To start off, 1967 saw the usual little yearly tweaks to Corvette styling like a redesigned interior, redesigned rocker panels, redesigned gas cap, redesigned side louvers, and (for the first time since 1963) redesigned wheels. There were also some new options like headrests, a speed warning indicator, and on the most powerful big blocks, a racing stripe over the newly redesigned scooped big block hood. Not all Corvettes were big block, of course, even in 1967, as 57.69% of Corvettes still were sold with the 327, meaning most of them. Several changes were made, however, in the engine options. The L75 was still standard, and the L79 was still the top 327 option. In 427 engines, you could still buy the L36, although it was now marketed towards buyers with the Powerglide automatic transmission and air conditioning, as the 327 struggled to achieve normal performance with these options dragging off horsepower. You didn't necessarily have to be a race driver or street racer to want a 427 in that case. New for 1967, however, was the L68, a downgraded L71 with 400 horsepower that was also marketed to Powerglide buyers. The L72, however, was gone. Why? Because in 1967, Chevrolet finally agreed to sell the L71 as a regular, R.P.O.! The L71 already had three racing seasons behind it as a crate engine, so this was quite a development. 3,738 were sold, too, so it wasn't like it was a special race-only option, either. Zora Duntov actively promoted it as a more practical (and he was probably thinking safer) alternative to the L88, which even more amazingly was offered as an R.P.O also, although only 20 were sold. Duntov's argument was that the L71 worked much better with a street exhaust system and tires, and that these features would strangle an L88. At the very least, the L88 required racing fuel, and was prone to overheating in street driving. Nevertheless, even the L88 wasn't the rarest of 1967 Corvettes. This title had to go to the L89, the ultimate street Corvette, with only 16 built! The L89 wasn't even counted initially as a seperate engine option from the L71, as its specifications were nearly identical, but it did have the aluminum heads off of the L88, shifting the Corvette's weight distribution back to 49front/51rear, which was close to Duntov's original intended distribution for the 1963 L84. In subsequent years, it had shifted forward, until the L78, L72, L36, L68, and L71 had all pushed the weight to 51front/49rear. The L89 was also said to develop 475 horsepower gross, even if it was only advertised at 435, and some people even thought that the L71 could put out 450. Therefore, I've chosen to make the street 1967 Big Block Corvette for Redline an L89, with 435 net horsepower!! It's very fast indeed, especially since I've also given it an M22 transmission and a 4.11 POSI differential!!! Duntov's theory about it being faster than an L88 doesn't hold true in Redline, though.