Bearings sizes, STD or larger?

[Cody Morris]

For bearings replacement (rod and main), what does a bigger size offer you for the car?

 

[NosLaser]

The only reason why you use larger bearings is if the crank has been cut. If the crank is cut .010" under, then you will need .010" oversized bearings to fill the gap. There is no inherit performance gain with larger bearings.

Regards,

 

[kylemoto]

In the old days, if you wanted to make power, the adage was "tight on top and loose on the bottom".

What this meant was: blueprint the engine, making cleaances tighter on the top - pistons, rings, valves, valve guides, etc. Conversy, you would make th bottom end "loose" - extra clearances for the bearings, rods, etc.

Of course, be very aware - reliability went out the window! As an example, back in the 60s, several car makers wnated to show their cars were the best, so they had the engines set up like described above. They lasted about 20 miles of testing!

So, conclusion: follow the factory manual - I'm sure they did lots of testing to prove things out!

Kyle