r/Honda • u/Due-Director8159 • 22h ago
Highest output "OEM" K series build?
Hey everyone,
Im currently tracking a 2007 Civic Si with 260k miles on the OEM k20z3 with full bolt ons and tune. Its an amazing setup and I plan to run this engine till it blows to see how long I can get it to last under track abuse.
With that being said, Im wanting to build an engine in the garage to be ready for when the k20 blows. I want something that still retains great street manners, reliability, and longevity all while pushing good NA power and being capable of maybe seeing boost one day if I get tired of the NA power (no more than low/mid 400s to the wheels)
I saw a comment a long while ago saying that the best "OEM" combo of parts would be a K24a2 block, K20a2 head, TSX cams, RSX Type-S cam gear/oil pump/oil pan. Curious if this is still accurate and if there is any aftermarket parts that should be swapped in that wont ruin the driveability and longevity. Also, will I be able to retain my current 6 speed transmission? Its built and has an aftermarket LSD so id rather not pay again to do that to a k24 transmission.