In general terms, the price for Inline rebuilds look something like this....
R&R.... $600.00
Assembly and Run-in.. $700.00
Parts... Whatever you want to add/repair/no used except your own from the motor that's R&R'd
This is a general guide for machining... Boring/honing, Valve Job, Head and Deck resurfacing, crank polishing, flywheel's extra
For High performance engines add $300-$500 more.
This price is contingent on the condition of your parts.
