I'm putting together a used 306 and wanted to know the tolerances for the crankshaft. Are they the same as stock (.0015 - .0025)? Should I hone a block with only 3,500 miles? If so, is there an alternative to honing oil? (Having trouble locating some) Does anybody know of a good place to find all the tolerances of a 306? It would be a great help for my biuld this week. Here's a pic of the cylinders...
Need help with 306 build specs...
- Thread starter 91lxttrim
- Start date
rd
Founding Member
For a 306, your basic 302 with an .030 in overbore, all the stock specs apply. The only difference will be the actual piston and bore dimension. The clearance dimension should be the same.
I would get a Ford, Chiltons or similar manual. The crank clearances are also the same as stock. Be careful and check the dimensions in a couple places, as my oem 79 shop manual has some odd, but critical misprints.
If you are using the crank again at standard dimensions, you should not have much problem. I checked every main and rod bearing with plastigage.
You can hone with motor oil, kerosene, diesel, or WD40.
Lighter seems to be better since it spreads and collects chips better and gets into the hone stones. Just wash the heck out of it afterwards with soap and water.
I would get a Ford, Chiltons or similar manual. The crank clearances are also the same as stock. Be careful and check the dimensions in a couple places, as my oem 79 shop manual has some odd, but critical misprints.
If you are using the crank again at standard dimensions, you should not have much problem. I checked every main and rod bearing with plastigage.
You can hone with motor oil, kerosene, diesel, or WD40.
Lighter seems to be better since it spreads and collects chips better and gets into the hone stones. Just wash the heck out of it afterwards with soap and water.
