so over the last 7 years I have lapped roughly around 1000 engines that were used in competition...I have as well done roughly another 2000 that were not lapped and used in competition..... ultimately the lapped engines do need to be re-pinched faster if you count all the gallons the engines had run, but if we counted the gallons of peak performance the lapped engines give a longer lifespan..... its true a tighter sleeve lasts longer, but its also true it takes upwards of 2 gallons for a quality engine to drop its nuts and reach peak performance...by contrast the fitted engine is at peak performance right out of the gate and is safe to use in competition with no risk of piston damage, something we have issues with in a tight sleeve.......

now next time I have a bad piston I will take pictures to show the high spots some of these can have, and why I prefer to lap the engines before breakin..its not all about saving time, there are substantial performance and durability gains to to be made by doing this...a properly lapped piston is far less prone to scuffing then is a non lapped piston.... and this scuffing can be a real issue on some of these faster accelerating competition engines

As I say I have worked on thousands of competition engines over the years, by dyno tests they are the most powerful land nitro's on the planet, they are used in all levels of competition from professional to novice...they have been used to win National, provincial, Regional and State championships....set records in oval, drag and top speed as well as pulling so at the end of the day the proof is in the pudding !