Ok well Im about to reassemble my partially rebuilt engine. By partially I mean new coolant seals and water jacket, and another center housing. How long of a break-in would you suggest since I am using 90% of the same parts, or should I just baby it till the compression gets to a certain level?

 

I beleive that the break in is to make the apex and all other cumbustion chamber seals SEAT correctly in the housings by wearing into the grouves or shap of theier mating surfaces. So I would say just take it easy for a month or so and then let her rip.

That is just my observation though.

Santiago

 

well if you just replacing the coolent seals, I'd give them atleast 300 miles to seat properly, and definalty check to see if you need new needle bearing and spacers...

 

Anybody else have any input?