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Mine started doing this. Just unbolted them, wire brushed the sliding surfaces, a tiny bit of silicone brake grease, and bolt back together. Problem solved.
I've see several people test various modern lifters against decades old NOS, and they're the same as far as hardness. Machining, however, a different story. A number of lifters were surfaced very poorly, wrong angles, and inconsistent surface. I used to regrind lifters just out of highschool...
What is real measuring? What is using gauge blocks, snap gauges, feeler gauges, or a machinist scale? I measured the red gauge, which fits perfectly between the piston and cylinder head surface. It's not measuring the open step. You can see the head gasket surface. TDC was verified with a piston...
I was estimating about 15,000 miles on the cam. I have a stroker motor for the car, but wanted to put this motor in my Dart. I found the original cam and I numbered lifters, so for the price of a couple gaskets, I'm going to take a shot at putting it back in. I tell you, although I'd rather...
I found the lifters that were in the motor, and I numbered them, so while I wasn't excited to try breaking in another flat tappet cam, or dumping money into a turd with a roller cam, I'm happy to put the original cam back in and get it running while I'm putting the other motor together.
Combustion chamber shape plays a big part. Everyone should have heard of quench by now. Another very important factor is the intake closing event, which determines how much air gets trapped for the compression stroke. People are running compression ratios which would sound insane to street...
The Parkerizing is worn all the way across on the flanks, and most of the base circle on that cylinder, far left. The flat lobe is third from the left.
Here's another lifter. It's starting to concave, but still looks like the others visually. Smooth with similar wear pattern, but the others are still convex.
More like 7.28:1. Got a better measurement of my deck clearance, .140". That's the thickness of the red gauge I used, and 88cc estimate for the 906 heads.
"The pistons are .155" in the hole, which means, that's 7.5:1 so after I put the heads on with the composition gasket instead of the factory steel shim, 7.4, so what's a tenth of a point between friends right?
The Mopar had 50ft-lbs more torque below 400rpm, then matched it on up. Grew up hearing longer crank makes more torque, but this is the opposite, and giving up nothing for HP. I see head porters and engine builders feel sorry for us that the "good" aftermarket Mopar heads flow well for small...