Quote:
Originally Posted by sleepyalero
oh i think if you use 3400 upper, you need to use 3400 lower and maybe 3400 heads. but could still run the 3500 block. i honestly forget. milzy told me the options a few months ago but alot has happened since then. milzy or someone here can confirm that.
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You can use the 3400 upper with the 3500 Lower/heads no problem. It is the easiest route for a 3400 to 3500 swap, but I'd grind off the "3400 SFI" and powder coat the UIM. The 3500 heads that cant be used with the 3400 lower.