Jan 30, 2002 · On the street, the Edlebrock O port heads will work better and make at least 550 HP. I have a set of the L88 heads that I don't need if anyone is interested. they work really well …

May 26, 2002 · The "074" heads were state of the art when they made their debut in the late 1960s, but technology has passed them by to some degree. They are still a more than …

Dec 19, 2009 · Factory Correct Resto - L88 Aluminum Cylinder heads - I bought an engine a few years ago and was told that it had L88 heads. All I know, without getting the casting #'s, is that …

Jul 3, 2008 · L89 - same as L71 (tri power carbs) but aluminum heads L88 single Holly 4 barrel carb aluminum heads. I think both are solid lifter 4 bolt main motors, so really I think the main …

May 4, 2005 · It is true that they were the same for 67-68; however, the 69 L88's and the new ZL1 option got the new open chamber heads. The 69 L89 still used the closed chamber heads. …

Feb 22, 2005 · Factory Correct Resto - 69 L88 heads what are they worth?? - I have come across a set of 69 L88 Aluminum Heads. Casting number 3919842. These were purchased from a …

Mar 18, 2004 · The L88 had higher compression, the aluminum heads, more camshaft, different carburetor, different intake, no pcv system, and a different advance curve on the distributor. It …

The L88 is a 427c.i. powerplant fitted to Corvettes from 1967-1969. Not many, mind you, with only 20 so-equipped in 1967, 80 in 1968, and 118 in 1969. That makes a grand total of just 218 …

Feb 11, 2009 · The GM heads use the 12462970 springs The L88 used the 3916164 springs. The new springs have more seat pressure and a heavier rate (hydraulic roller springs). Might want …

Oct 24, 2015 · Basically Chevrolet had aluminum heads out on big blocks as early as 1966, but with problems (Penske cars, etc.). They had HD and L88 stuff out during this time prior to …