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Discussion Starter · #1 · (Edited)

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Interesting. From the pictures, it appears as if the intake ports are smaller than the ones on the LS6, if those are indeed LS7 heads.
 

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Discussion Starter · #3 ·
they're not as tall, but they're much wider-- just like the C5R heads (below):



12480005 Cylinder Head, "Gen 3" V8 (LS1)
The "Gen 3" V8 (RPO-LS1) engine is used in all 1997 and later Corvettes, and 1998 and later Camaros. A special manifold must be fabricated to use this head. Use with special cylinder block P/N 12480030. To compete successfully in GT-2 racing an aftermarket parts development started with the intent of providing the new GM powertrain LS1 engine a higher performance platform. The first component designed was the cylinder head with an intent to provide a part that was similar to the LS1 in appearance for sanctioning body approval. The cylinder heads include the following features: The basic height, width and attachment faces are in stock location to dowel and deck position. All dimentions and fasteners are metric. The basic valve angle was revised from 15 to 11 degrees to produce a smaller chamber. The valve angle also provides more space for aftermarket rocker arms. Jesel valve train systems has provided the current race pieces. The production individual pedistles are cast into a continuous feature tieing all the bosses together. The rocker cover hold down bosses are incorporated into the rocker arm plateau for the 4-bolt center hold down type cover (1999 model year). The chamber volume for the P/N 12480005 head is 38cc with flat faced valves of .75mm inlet and 1.5mm exhaust margins. The P/N 12480090 provides additional material for CNC porting and chamber shaping and starts at a volume of less than 30cc's. The inlet port roof and floor is raised and the attachment pattern is designed for a Kinsler fuel injection manifold. Inlet port is 57.15 x 36.58mm / 55.957mm dia. precision finished. The cylinder head is machined for larger diameter springs (41.5mm or 1.63" dia. machined pocket). The exhaust flange is identical with the production part. The exhaust port is stock size. The head is machined for a 12.712 / 12.688mm dia. valve guide bore. Rocker cover oil rail seal is a reverse tapered groove for a 3.2mm dia. (.125") free length "O" Ring.
 
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