3400 performance build, which direction?

[kris gtwhat?]

i would.. but then i'd have to kill ya haha

[Bridgetown]

the reason i went with a 3400 bottom end is for aftermarket purposes. im nearing completion on a 3450 turbo build and keeping the 3400 has availability for forged pistons through bens store, and im using small block chevy forged rods (that was not a bolt on however). i will lose the .1 liters of displacement to have a bottom end good for 600+ horse. plus having the 3500 top end, i have all the benefits of the flow they carry. kinda like the best of both worlds you could say

Could you dish some details on the turbo setup for your build?

[kris gtwhat?]

no you cant. they sit offset in the rod.

i believe mine needed turned down .085" per rod to fit the crank. so not much.

bearing p/n- cb745 HN

these bearings are clevite high performance, and are the perfect width for the machined rods

[pocket-rocket]

I'll leave that to someone who's done the mod, but I believe the locating tangs are different/in different spots.

[bonezdebomb]

could you use 60v6 6 bearings instead of turning sbc bearings?

[pocket-rocket]

how did you swap the rods?

SBC rods have the same length, small end journal size and big end journal size, the main difference (besides having 8 in a SBC and 6 in a 60v6) is the big end needs turned down narrower to fit the journal on the crank of the 60v6 because it's too wide. You have to have the bearings done as well when you have rods modified in this way, but at least the cost and ease of getting forged rods offsets machining costs vs a custom one off set of 6 rods.

[bonezdebomb]

how did you swap the rods?

[kris gtwhat?]

exactly

[pocket-rocket]

.1l displacement loss really isn't a loss when you consider the insurance you now have in your bottom end, especially when it will be made up many times over from going with boost.

[kris gtwhat?]

the reason i went with a 3400 bottom end is for aftermarket purposes. im nearing completion on a 3450 turbo build and keeping the 3400 has availability for forged pistons through bens store, and im using small block chevy forged rods (that was not a bolt on however). i will lose the .1 liters of displacement to have a bottom end good for 600+ horse. plus having the 3500 top end, i have all the benefits of the flow they carry. kinda like the best of both worlds you could say

[Rootie524]

yeah thats very true but i wouldnt go that crazy..just improve it alittle. the gears are huge and it pisses me off..but i also like maxing out at around 130mph..that would go away if i changed gears for acceleration like u said.

[pocket-rocket]

so changing gear ratios wont help drive train loss but it would help me see more power (acceleration) at the wheels, right?

The down side to regearing that way is your rpms at highway speed goes up and can hurt highway economy if you go with gears too far oriented towards acceleration. That's why Borg Warner is making an aftermarket T56 (6 speed manual) that is aimed at old classics since most of those (that are manual) have a 4 speed. They might run 11's in the 1/4, but no one wants to howl down the highway at 60mph at 4000 rpms.

[Rootie524]

so changing gear ratios wont help drive train loss but it would help me see more power (acceleration) at the wheels, right?

[bszopi]

Yes, you can. Will it help out your drivetrain loss? Nope... And yes, there are threads discussing building up and modifying a 4T4x-E.

[Rootie524]

so to account for the difference like pocket-rocket stated..its mostly drive train loss cuz of my 4spd auto.. i dont want to thread jack too much but is there a way to change FDR and gears in a 4t45e? is there a thread already or should i start a new one.