Good enough shape to reuse. Rolled em on a sheet of glass, all 16 were fine to use, no wobbles or bends in any of em. Cleaned them up before installation. The cam I have, at least according to TA Performance, is the rowdiest I am allowed to go with the stock rocker and pushrod setup.
y'know, it might have just been my choke. I swapped air horns from another qjet I had (same model number, don't scream) and readjusted the choke, and it idles and runs better. The motor shaking would be dampened a bit I assume by not having V6 motor mounts, even though they're new. The old air horn had a chunk missing out of the choke tower so it was getting extra air all the time, causing it to go lean(er).. I guess. I'll see how it drive's the rest of the week, and still might pull the VCs off just to check up on those nylon buttons. DO I need to get new gaskets when I take the vcs off? They're cork, and they are already compressed from being on. I installed them dry, and they don't leak as of now. I won't have the scratch to pay for new VC gaskets anytime soon.
That's a fairly mild performance grind. It should have some lope but its not a ton of overlap. If you are feeling the miss at part throttle cruise my guess is its a spark or fuel delivery issue. A bad lobe would cause a dead miss I would think.
What do the plugs look like? If you are going to pull the valve covers can you run the engine without them to visually observe the rockers without spewing oil everywhere? If a lobe is bad enough to cause misfire it seems like you should be able to see it.
going back to your first post why do you say you have a miss and then make the grand canyon leap to having lobes ground off the cam?. Like someone suggested it could be as simple as a vacuum leak. Why not check the easy stuff first unless you feel without drama life aint worth living
I've seen guys wipe lobes out fairly quickly when not running good oil with a flat tappet, usually you can hear the valve train "ticking" pretty good if a lobe goes flat. It sounds to me like it is more
fuel delivery or vacuum related.
Yeah, there is no tapping that I can hear. When I first build the engine, it just faintly started a taptaptaptaptap after driving it around the block, then I shut it off and didn't even start it until I fixed the no oil pressure issue. There was still break in lube (I used the moly paste stuff) all over the valvetrain and cam, so I think that saved my *ss. Hasn't had a tap since. The exhaust manifolds though, man, whoa. Like a dry lakebed. Surprised they just started leaking. And as soon as the motor shuts off, there is a loud TICK TICK TICK TICK TICK. Is it the manifold contracting back into shape? Those will get fixed soon enough though. Cast iron... heat it up first then fill in the cracks with nickle rod right? The only vacuum leaks that I think would be on the motor would be in the primary throttle shaft bores in the baseplate but I've emptied almost a whole can of carb cleaner on various points on the carb and engine and I've never seen or heard the rpms drop. All the plugs look damn near new, and all the wires don't have any weird spots and all of them checked good with a meter. It may be the carbon brush thing under the coil, but could it cause such a fuss? I dicked up mine and replaced it with one from a random HEI I had. It was in decent enough shape, better than the one that was in there.
Fuel system seems fine to me as well. Seems to get good fuel pressure at all RPM, accel. pump works, two nice streams of fuel into the primaries. The carb is all new rebuilt from Everyday Performance (I fixed that this morning actually, the one I dicked up by dropping it), and it runs really well other than the miss. It happens most at idle when the engine is cold, and almost goes away as it warms up. Almost non existent at speed, but when at a stop in gear bubbububububububbbbbbububububbbbbubububbbbububbbb and the motor shakes something fierce. Tomorrow I'll try and get a video of the motor running and doing the Harlem Shake.
I've seen guys wipe lobes out fairly quickly when not running good oil with a flat tappet, usually you can here the valve train "ticking" pretty good if a lobe goes flat. It sounds to me like it is more
fuel delivery or vacuum related.
the cam's base circle may not be wiped at all, so ticking noise may not be present. if no access to IR heat checker, your next best bet is as simple as a "t'd" vacuum line to a vacuum gauge. uneven breathing through the intake tract will show its ugly head that way. i can't make a face like your sound description, but if the vacuum gauge needle bounces at roughly the same intervals as your popping noises, you'll know then for sure if valvetrain is the culprit. fuel, air and spark recipe hasn't changed in a long time. bouncing needle is the result of several conditions. an improperly set valve may be the easiest cure... don't throw the baby out with the bath water! check easy things first. good luck.
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