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Old 04-26-2003, 08:10 PM
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Post Missing 390GT, What it is?

I've got a 67'Fairlane GTA 390 with 428scj heads,10:1 flattops and 1,000,000++mi.on the odo. It has developed a miss that I have not found yet. Its not Ignition or carb. just rebuilt both. It's not ticking like a bent pushrod. I'm thinking burnt valve, but I have not checked compression yet. Does it sound like I'm on the right track? :o

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Old 04-26-2003, 08:42 PM
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If it doesn't have an adjustable valvetrain, it is highly likely. I'd do a cylinder drop check and isolate the cylinder,then do a leakdown. I would spray around all vacuum fitting,etc. with some flammable contact cleaner to verify that it doesn't have a leak in the intake somewhere (if it does and is left long enough it could fry a valve). The non adjustable valvetrain is often left unchecked and can let the valves not fully seat causing burned valves. I've seen it on many FE's (390's,390GT's and the 428CJ's and is propably as common on the others) when valve jobs are done or the head resurfaced and reassembled with out doing a lifter collapse check for clearance. It usually is an exhaust valve.

[ April 26, 2003: Message edited by: woodz428 ]</p>
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Old 04-27-2003, 06:12 PM
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Thanks for the info dude, losta help. I thought I might be on the right track but wasn't sure. The car is kinda mothballed right but I got a 15 year old son itchin to get his hands on it, or rather foot in it. FE performance parts like adjustable valvetrains are gettin kinda hard to find but I'm looking. Its over due for a good goin-thru anyway. Thanks agian.
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Old 04-27-2003, 06:16 PM
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jegs carries the adjustable ductile iron rockers, and harland sharp also makes some adjustable roller rockers $$$$$$. there is an outfit on ebay selling fe roller valve train stuff. don't know how good it is though..........
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Old 04-28-2003, 07:28 PM
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Thanks for your help Crazy Larry, I've been looking (not too hard) for a set of adjustable rockers off and on for awhile. I'll check out Jegs!
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Old 04-28-2003, 07:47 PM
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anytime. have you pegged that miss yet?
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Old 04-29-2003, 06:31 PM
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No Larry, ain't had time to fool with it yet, too much work too little time. It's on the list though! <img src="graemlins/pain.gif" border="0" alt="[pain]" />
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