Were building a b20 here at the shop and We need suggestions heres what we want to do.
high compression 10-5-1
port polished head
block guard
75 shot of nitrous
Pistons aftermarket cut to match head
Ls head
Here is our goal low 13's high 12's Reliably without v-tec
any suggestions would help thanks

 

If you're not going to increase the bore size, I don't see why you would need to have the pistons "cut to match" the head. I don't think aftermarket 84mm pistons will need to be modified to work with a stock B20 head. If anything, while you're getting the head ported, you can have the cylinders deshrouded if you think you're not going to have enough clearance for the higher comp pistons.

 

The Block Has Been Bored Out To Just under 2.2
What is needed to be done to make the block almosr bullet proof?
I have also heard that if the head is ported and polished aftermarket cams have no effect.

 

If you bored a stock B20 sleeve out to 2.2L, that would mean an 88mm bore, which would leave the sleeves extremely thin. Contrary to popular belief, B20 sleeves aren't much stronger than other B series sleeves, if at all. If you bore a stock B20 sleeve to 88mm, you're asking for trouble. If you want it to be "bulletproof", I don't see how you're going to achieve that without new sleeves.

 

We are using a b18b head. I am pretty sure we will have to modify the pistons. We had the block bored out 20 over. A block guard would probably help us get where we need to be. Thanks for your input. Any other suggestions will be greatly appreciated.

 

I would doublecheck your clearances before doing anything to the pistons. You may not need to modify anything if you only bored 20 thousanths over stock, but if you do need more clearance, I would consider having the combustion chambers on the head deshrouded to accomodate the new pistons while you're getting it ported.

 

The block has been bored out 20 over and we plan to use a b18b head so I am sure that the pistons need to be modified to match the valves. You have a good point (inspyral) about the Strength of the sleeve so a block guard will probably help us out a lot. Any other suggestions would be greatly appreciated. We need to look at every aspect of building this motor and it is very easy to over look key things. thanks

 

Please keep posts in this forum on-topic.
Thank you

 

Fixed the mis spelled word but I only need help on the motor.

 

If you don't care about a lumpy idle, look at Crower 404 cams. Be warned, you'll swear the car has morphed into a deranged Harley every time you pull up to a stoplight.

Also if you only bored 20 over, that's not going to bring the displacement up to 2.2 liters. Stock is 1973 cc, you're not going to gain 200 cc just from that small of an increase in bore.

What car is it going into and what kind of traction adders have you considered?