So I’ve got a recently built 340 with a Comp cam in it with 274/286 of duration and 488/391 lift. It only makes around 8-10hg of vac at idle, and I’m pretty sure there are no leaks and compression is good. I’ve got it set at around 13-15 initial and 28 total right now, which is as far as my current mechanical will allow right now. That level of vac is about as much as I’ll get.
Now I didn’t build the engine but the car runs good and it has the standard electric conversion kit on it with a blue box and a no-name (proform?) distributor. (Sorry for the bad pics but perhaps someone can confirm this?)
The vac advance is useless at idle as it won’t do anything below like 15hg (I’ve checked this). So I’m now debating with myself what to do in order for me to be able to work with timing a bit more. I think my options are to 1) just skip the vac advance and work with the mechanical advance on my current distributor. (But what springs to use if I don’t even know the brand and version of the distributor!?) 2) get a vac can that triggers at a lower vacuum and keep my current distributor (but those seem hard to find), 3) buy a new all mechanical distributor to replace my no name one and keep the rest, or 4) replace the entire system and go to like MSD.
What would you guys recommend? As mentioned the car runs good, but again I don’t know if I’m leaving HP on the floor by not being able to adjust timing more…?
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