Initial Timing Issue (a quest for better fuel mileage)

[Fairlane514]

Also the more retarded your timing the hotter the motor will run.

[454Man]

hmm alright thanks 79! i will have to change my timing up to 10* then when i get back this weekend! thanks for the advice! 

I've read that what you want is be fully advanced @32* by x rpms. I've seen people saying it's best to be "all in" by 3000 rpm. That includes your initial plus vacuum. I am sure ill be corrected if I am wrong.

Correct...

[Fairlane514]

When referring to 32 degrees total, that is mechanical timing only, it does not include vacuum advance.

[454Man]

Yes all  mechanical not including vac... This is best achieved by using the 375/41 dizzy center plate and weights from a 80s suburban. I was so skeptical b4 I put them in... Now the truck is a total diff beast. 10 degrees initial, 32 all in by 3k plus 8 degrees vac using the Accel vac can.

Put it this way. B4 I couldn't break the tires loose for nothing.even power braking Now they beak loose from a roll.

[81_Chevy]

so if i went to my local junkyard and pulled the distributor and replaced that center peice (not sure what that is) and the weights (not sure either) i could achieve alot more power?

-Nic

[454Man]

Yes... The parts im taking about are what you'd find in a dizzy recurve kit. , but they have the correct weight abs curvature. the boomerang looking parts are the weights... They will have 41 stamped on them. The center plate is next to them, it will have 375 stamped on it. That is what you want to look for at the yard. This will take all guess work out. Set to 10 or 12 degrees and go... B side the springs to bring it all in by an approx 3k that is it.
All u have to do is take the Cato and rotor off and look at them for those #s

[81_Chevy]

thanks 454! 

[454Man]

No prob let us know when you get them. We can go through the process...

[81_Chevy]

will do! also will i need to get the springs out of it too? and does it matter if its out of a sbc or bbc?

[454Man]

Dave the ignition man says you could use the springs that come with, but Idk about used springs. i got three moroso advance kit and used one light and one medium spring. Once you've gotten set on the mechanical and all is well. Then its time to bump up the power a little more with the vac advance... I choose the accell vac can, because it operates down to 5 inches of vac. This totally its an unrated step. This bumped up the low end tq and part throttle response. with that said every engine is diff. My engine build is 60K into, comp cams 260h, flat tops, bummer tbi heads... a said 9:5 comp. Headers and summit race mufflers backed by a th350. Rolling on 31in all terrains

[454Man]

Oh and long as they have those #s stamped on them get them

[454Man]

Oh and back to your first post. Eddy carb is not a good performer. The q jet is. 25 buck will get you one. Get a 76 qjet. Rebuild it our have it rebuilt... Then you'll see what i'm talking about. I have the Eddy 1406 and its is nothing even when dialed in compared to a stock qjet. Mpgs you may gain 2 or 3... Keep out them secondary:-)