Well heres my previous post on my issue http://web.camaross.com/forums/showthread.php?t=480896

and heres the results are these reading normal for a 383 cam specs 23X 23X 10X LSA?? thanks for the time for helping me out

 

I don't know if the pressure is normal, it very well could be, but it's always a good sign when they are all that close together. And the plugs look good, seems that it is a good running engine.

Wait... I just noticed something. Your bottom row is not in order compared to the top row (and your diagram), I bet it's gonna blow up now. j/k.

 

that #8 plug looks a little bit um... black. but maybe its just the angle its taken at.

 

lol nice to hear that im glad to know that the rings were seated properly the motor has about 2500 miles on it im also curious what you guys run plug wise on your 383's and what you gap them at for a N/A motor thanks for the input SS

 

hmm actually now that i look at it, it is black but i think i know why its like that when i was looking at my spark plug wires and inside that particular wire (the boot) the metal terminal that goes onto the tip of the plug somehow sunk deep into the barely making contact with the plug could that have caused it?

 

That plug may have been suspect to misfire. Could have caused a power loss... who knows. I'd suggest getting the plugs in there right with good connections, take it to the track and find out if there really is a reason for you to wonder if you're down on power. Especially since automatic car dyno numbers can be so inconsistent. It's also quite possible your converter isn't doing its job.

 

#6 looks fouled as well, but once again, it could be the angle. 240 psi sounds high. Is that just because you're running a 3.75" stroke?

 

6 and 8 are both a lil dark looking (as mentioned, could be angle of pic).

Man, 1 bad plug wire can cause HELL.

Check L-R O2's and L-R BLM's and compare.

I was about ready to put a carb and dist. in my car and eliminate all of this carp but after installing a new set of plug wires and a mail order tune from PCMforless, the car just woke up.

I got some $40 7 MM plug wires from Oreilleys since the 8 MM and larger wires would not fit in stock wire looms (behind A/C and belt tensioner) with out being forced in. I just installed the new 7 MM wires with no looms and installed a new tune. BLM's and O2's were equal after that and the car ran MUCH better.

 

I think most of the darkness is the angle of the pic. Those plugs don't look bad at all. Even if the 6 & 8 plugs where a little dark, that is not going to cause a missfire. It could be those 2 injectors are putting out a little more fuel than the others. Remember to put a dab of dielectric grease on the tips of the pugs (and a light skim coat on the porcelin). This will help with the boots going on an comming off, also it will help keep good contact between the wire and the plug. Use a DVOM and check your wires to see if you have any breaks or other problems, if you want to make sure you checked everything.

 

A dark plug #8 is usually a sign of intake manifold leak (again, unless it's the angle in a picture).

 

Those are all dead nuts the same so no problems there.....

 

i looked at plug number 6 and it was deff the angle in the picture, plug number 8 i know that was deff was missfiring due to that plug wire its just a big relief that the compression is where it needs to be... so im going to install new plugs and fix that plug wire issue and see how it runs hopefully that fixes my problem any other test i can run to see whats going on ? but again thanks for the tips and for chiming in

 

You could do a leak down test. This will help identify any problems with the rings, head gaskets, cracks in the castings or valve seats. Chances are it's ok, but if you want some thing to do it's not a bad thing. A dead cylinder will short you some power. Good job finding the problem, now fix it and make some pulls or passes.

 

If he's getting compression numbers like that he probably doesn't have a issue with leakdown.

Bret

 

hey bret i may be stupid for asking this but would a vacuum leak or bad valve adjustment show on a compression test and on installing the plugs again what should they be gapped at for a 383? thanks