems like it should be in the ballpark but then cranking it and using the dwell meter showed variations that shouldn't have been there that the engine shouldn't have been able to run on. Changed to an HEI and never looked back.