2 motor questions

[951 Blackplanet]

#1 will align honing affect main bearing clearance,or is just to make sure that the crank runs straight and true?#2 what is the max a std bore can measure before it needs to be bored?im ready to start my rebuild and really dont want to have to rebore if its not necasarry.also does trw make a forged piston in a std bore.......thanks

 

[bison]

#1 will align honing affect main bearing clearance,or is just to make sure that the crank runs straight and true?#2 what is the max a std bore can measure before it needs to be bored?im ready to start my rebuild and really dont want to have to rebore if its not necasarry.also does trw make a forged piston in a std bore.......thanks

#1 yes it will if the caps are not shortened. Anytime you remove metal from the bore the clearance will increase. The machine shop should be able to take a little of the ends of the caps to keep the clearance in spec. If they dont know how to do this find a new shop.
#2 If you run TRW's you can go .004-.005 on the clearance but it may make a little noise till they warm up.
#3 TRW has a std. replacement forging. Not sure on the part number though.

 

[951 Blackplanet]

im trying to stay with the stock pistons and bore what is the maximum bore size,and what is the minimum piston diameter,all std parts?thanks

 

[boostingbuick]

You need to measure all of the pistons and walls per bore. They make long feeler gauges to make a garage reading. If you start going over a loose .004 or .005 its time to get it bored.

 

[Lee Thompson]

TRW pistons

My one experience with stock bore TRW forged pistons 2 years ago was that they are a little BIG. I had a stock bore block that had.0015 wear. Honed the block slightly to get the recommended TRW clearance. Engine is very quite.

On honing the mains--there is a high and low limit (bore size) IMO, I would keep it on the tight side.