:iagree: on all counts!
Signguy:
I help a local circle track engine builder, chassis construction shop. We build some 40 or 50 355ci sbc non-roller motors/year ... & a few street performance non-roller motors. With rare exception, they ALL get the typical breakin suggested by cam makers ... even with new lifters on used cam. Our breakin is done on an engine dyno under no load (same as in engine bay in neutral). After breakin, things are checked & adjusted as needed ... then the dyno is loaded and we go for several full-throttle pulls. We've NEVER had a cam or lifter failure ... not on dyno nor on track. Ability to reuse cams gives some indication our breakin procedure is valid. As well as for the love of racing, we do this for MONEY too... and try not to waste too much time with things that aren't required. We consider breakin @ varied 1500-3000 for 10-15 min w/ no load a REQUIREMENT ... after breakin the motors're shown no mercy. Those non-roller motors typically make 370 hp with iron chevy heads, a performer 2101 topped by a TWO-barrel carb and are intended to turn about 6.8-7K rpm. The ONLY exceptions to our breakin procedure are those few customers who choose to take delivery without breakin ... I dunno how or what they do later ... but I'd bet they follow typical breakin procedures too. BTW, we build a few OHC 2.3L Fords for mini-stocks too ... they get same breakin ... also no history of cam or follower failures. If a motor is assembled correctly, cam makers' breakin will not hurt it ... and can only help. If it ain't assembled correctly, and you don't employ cam makers' breakin ... you'll find out ... maybe somewhat later. Heck, we just put a new hydraulic flat tappet cam & lifters in a Suburban race car hauler ... a mild cam w/ low lift & duration ... ground for torque & towing ... and we broke it in right in the engine bay ... just as cam makers suggest. G'Luck & Happy Holidays