yankees

Timing with stock 350 2 bbl auto was 6 degrees @ 800 and 10 degrees @1100. The same timing of 6 degrees and 10 degrees with the vacuum hose removed and plugged. Does that sound right for a 350 stock 2bbl with true dual exhaust, stock points distributor and using manifold vacuum?

RetroRanger

maybe

is it the stock points distributor

is your vacuum advance connected to ported or manifold ?

does your vac advance work ?

I would kinda expect to see different readings at both rpms if the vac advance is connected to manifold vacuum but if connected to ported maybe it wouldnt change at 1100 although I think it would

not apples to apples

but my 72 350 has an HEI w moroso advance kit and vac advance connected to manifold vacuum.

initial is ~17°
like yours my mechanical starts early IDK what it is at 1100 but its already moving.
connected to manifold vacuum my vac advance changes the timing w the hose connected vs disconnected

oldcutlass

Make sure your dwell is set to 30 and I show 8 deg btdc @ 650 Rpm with vacuum disconnected.

MDchanic

Sounds like it's working normally, as far as the description goes, but the specified advance in those years tends to be more retarded than would be optimal for performance, fuel economy, and engine cooling.

I'd advance it a few degrees at a time until it pings, then retard it a couple degrees, or, better yet, time it for 36° at about 3,000 RPM (vacuum advance disconnected), and let the idle RPM fall where it may, so long as it isn't hard to start.

- Eric