275 H.P. out of a 292 is easy but costs a few bucks. Lump ports help flow numbers but aren't needed for only 275 H.P. Just a nice port job and a bit bigger valves with a good cam of about 460 to 480 lift with a 600 cfm 4 barrel and headers will get you near there. My 3 Weber with that cam and big valves and tube headers makes near 325 H.P. With lumps and more cam etc. the 292 can make upwards of 400 H.P for a street engine. The 6 cyl. sound is music! I am an Inliner club member, it is great for us I-6 guys.
