Hey Bill, I did weigh all the pistons that were removed and the new ones I went ahead and installed. All the new ones were within 0.23 grams of each other. The old set had a little more spread to them by 0.67 gm. The difference between the old set and the new set per each piston was greatest at 10.6 grams and least and 9.9 grams. I found some articles that stated no more than grams and another said 30 grams depending on the level of performance.
I believe the camshaft that Reher & Morrison custom made for my application calls for 8100 RPM shift points. The Erson grind has .800"/.737" (I/E) and a healthy 050 duration of 292/299 and the LCA of 113 degrees. With that LCA it has a lot of top end. So far it has been the best cam profile I have tried with alcohol injection with a broad torque curve.
No the cam wasn't falling in it's face. When the engine was fresh it zoomed to 8100 and still seemed to want more, but I remained sane enough to stay away from higher revs. But after 3 hone jobs from 1998 to 2004, and still using the same pistons with new ring sets, the piston to cylinder wall clearance was so big that the pistons were wobbling at the top of the stroke, enough that the edges opposite of the pin were contacting the heads. All the pistons were making contact. This is what was making the engine seem to fall on its face around 7000 RPM.
I am expecting it to be much better sailing from here all the way to 8100 again. Plus I made some oiling system improvements by get a competition full sump full kick out oil pan fitted with all sorts of windage reducing devices. Compared to the street pan it had without a windage tray, I am expecting 20+ HP to be freed up above 7000 RPM, and most of the oil should not get whipped up in the crank circulation. Not to mention it's now a 552 CID engine, and a little more compression since the bore is a little larger in diameter.
It will be interesting none the less. At the height of the engine life, it made just at 1000 HP. Hoping to see 1075 max HP with all the extras.
Thanks for the reply Bill. Good luck to you this season. Regards, Brian.
1969 Z/28 Camaro
540 Injected Enderle Bird
Lake Jackson, TX