Quench & Ring Gaps Just how important?
On the dyno Friday (the first of 6 identical units), delivered Saturday, it's already in the car. A 406" SB based on a Dart block, Ross pistons, with 23 degree (235 cc-in house ported) Pro-Toplines, a Blue-Racer solid roller, Blue-Racer 1.6/1.5 Rockers, Eagle 4340 (internal) crank, 5.850 rods and a "nylon" timing gear set. Super-Victor and a 4500 Holley. 10.95 (measured) C.R. Runs fine on 93, customer will be using 100 unleaded for racing however. Made 580 HP @ 6600 and 523 Ft.Lbs. @ 5500. The main reason for posting these results is to show that the mfr's. are not always "right-on". The ring gaps
in this unit are .018" top and .013" second, with low-tension oil rails. There is no vacuum pump, nor are the Ross pistons anything special (e.g., no gas-ports, etc.), right from the box. The "quench" area is huge. P/Deck is .032" and Corteco head gaskets are .038". We have a total of 34 degrees timing for the entire test. No problems at all. Only requirement was 2.000" primaries, it wanted nothing smaller, this was the only other item (header size) we had time to test, in order to make the delivery schedule on time. Thanks, Gary in N.Y.
P.S. There are NO "fancy" parts in these units, everything from the boxes. The next ones up will recieve a bit more "flogging". 2 of the remaining 5 will see 6.000" rods. We see 600+HP (on 93) around the corner. The heads performed flawlessly. "Heads up" Rick in N.Y., These 400's will certainly be a "ride". Real nice combo!