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72 chevy blazer 383 stroker runs good until warms up
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chevy man
Novice
Feb 13, 2013, 8:03 PM
Post #1 of 10
(2060 views)
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72 chevy blazer 383 stroker runs good until warms up
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I have a 72 chevy blazer with a 383 strokerthat runs great until I drive it awhile. I have to adjust timing every time to get it to start back up. I have checked the timingchain, and all looks good. It has a msd ignition on it and im not real familiarwith them. the distributor is tight also. any help would be greatly appreciated
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nickwarner
Veteran
/ Moderator
Feb 13, 2013, 9:24 PM
Post #2 of 10
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Re: 72 chevy blazer 383 stroker runs good until warms up
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Take a sharpie marker and mark the relationship of the distributor shaft to the intake manifold. Then drive it. See if the marks correspond with the issue. I would bet you used a stock distributor hold down and it isn't doing its job like it should.
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chevy man
Novice
Feb 13, 2013, 10:01 PM
Post #3 of 10
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Re: 72 chevy blazer 383 stroker runs good until warms up
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yes it does look like the stock hold down. is there differenttypes of hold downs
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nickwarner
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Feb 14, 2013, 5:02 PM
Post #4 of 10
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Re: 72 chevy blazer 383 stroker runs good until warms up
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If its a bit flexed from age and being overtightened at one time it might not hold down as well as it should. Under running conditions it can move a little. Thats what the sharpie test is for. You mentioned an MSD unit, are you just running the CD box or are you using the MSD box, coil and distributor?
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chevy man
Novice
Feb 14, 2013, 5:21 PM
Post #5 of 10
(1985 views)
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Re: 72 chevy blazer 383 stroker runs good until warms up
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I am running the box coil and distributor.
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nickwarner
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Feb 14, 2013, 5:24 PM
Post #6 of 10
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Re: 72 chevy blazer 383 stroker runs good until warms up
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IS this a fresh build or did you do these add-ons to a used engine? If a fresh build, was the old timing set reused? How much off time is it when you have to re-adjust it?
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chevy man
Novice
Feb 14, 2013, 5:27 PM
Post #7 of 10
(1980 views)
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Re: 72 chevy blazer 383 stroker runs good until warms up
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well its was rebuilt and I dont have to turn it much at all. I bought the vehicle built this way. but if I drive the vehicle 15 miles or so and try and start it shortly after I have to adjust it but if I drive the vehicle and wait a day or so it starts and runs fine
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nickwarner
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Feb 14, 2013, 8:36 PM
Post #8 of 10
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Re: 72 chevy blazer 383 stroker runs good until warms up
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So you haven't used a timing light on this at all to set the timing exactly or to verify how much, if any, the timing is actually off? I would recommend you do so.
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chevy man
Novice
Feb 14, 2013, 9:57 PM
Post #9 of 10
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Re: 72 chevy blazer 383 stroker runs good until warms up
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sorry and would your spark plug gap cause this to or not
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re-tired
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Feb 14, 2013, 10:49 PM
Post #10 of 10
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Re: 72 chevy blazer 383 stroker runs good until warms up
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A single item alone may not cause a problem . However combined with other small items it will shut you down.Base timng ,total advance , plug temp and gap , spark voltage,mixture at idle and at speed ,valve adjustment ,even thermostat temp..A couple out of wack can drive you nuts.
LIFE'S SHORT GO FISH
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