well i hear from some ppl we cant change the main cap is that true? even in same engine? idont know if there a company can make main caps for b-series?

i mean we cant change main bearing from to :

b16 to b18
b18 to b20
b20b t0 b20z
b16a to b16a
b20b to b20b

is that true?
i have b20b block without main caps? what should i do buy from some company?
or take another main caps from another engine like b16?
actually i have b16a main caps i guess its little smaller idont know...

 

you are not supposed to change the main caps from diffrent engines. it can be done but you must have the block line bored/honed after.

then after you find some ghetto machine shop who thinks they can line bore the block, you will have to toss it in the trash because they probably screwed up the centerline of the crank.

so.....find another block that is complete

 

Anyone know if swapping out the crank into the same block with main cap combo is OK?

 

yeah common practice is to keep the block and main caps together cuz they were machined together from the factory.

 

well actually i have b20b2 block i bought just the block without anything befor 6 months
and im surprised we cant use the block without original main caps they come from factory??
ok at this time what should i do. buy another one?? or there better way?
like line bored i hear it from other ppl but they said u cant do it if ur engine use turbo sys idont know what it is exactlly.
please is there any other plan?
thanks

 

If you use different main caps than the block came with it needs to be line bored so that the bores are true. It's no big deal.

 

you can used the different main caps as long as you get it line bored at a machine shop thats worth a ****.

 

There are very few machine shops that can line bore a block and not change positioning of the crankshaft. If the crank moves up in the block you'll have oil pump problems. With the availability of b20 blocks, you are better off tossing that one and finding one with the mains intact.

 

ill buy another block cuase the block cost me $112 just the block without anything.
and i ask for line-bored it cost from $120 to $160.. so i guess better buy new block
thanks