Got head gasket job done and truck started but it runs like poop! - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-01-2004, 01:00 AM
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Got head gasket job done and truck started but it runs like poop!

i put everything back together on my chevy 307. I'm sure it's either the exhaust rocker arms or the timing, i had some trouble with the rocker arms, they kept coming loose after i adjusted them, why is this?, then i'll tighten them back up and adjust them, and its sounds good at first but then after a while i got some nice backfire, i don't have a timing light at my house so i had to do it by ear (i have auto shop at my school, and we have a timing light.) It's shooting flames from the one side i had troubles with, i'm sure it's the rocker arms is there something i'm not doing right??? i did like the people said on here. oh yeah the other side did it once too, but it stayed after i re did them once. should i just keep doing it till it stays or what?? should i time it first, then adjust the valves. It also knocks a little when i give it some gas and it's toward higher RPM's, i think this is the timing, maybe the valves please help me out here!!!

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Old 03-01-2004, 01:59 AM
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it sounds as if the rocker arm lock nuts are backing off once the engine runs for short time and gets hot. this is common on older small blocks, I would suggest going to the junk yard and getting a set of lock nuts off a newer small block, new as you can find. I had this problem years ago, after I would adjust the rocker, I would watch the nut back off as the rocker moved. we also had this same problem when we bought a set of cheap summit rocker arms that came with lock nuts, they backed off as soon as the engine got hot. most parts stores won`t carry the lock nuts seperate, they only come with a replacement rocker arm.
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Old 03-01-2004, 06:22 AM
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Classic symptoms of a failing cam. Tell us about the break in you did.

Chris
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Old 03-01-2004, 08:03 AM
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Should be able to buy new nuts about anywhere. Try your chevy dealer. Or try a jam nut. Time it before and check it after.

Troy
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Old 03-01-2004, 09:07 AM
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Studs

You may want to lay a straight edge across the rocker studs, if they are pressed in. Higher lift cam can lift pressed studs sometime. They may be uneven indicating movement and requireing readjustment.
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Old 03-01-2004, 10:05 AM
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yo yo yo dis is the funkmasta you must tear out that raggedy old 307 and drop in a ho treefiddy
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Old 03-01-2004, 04:11 PM
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treefiddy what? Dat a Ols or Chebby or what? I like the treefiddyfi sbc best!! Wa yu think dude/fmf?


Tazz
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Old 03-01-2004, 06:17 PM
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nevermind i wasn't adjusting the rocker arms correctly. i got it running a lot better but it is still pretty sluggish, the point underneath the distrbuter cap is shot though, could this be a problem with it running like poop?? nah it's got enough power, i can beat a lot of people, it better not be the cam i just replaced it with a racing cam.
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Old 03-01-2004, 06:30 PM
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61CheyTruck,

Glad to hear you got it running better. We hope it isn't your cam too but sometimes people will let their engine sit and idle for a long period of time when they should be keeping the RPM's up to around 2 grand so oil can be slung all around in the engine.
I think most cam companies have their own break-in steps and you need to follow them "to the letter" or the cam might go flat and then the company say "So sorry, you didn't do as we told you to do." And they will not replace the cam.
Keep twisting the wrenches, and Have Fun.
Scholman
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Old 03-01-2004, 09:09 PM
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yeah i obviously still have some tuning cuz it's still backfiring pretty good, it has died on me about 2-3 times when i come to a stop, nothin too bad, it seems to lack power in the higher rpm range, doesn't have the power it did before the head gasket blew, but hopefully it's gonna get better with some fine tuning.
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Old 03-01-2004, 09:33 PM
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Backfiring out the carb, or pipes?
What kind of carb are you using?
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Old 03-01-2004, 11:48 PM
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backfiring out of the pipes, it's a edlebrock 4 barrel
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Old 03-02-2004, 01:17 AM
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Exhaust valve to tight or timeing way off.

Troy
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Old 03-02-2004, 06:39 PM
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Yea I would bet money it's the valves too tight.

If the timing is retarded it will backfire out the carb.
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Old 03-03-2004, 08:24 PM
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i fixed everything and it runs like a beast now, better than before!!
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