Do a compression and leak down test before you do anything to see whats causing the plugs to oil foul. RICK
The 186 heads I believe come either way with 1.94 or 2.02 intake valves. They are a descent head, but old school now. They say the vortecs will outperform them also. The plus side to them is they have the accessory bolt holes in the 186's. Usually an old set of heads need a lot of money invested in them to bring them back.I finally got tired of the 350 in my Nova leaking oil from the rear main and using a quart every 200 miles. Started last night (Sunday) and finished this evening pulling it out. All the plugs are oiled up really bad, but #2 was the worst. I don't see how some even fired. The plugs only had about 1300 miles on them since I put them in new.
Tomorrow night I'll do the tear down on the engine and see just what is going on. It has to be mostly bad rings, but there were signs that the valve guides were sucking oil too.
Supposedly the engine was bored 30 over and a new Comp cam put in about 2000 miles before I got it, I have the bills from the NAPA dealer that PO had do the work, but there is no marking on the right front of the block deck where they usually stamp the block if it's been bored. It does have the 9 digit VIN number stamped there, as does the Muncie transmission, so it is a numbers matching car. The other code stamped there is V0402CNJ and the casting number is 3970010.
One question is how good are the 3927186 double hump heads. According one site they are 2.02/1.60 heads, but are they worth bringing them back up to snuff, or should I get a set of aftermarket heads? I'm going to put in a Comp Nostalgia Series cam that is a hydraulic version of the 327/350 30/30 cam. It does have a set of Comp steel roller tip rocker arms.
I will post some pictures as soon as I have time to set up an account on PhotoBucket of some similar site to post them.
That's what I am planning on doing, that is have the 186's redone, and keep them even if I put different heads on.To me, it depends what your intentions are for the car. If you want to keep it as a matching numbers resto, then have the 186's redone. They're good heads, even with 1.94" valves. Another option is to put a set of Vortec's on it. They'll probably perform a bit better. But if you do that, then keep all of the original parts to pass along with the car when and if it comes time to sell it.
I had checked the compression a while back, soon after I got it and it was really good and all the cylinders were within 10 psi. I would have done a leakdown test but my tester is out at my airport hangar, and I didn't feel like a 20 mile drive to get it.Do a compression and leak down test before you do anything to see whats causing the plugs to oil foul. RICK
When it comes back from the machine shop do the bolt holes again :yes:Got the engine torn completely apart last night. I even managed to get the water drain plug out, although who ever put it in tightened it way to tight. Had to drill it out really thin and then heat it up red hot with the torch, let it cool off, and take it out with an easy out. The oil rings look okay and fit the bores properly, but don't have much tension on them. I'm not sure what is going on with them. I am working on chasing out all the threaded holes for the head bolts, oil pan, main bearing caps and front cover with taps so everything goes back together easily. All the bearings looked good also, hardly any wear on them, but you can't use them over so I'll get new ones. Them cam looks really good, so someone could install it with new lifters and it would run a long time. It is a Crane H-260-2 cam, a replacement for the stock cam, was only good for 1500 - 5000 RPM, but has good low end torque.
Tonight I want to finish chasing out the bolt holes, and then give the bores a quick hone job to break the glaze for the new rings. Then it will be ready to take to the shop to be hot tanked so it is nice and clean to put back together. I'm going to try to order the rings, bearings and a few other parts from Summit today so I will have everything I need to put it back together.
Anyone have any suggestions for rings? I see cast iron, ductile iron, moly and plasma coated rings, so there are lots of choices. This is just a street engine, maybe a trip to the track a couples of times.
I will chase out all the holes again when I get it back.When it comes back from the machine shop do the bolt holes again :yes:
I drilled the new holes as per the diagram and the head gasket.If you are using a peformance gasket you may want to look over this link as most performance gaskets require this hole for proper cooling.
Thanks.The engine looks great, really clean!
IMO I'd change out that Fram oil filter for something else (AC Delco, Wix, Purolator, etc). I noticed my car had lower oil psi with one and several others have had issues in the past as well. I switched to Wix and have had good luck with their filters.
I like those valve covers too! Looks good!