02-01-2012, 09:33:54 AM
what is the total timing range on a mild sbc with vortec heads? i set the initial at 10*, but i thought i read that the vortecs like less timing (roughly 30-32) than the 34-36 range. this is my first set of vortecs, so i want to make sure i do it the right way...thanks guys
02-01-2012, 10:15:21 AM
Gasoline, Compression, proper quench, A/F mixture, load & a few other things determine the proper timing.
Easiest way to find out is at a test n tune at the dragstrip.
Keep advancing the timing until the MPH falls off them back it up 2º
Of course use the gas you normally use and if it pings or knocks back it up until it stops, or step up to premium fuel if you are using 87 octane.
02-02-2012, 07:37:54 PM
They don't "work better" with less timing than most traditional heads, its just that there aren't really any gains by going higher. Vortec heads usually make the best power around 32* or so. You can go higher, into the 36-38 range that most traditional small block heads like, but you won't gain anything by doing so.
02-03-2012, 10:53:07 AM
When Car Craft did their article "Humble Pie" on the 350HO engine (using Vortecs) they set their timing to 37 degrees.
I have heard 32 degrees is recommended by several but I was surprised to see this number (37) in that article.
02-03-2012, 11:58:01 AM
thanks for the input guys. someone also said they set theirs at 37* also, but for the most part, i have read 32-33*. ill throw the light on and see what happens
02-03-2012, 08:53:34 PM
Every engine is different. My 350 vortec is at 28, but most I've seen and heard of are around 32. I would start at 32, and play with it from there. Vortecs can handle compression and low octane real good. hhott71 described the easiest way to do it without paying for a dyno tune.
02-04-2012, 08:22:20 AM
On the dyno with a good fuel curve we only see around 29 to 31 degrees for peek power.