Do you know if there is a major difference in performance or if its harder to make hp with the red top?
My source is actually an article from super street magazine. Also, I thought that it was the black top SR's that had lines (fins) cast into the front of the cylinder head. What are 54c...
I'm only talking about the early model SR's with out vvt. And I did do my research. One source says that the black top s13 engines make better candidates for upgrades because thier cylinder head design breaths a little better than that of the red top engines. I was wondering if anyone knew to...
I just bought a 1993 240sx and am planning to do an SR swap. I can't decide wheter to shell out the extra cash to buy a black top instead of a red top. I was wondering if there are any major differences in performance and if so, what those differences are. Any help would be great! :cool: