Posted by R.Davis on December 08, 1998 at 21:27:45:
In Reply to: Improvements to 230/251 flatheads during rebuild? posted by Chris on December 08, 1998 at 11:48:30:
Later model 251's have full-pressure type engine lubrication,using a full-flow type oil filter.The intake&exhaust port are in the block and are very well cast with a relatively smooth surface,but it probibly would'nt hurt to polish them some.Of course matching the intake&exhaust to block ports would help and a dual carb intake is the only way to help it breath better unless you get real cocky and use (3) carbs,one for each port but will reqire the use of a syncro gauge to set them for opt. performance.Early 60's 251's had about 115hp net at about 7:1 comp. but later 251's had about 125hp at about 8:1 comp. so yes raising the comp. helps but a Lhead is limited by design.A hi-po cam plus there have been articles on converting the dist. to early 70's type which produces a hotter spark.Last but not least, yes I have, but becky does it better!