Originally Posted by lowhirod
has any one used the Edelbrook 60979 E-tec 170 aluminum heads in a votec head swap?
This is a nice head falls between the Vortec and the Fastburn. Very good on smaller blocks or street performance 327 and 350's. Has a very good exhaust which if the head ports are not molested with a grinder is better with a single pattern cam rather than a dual-pattern unless your really good at tuning an N/A engine or running nitrous or a mild blower. Somewhat light of casting it isn't a race head but has a bit more heft than GM's L98 casting which I'm not comparing performance at all only structural strength, the E-Tec 170 on otherwise equavelent short blocks will have the L98 for lunch.
Like aluminum heads, it wants more compression to make up for the faster heat transfer into the coolant than cast iron, but this rewards you with more power. It likes the squish/quench tight .040 or a tad less but it's not crazy with very thin shim style gaskets which tend to abraid the aluminum. It likes a thicker composition or MLS gasket which then to get thesquish/quench dialed in pretty much drives a zero or near zero deck block. You'll find yourself experimenting with push rod lenghts compared to the simplicty of the L31 head.
They'll take about 30 pounds off the front wheels compared to the L31's.