850-inch in diameter and is used to locate the 1.250-inch outside diameter (O.D.) valve spring. Heads are assembled with NEW 1.60 Stainless Steel ONE piece Exhaust valves.The Vortec head features a very large boss at the base of the valve guide that measures. Heads are assembled with NEW 2.02 Stainless Steel ONE piece Intake valves. NEW PAIR of aftermarket GM CHEVY VORTEC 350 V8 5.7 OHV CAST IRON PERFORMANCE CYLINDER HEADS 2.02 STAINLESS VALVES 9 - 2000.
Compressor bracket fits all G.M aluminum heads including the fast-burn aluminum heads and may be used on 1969 thru 1986 cast iron heads by drilling and tapping one hole for the upper mounting point. The alternator bracket will fit all 1969 and newer heads and mounts: GM 10si, 12si or CS130 alternators that have 6:00 & 12:00 mounting ears. We use the new, new Chevrolet produced casting for applications that require the factory Vortec head. Since its introduction in the late 1990’s there have been a few “versions” of the factory Vortec head. Rear gears are stock 3.08's vinniekq2The Chevy Vortec head is an excellent choice for a variety of performance and race applications. Just picked up a set of headers, I will add to the project. I have a screw in stud but it cannot accomodate guides. Not knowing I requested the screw in studs but no additional machine work. Vortec heads are fitted with screw in studs, but the seat of the stud and valve guide height is stock. Designed towards greater power output and torque, with a quicker response time, the automotive aficionados are leaning towards Vortec heads more and more. As engine technology advances, so many better options are becoming more available. sbc Vortec heads look new, bowtie dual plane intake vortec $140.00 - $350 (LANCASTER.OHIO) vortec sbc heads looks new, i bought a 400 sbc had these heads and intake on a assemble motor, the heads look new to me, i cant tell they have been ran myself,$350.00 for heads with guide plates and screw in studs, and it has a vortec style chevy bowtie. Originally, the stock #906 casting head was available in two versions. The Vortec heads are a little bit lighter than the older heads and have a “kidney” or “heart” shaped combustion chamber that is more efficient than the double hump chamber.