18 Degree These aluminum 18º cylinder heads were released for Chevrolet 350, 9.1 compression NASCAR racing engines. . Note that just like the 23 Deg heads, the intake runners on each side of the engine are connected (Siamese)in two pairs. These heads are similar to P/N 10134364, except they came new with an additional .080" on the deck and an added .055" to the intake manifold flange to maintain port alignment. To raise the compression to meet your need, on would machine the deck surface. Valve spacing is 1.935". This head is recommended for cylinder bore diameter of 4.000"-4.155". Intake valve seat material is almost always beryllium copper. Exhaust valve seat material is usually beryllium copper. Valve guide material is manganese bronze. Valve guide clearance ("Typical" valve stem diameters): intake is 0.0012" and exhaust is 0.0016". 65cc combustion chambers are original but other sizes are common depending on purpose. Fully CNC ported. Required Components: Common Intake valve diameter is 2.15"; "back" angle is 12 degrees; length is 5.45" or 5.55". Exhaust valve diameter is 1.625"; "back" angle is 25 degrees; length is 5.45" or 5.55". Rocker arms (shaft mount): intake (with flat tappet) is 0.550" offset; intake (with offset roller lifter) is 0.450" offset; exhaust is 0.150" offset. Recommended Accessories: Intake manifold is P/N 10185053, 24502481, 24502487, or 24502579; intake manifold gasket set is P/N 10185007; head gasket is P/N 10185054; rocker cover P/N 10185064. X-Ray 18 Deg. Head: This 18º V8 head is the same as P/N 24502580 except it is x-ray inspected to insure quality, then hot isostactic pressed (hipped) to remove porosity, and it then receives special low volume heat treatment. This head was designed for 9.1 NASCAR engines. Pricing varies so much on used cylinder heads & Intakes that we cannot list them here. A lot goes into the price, where they came from, how recent they were run, who did the port work, flow numbers, how much we had to pay and what is included. Prices range go from $2,000 to $4,500 for top quality NASCAR Heads & Intakes. Call us for an up-to-date quote and what's in stock, toll free 1-877-6MUSCLE |
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| Aluminum Used All used parts are subject to availability. We will notify you if out of stock. All parts guaranteed or money back. |
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