ssfast99

iTrader: (3)

okay search does not really help for my aplication and i respect the guys in this section to answer nonbias and have helpful info.

i have a ls2 bare block that will be built with a 4.0 stroke and 14:1 compression. it will have a big solid roller cam, afr 225 or tfs 215 heads with victor jr intake. it will be setup for a 2 stage 300 shot. looking to get close to 900rwhp.

i know it is going to be really expensive but was wondering if i should leave the 4.005 bore or go with a bigger bore. just curious how much more power will a 4.125 bore make in my application and how does the bigger bore affect the life of the motor. it is by no means a daily driver and will only see 110 or higher leaded gas.

veee8

iTrader: (40)

Well the larger bore will really shine on high flow heads. It will help unshroud the valves and the potential to make more power goes up.
A lot of companies advertise their flow ratings on heads with a 4.125" bore.
If it is a max effort engine the bigger bore could be worth the expense.

KCS

iTrader: (20)

Probably not worth it if you're going to run 225/215cc heads, unless the valves are larger than 2.08". Gains will probably not be worth the time/money/hassle of sleeveing the LS2. If you still need more power, put in bigger jets.