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-   -   ? about what to set the timing at on a 350 sbc. (http://www.hotrodders.com/forum/about-what-set-timing-350-sbc-70818.html)

Streetmaster 09-24-2005 11:29 PM

? about what to set the timing at on a 350 sbc.
 
I just got my (9.1) .030 350 sbc up and running, after changing the head gaskets, and it sound great :pimp: Its got KB120 flats, .010 in the hole. A set of .028 GMPerformance head gaskets, and W/P s/r torquer's with 75cc combustion chambers. A Comp EX270HR with (495in - 502ex) (218in - 224 @50) (110 L/S) (1600 - 5400). The manifold is an Edelbrock performer EPS @ 1" four hole spacer, with Edelbrock 600 cfm carb. The distributor is a Mallory HEI, with a 50,000 volt coil. Well timing a motor was never one of my strong points, so what i've come to know is, to place a mark on the distributor, under the cap, whare the 1# plug wire goes. I then, drop the distributor down in, line the rotor up whare i think it should be,and line the mark on the distributor up with the rotor. Instead of starting the motor up at (TDC) i turn the ballancer to 10 deg, before TDC, line the mark on the distributor, up with the rotor again and locked it down. When i attempted to start the motor up, it fired write up and sounded great. The throttle responce is nice to, but im not sure if it needs to be at 8 deg's, 10 deg's, or 12 deg's BTC. So if anybody has some tuning tips, it would be much appreciated. Please Advise :confused:

xntrik 09-24-2005 11:46 PM

From thread "383 stroker" 24 Sept 05

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re: 383 stroker

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Quote:
Originally Posted by waltnardo
I've installed a 383 stroker in my 1983 Malibu wagon. I don't know how to set the timing. The cam that I have is a comp CS X4 254H - 11 which has a .447 intake & a .462 exhaust. Can anyone tell me what I should set the timing at?



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ok You tell us nothing about your set up, only about your cam, and then somebody says 12*, so I guess you mean ignition timing not cam timing.

Nothing like guessing away 60 hp/torque. huh?

12* initial is a good starting place , considering your altitude and that we don't know anything about your set up.

centrifugal should start at 1000 rpm and come in about 24* at 3000 rpm, lower will probably be too aggressive.

vacuum should do about 12*, variable as per 60 mph cruise vacuum minus 2. recalibrate for highway load.

Cam timing should be cam company spec, dynamic cranking compression to maximum then advanced 2-4*.

Good luck, you need it.

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Last edited by xntrik : Today at 12:39 AM.

GoneNova/406 09-25-2005 05:01 AM

msd can give you some hints for their products so if you go to mallory's site they may have some too but its mostly figuring it out on your own after building a custom motor.trial and error.give it adv. til its to much then back it off.may take a wk or two.then put the light on it and record what you come up with.i built a 9.4-1 406 this spring for gas price's and today will be the first time timing it.i've got a 10.5 406 but it takes much more timing than this one.good luck

Streetmaster 09-25-2005 09:22 AM

ThanX guys for your responce's :thumbup: Yeah my motor is 9.1 on the c/r, which should allow me to use the cheap gas. My truck is'nt quite all together yet, which meens my fuel tank is'nt bolted on the frame yet. So i had some 87 octain gas, in a 2 gallon jug, and the motor didnt seem to me to make any noise at 10* btc. I realise this might take a little time to get the timing just right, i guess im just looking for a little help along the way. :thumbup:

xntrik 09-25-2005 10:30 AM

[QUOTE=Streetmaster]ThanX guys for your responce's :thumbup: Yeah my motor is 9.1 on the c/r, which should allow me to use the cheap gas.,,,,,

So i had some 87 octain gas, in a 2 gallon jug, and the motor didnt seem to me to make any noise at 10* btc.

QUOTE]

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So how can you tell without a full road test?


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