Engine block with red circle around a part, viewed from the front

If you look Into the valley of this motor youll see it has a Rev Kit installed - roller lifters. Many rev kits simply dont work and add nothing to the RPM - - of the valve train, but they do cost money. I recommend their use only system can be component matched by spin testing and selecting pushrods, etc., based on the results. When finely tuned, the rev kit comes own, but its a high-dollar rather than a budget racers deal. rounder nose on a cam gives up a little cam lift for a given duration and negative acceleration. On the posi- tive side, such cam profiles can tol- erate a higher ratio rocker better as the cam nose/lifter surface stresses are lower for a given ratio. in addition to profile selection, cam life also is greatly influenced by the break-in procedure. Use of the recommended cam lube is a must. Also, the lobe nose, which is the point of maximum wear, experiences the highest loads at idle. The first few minutes of running are the most critical aspect of breaking in a new cam, be it street or race. Dont let the motor run below 2,000 RPM for the first 20 minutes. Never idle a flat-tappet race cam at low RPM, even if your setup allows it. Another way to extend cam life is to ion nitride it. Ive had excellent results with this process and though its about $120 a cam, its worth it. Going this route allows as much as 40 pounds more over the nose with- out sacrificing life. This means 260 pounds over the nose, even on a more aggressive profile, will last indefinitely in a street motor. For the racer who invests in a quality cam, its good insurance that the cam will last longer than it needs to, saving the cost of a replacement. Weve looked at nose loads, now lets get back to preventing power- robbing seat bounce. Seat bounce is caused by too high a valve-closing 104 velocity. The best way to de ,7 is to set the valve on the gently as possible. in this hydraulic cams can be o: solids, but its not an ope deal. That well get later. list are tight lash cams , .020-in. lash clearance. often, but not always, b-- ' of seat poundage req vent seat bounce. Last . lar lash cams, having on up. Selecting valve sp _ an easy job. Having I ment on hand, i j springs for most bu by looking at what, and produced in= brings the price to _ investigate the spring in questio in the discovery ' springs for m. are cost effec' terms of mass,: the engine to ,. with some to , best, theyre r; I passed -:_, area to Motor they were . . their valve .' $20 a set mance. I the sprinn-sz get-orient 7 instance, 7 MM&S .. : Budget Building Chevy Small Blocks