72steve said:
i have a 350 .030 bore
10/10 crank polished
forged flat top pistons
cam 465/480
1.5 aluminum roller rockers
edlebrock rpm heads
edlebrock rpm intake
edelbrock 1407 electric carb
50,000 hei
is this enough info?
sorry didn't know what you were asking :embarrass
thanks for clarifying it for me :thumbup:
This will work for early computer cars. Yours won't have the TPS issue.
Basically same procedure for your engine just no computer.
Warm up engine to regular operating temp, and ensure idle speed stays below 1000 rpm.
Run engine at 2000 rpm for 2 minutes under no-load [in neutral, no accessories on]. Race engine 2 or 3 times under no-load, then run engine at idle speed. [this heats up the oxygen sensor so it is working]
Turn off engine and disconnect throttle position sensor (TPS) harness connector. [It's on the side of the throttle body facing the firewall - driver side of the engine, down low and past the brake master-cylinder]
Start engine. Race engine (2 - 3000 rpm) under no-load, the run at idle speed. [You may have trouble keeping it running with the throttle sensor disconnected. Depending on where your timing is set, it may stall. If so have someone sit in the car and press the gas *very slightly* to keep it running. Don't rev it up or you will not get an accurate timing reading/adjustment. Keep it at idle speed, about 800 rpm]
Check ignition timing with a timing light. It should be 15 degrees plus or minus 2 degrees Before Top Dead Center. [The timing mark at the extreme left (counter-clockwise) is zero degrees. There are lines at 5, 10 and 20 degrees to the right of it. There is a wide paint mark from 13 to 15 degrees, which the factory probably set yours to. Eyeball 17 degrees between the marks and that's what you want.]
From the 1991 Technical Bulletins, Beginning with April 1991 production,
the ignition timing mating mark has been changed as shown below.
NEW marks at -5,0,5,10,13,white paint,15,20 B.T.D.C..
OLD marks at 0,5,10,15,20 B.T.D.C..
[Editoral note: there has been a lot of dicussion about the timing marks and basically it comes down to the easiest way to find the 15 degree mark after the early '91 production is to look for the white paint or the two marks that appear very close to each other. ]
-5 0 5 10 1315 20
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^
17
If not, slightly loosen two bolts holding the distributor, and twist it [toward the front of the engine to advance, toward the cabin to retard] to obtain the desired timing. [Recheck the setting after tightening the bolts!].
Shut off engine and reconnect throttle sensor.