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Old 04-26-2013, 08:01 AM
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Crap.....broke it last night.......

Well, had the Coupe out running around the area last night (355, 9:1, intake/headers, .480 cam). Was being sniffed by a newer Mustang coming up to a light. Two guys looking hard at the Coupe....I decided to make a go of it and kicked it coming off the signal. Pulled it up to about 6000 and right before i shifted second, i heard a pop-pop like a miss, shifted second and felt it shuddering. Pulled over, and its making a sharp ticking noise, sounds like in the valve cover area, hard to tell.....I was only about a mile from my place, so i limped it slowly home with it making a racket . I think a valve spring let go, not sure. Will break into it today and see whats up.
I had just locked out the distributor as one on this forum suggests to everyone, had it set at 35 total locked out. Got rid of the Edelbrock for a 650 DP and had tuned it over the last week. So, embarressed and pissed, but crap happens....will post pics as i get into the motor to see what happened....oh by the way, the Mustang didnt have a chance, but got the last laugh dammit.....

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Old 04-27-2013, 06:37 AM
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I hate when that happens, hopefully you broke a rocker, and nothing worse
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Old 04-27-2013, 07:34 AM
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If it has pressed in rocker studs, it may have pulled one.
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Old 04-27-2013, 11:31 AM
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I had "the better half " duties crop up so i didnt get to open it up yet.....Im hoping I wasnt hearing a piston hitting, but it sounded more like something in the head....hopefully i will get some time this evening to tear into it some. These heads are just some small chamber stock heads with some minor port matching, so yeah they got press in studs......
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Old 04-29-2013, 08:36 AM
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I bet you broke a rocker stud.
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Old 04-29-2013, 09:45 AM
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6k on press in studs can easily pull one up enough to let the lifter clatter. It can also let coolant into the engine. Check the dipstick.

I have NO IDEA why anyone would lock a dizzy at 35° on a street engine. Especially a mild build. That is for WOT only racing. You WANT a dizzy to change timing for different loads and rpms on a street engine.
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Old 04-29-2013, 12:39 PM
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Street racing hurts.....
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Old 04-30-2013, 11:29 AM
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And the winner is: 38Sedan !! It was two rocker studs broken on hole 5. All the parts laying on the head, not valve spring probs or retainer issues. Dont know why, I guess my beating on it put more rpm hits than the stock studs could handle and flexed till failure. Broke right at the bottom of the rocker adjustment nut. Kicked both lifters out, that explains the oil pressure going from 50 to 20 on the limp home. So no catastrophic failure but cant fix it in the car. Both pushrods still in the head, with the opposite ends laying in the valley, so luckily they didnt get into the cam area and chew things up. So, I guess i will move the high HP mods up, and pull the motor for tear down and machining....and build the big motor.
As far as the locked out timing, i was trying it from advice from F-Bird here on the forum. Was using a cut out switch to ease hot starts, and it was running fine, actually ran the best it ever has.....so its not an issue. The car is light, with enough gear, and its a hot rod, i dont give a crap about fuel mileage or any of that. I want top performance. I think with the tune and carb changes, it finally made enough hp to push the limits on the head (441 castings, mild port). Got a few pics of the carnage.....
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Old 04-30-2013, 02:55 PM
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ouch thats only the second time ive seen rocker studs break, the first time was on my friends engine in which he was getting coil bind on the springs which caused the studs to break.

normally i see the studs get pulled before they break
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Old 04-30-2013, 03:05 PM
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Yeah, first thing i thougt was coil bind on the springs, but they were checked along with the retainer clearance several times, and I checked again today and all is good. Not sure why, but damm sure did!! I realized today that the studs are pinned, so thats why nothing pulled out.....I suppose machining or welding a bolt on for a puller is about the only way to get these out.....im fixin to install AFR's anyway, was just gathering parts while fooling around with different stuff on this motor. Found the weakness apparently, lol.
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Old 04-30-2013, 06:04 PM
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The issue with 35° on a street engine is part throttle, especially under 2,500rpm. It creates detonation, which can destroy pistons. Aluminum heads will help reduce that but it's still not ideal for street performance. You can still curve the dizzy for max advance and performance over 2500-3000 rpm. Has nothing to do with mileage, just trying to save your engine.
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Old 04-30-2013, 06:18 PM
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Going to be fun getting the pins out so you can pull the studs! The studs will be easier than the pins, unless they left some pin sticking out to grab. You can weld something on the stud, or you can run a die down them and thread them to attach a nut for pulling.
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Old 05-01-2013, 06:35 AM
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yeah, I will prob try the die/thread deal first once they are on the bench.....if no go....then out comes the TIG torch..
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Old 05-01-2013, 07:34 PM
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Are you runnin 1.6 rockers ,if so may have to change to long slot rockers ,I have a couple sets of heads with pinned stds ,I can push the roll pin out the other side ,
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Old 05-02-2013, 08:37 AM
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Yes, looks like I can remove the roll pin after removal of the head. But can you get pinned studs anymore? Prob just upgrade the heads with screw in studs anyway.....Ive gathered up parts for a hi horse build on this block with AFR heads, so these will sit for awhile. I admit that I didnt check for full lift clearance on the rockers, as I have run stock rockers with .450 lift cams before (factory hi-po cams) without issues.....I think they binded against the stud till it broke at high rpm pull
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