I believe the rollers to be more of a longevity and noise reduction move on GMs part. The added HP is a byproduct.
But here is a question for the masses, and it'* a viable one. For the sake of arguement, lets take 2 L67s S1s. Everything between the two are the same, except that one has type "A" intake manifold, and the other type "B". Now then, would GM have created a new PCM instruction set for the new-style intake?
Here is why I ask: The HP/Torque ratings for all of 1993 stayed the same, regardless of the manifold. So, using that logic, no engine is better than the other, performance-wise. Experience tells us that a taller intake *should* net a slightly stronger low-end torque (which, as stated, the walled intake is a tad taller). The walls *should* also provide a straighter path for air to flow into the head, which should increase torque again, and a slight advantage in fuel efficiency. One would think GM would have further exploited that design through modifiying the PCM'* program.
And I haven't seen any S2 L67 LIMs, so I ask the question "Are those intakes walled too?"
Originally Posted by Drunken Sailor
Will, are the L27 rockers the same ratio as the L67? I know of a couple scrapped L27s I could steal rockers off of, but no 94/95 L67.
Yes, they are the same ratio. Amazingly, the valvetrains between the two are identical. Same lifters, valves, springs, pushrods, and arms.
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.