I have a Demon 750 DP carb on my Z which is also a 4 speed car.Do you recommend I run a vacuum advance distributor or a non vacuum(just mechanical)advance distributor?Pro's and Con's of each?Car is mainly street strip toy,not daily driven.Rpm range is 2,000-6,000,3.73 gears,3300 lbs with me in it.TIA

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1982 Z28:355,4 Speed,Lots of bolt ons

 

I'm no expert on distributors sorry, but by mechanical advance does that refer to computer control. If so then you'll need a vacuum advance one since you don't have a CC carburetor.

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"Rice burners are like tampons...Every pu$$y has to have one"
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

No,mechanical advance doesn't refer to computer control.Computer controlled distributors have no advance mechanism whatsoever,they are controlled and advanced only by and through the ECM.I have a vacuum advance on my car,I was wondering which was better for it.I did a search in the tech section and got my answer from Damon Nickles HEI Performance article(should have looked there first).Thanks for the reply though,much appreciation.Like the rice burner analogy..nice!

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1982 Z28:355,4 Speed,Lots of bolt ons

 

I run my 383 daily with a 13 degrees initial, and a 34 total. Yet I am running 10.7 compression also, so chances are you can get more out of yours. You will loose some gas mileage, and some slight partial throttle response, but for what you want, you should be fine.

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350 4 bolt main, Speed-O-Motive 383 stroker kit, re-sized rods ground for clearance,TRW Forged pistons,10.7:1 compression,HPC Coated RPM intake, Holley 750 cfm carb,World Products Sportsman II heads,2.02/1.60 valves, Comp Cam 1.6 roller rockers, Comp Xtreme 284 cam,240/246@.050 with .540 lift,Crane pushrods,ATI damper,Proform HEI and MSD6A box,HPC coated 1 5/8 headers, 2.5" exhaust with 40 series mufflers,TH350 with Hughes 3000 stall, Powertrax NoSlip Locker, 4.11 gears.

 

It kind of depends on several things. No, it is not required but it makes it easier to drive when cold and at light throttle openings. If the cam has lots of duration, it will like a little vacuum advance. But if you have high compression, it probably won't stand it without rattling on 92 octane. Whats it drive like at light throttle openings?

If its not your daily d, i would play with the mechanical curve to make up for no vacuum. Just make the curve as fast as you can without detonation and it will just about be the same in the long run. Especially with a decient gear like a 3.73.

[This message has been edited by jcb999 (edited October 22, 2001).]