Cam and Valvetrain
TA aluminum blocks use a special cam profile that has even-fire cam lobes, but with a modified '77-and-earlier odd-fire nose design that has a removable distributor drive gear. This is necessary because the large thrust plate on stock-style even-fire cams hits the front oil-galley plugs, as well as to accommodate a special bronze thrust/antiwalk spacer to prevent the camshaft from damaging the aluminum block's front surface. The profile itself is a mild Comp Cams hydraulic-roller grind. It has a duration of just 215 degrees at 0.050 inch and 0.534-inch valve-lift with 1.60:1 rocker arms. See what we mean about streetable?
Cylinder Heads
TA solves the problem of Buick V-6 new performance head availability with its line of aluminum V-6 heads. Two versions are offered: the Street Intimidator that can use stock valvetrain parts, and the Street Eliminator designed for serious engines. The latter require the use of full-on racing pedestal-type roller rocker systems. Both have provisions for 14 head bolts, but will also work on stock 8-bolt blocks.
This engines uses the Eliminator heads, packed with Manley 0.100-inch-long "small-block Chevy" valves--1.940-inch Severe-Duty NK-844 stainless steel (PN 11886) on the intakes (back-cut 30 degrees by Duttweiler), and 1.600-inch, Extreme-Duty, turbo-heat-resisting, XH-428 Inconel (PN 11701) on the exhaust side. The valves ride in bronze-wall guides, sealed with Duttweiler preferred U.S. Seal metal-body/rubber-top valve-seals to control oil--detonation kills turbo engines. Duttweiler bolts the heads to the block with the full 14 head bolts and Fel-Pro PN 1007 Lok-Wire copper-wire gaskets that require machining O-ring receiver grooves in the heads.
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