Just look at my Sig
Stock L27 block in my 94 regal. Any ideas for mods? Exhaust/ and throttle body filtering will be done in spring/summer. Those are basic modifications
After reading a very written page on GM'* TPI system, I have realized after 4800, not matter what mods, my engine will never peak higher than that. The fuel system lacks the ability to distribute a proper mixture at higher rpms, and it chokes the engine, which is why all of the L27'* are rated stock at 4800 rpm for peak HP.
Revving any L27 past 5000 rpm is useless. New valves, cam, rockers, and head work done would only further the peak horsepower around 4800. It will remain the current beautiful bottom end block we have all come to love. So I guess you can sum it up in 2 ways.
1. The Low End Torque Is Here To Stay, Forget About Your Mods
2. An Efficient Highway Driving Car
3. Responds Very Well To Mods
4. Extremely Reliable
1. Choking Issues at RPM >4800
2. Not Fuel Efficient For On and Off Throttle Driving
3. Not an L67