Today is the first day of the week-long Crusin the Coast, the ONE vacation my wife and I take in the year. The 421 TriPower in her 65 Royal Bobcat GTO had to be rebuilt due to a failed big end bearing in the #3 connecting rod. Fortunately I caught it before it spun or caused other damage. This motor had been built out by a previous owner years ago. It is now .035 over, has RaceTech dished forged aluminum pistons (10:1 CR...from a previous 10.9:1), replacement ArmaSteel cast crank, 65 8777 ported iron heads, RollMaster billet steel double roller timing set, Comp Cams Xtreme Energy hydraulic roller cam and lifters (278/284 .505 lift), double springs w/damper spring, 10° locks, retainers, steel roller tip rocker arms, valve lash caps, Eagle H-beam rods, and ARP everything everywhere including ARP 4 bolt main cap studs with a Milodon oil pump and Pertronix Ignitor III billet distributor. I am going to set the rev limiter at 5,900 RPM based on cam profile (5,600 top range) and the formula for Feet Per Minute based on stroke x rpm ÷ 6. For a "street" motor it is suggested that 4,000 FPM be the limit, and given the quality of parts in her 421 I am confident that I am on the conservative side. 3,933 FPM is the number at 5,900 for the stock 4" stroke that it has. Opinions on the RPM limit I am suggesting?