ok i just built my 355 sbc with the 268xe comp cam. they state that 10-12 base timing and total of 34 by 3000 rpm. how do i limit it to the 34*? last motor i had i couldnt get the total under 42* killing performance and fuel mileage. im using same unit so id rather nick it in the butt now then later. any help? im using an aftermarket billet hei unit WITHOUT vaccum advance. thanks!!

 

It should come with different size bushings to limit travel.

 

i have this distributor. didnt come with bushings. http://www.ebay.com/itm/SBC-BBC-CHEVY-350-383-SUPER-65K-HEI-DISTRIBUTOR-6500-R-/331066061910?pt=Motors_Car_Truck_Parts_Accessories&hash=item4d15133456&vxp=mtr#ht_8279wt_1364

 

delete

 

Just read your link, doesn't mention a manufacturer, doesn't show a pic of the weights and springs. Call his tech line. All the ones I've dealt with have bushings that limit the advance weight travel. What ignition system are you running?

 

i have the msd 6 al ignition box

 

So you have no computer. Does that dizzy have weights and springs?

 

I'd bet money based on the quick description it's a Procomp distributor in which case these have been well known to cause issues like he is experiencing.

Yep Skip White. Lol. Definitely Procomp.

 

yes its procomp. its setup like a normal distributor. i believe it has weights and springs.

 

You will need something like this

http://www.summitracing.com/parts/su...Fe1QOgodNRQARg

Why did you go without vac advance?

 

MSD Advance Kits 8464

• Click to Enlarge Image

 

I think those are for non HEI MSD distributors only

 

Possibly, your link doesn't have any adjustable bushings with it, the plastic bushings they mention are for wear on the pins.

Can't find a pic of what the setup looks like on his diz. I'm sure he could mod something up.

 

That is because it is for an HEI

http://static.summitracing.com/globa.../sum-g5212.pdf

 

With those choices, how does he get 12 initial and 36 total?

 

Buy an MSD Dist. now, those dist are junk, you will keep having issues until it is replaced. imo

 

i havent ran vac advance on any of the motors i had. guess it just became a habit not to. so with that kit i just put the springs in from the chart and thats where it will stop advancing at? i believe i have that kit at home somewhere.

 

 

It is hard to limit the advance on cheap HEI distributors.

http://www.camaros.net/forums/showthread.php?t=119691

Otherwise you reduce initial timing but add lighter springs so at idle the weights move more

If you want full adjust ability you need a MSD system.

Change the springs and see how it works it will be some trial and error.

 

ok ill look into an msd dist. so if i dont do springs and weights ill have to basically have a low base timing to reach the inital mi want/need?

 

also i have the msd timing control that goes inside the car. how can i lock the dizz at 34* so it stays there at all times? or is that a bad idea? i could retard it in car to start and then turn it back once starts.......