summit racing ls3 hyroolic cam cnc ported cylinder heads

We sell an ideal spring kit for these heads. Our CNG L元 has more average flow than the stock LS7 and only 18 CFM shy of our highly modified LS7 head.įor performance applications with this big valve head, we feel that a conical or beehive spring is inappropriate and should not be used. It should be noted that in the stock form, we have found the L92 to have more average flow than the a stock LS7 under. We see no need to CNC the combustion chamber except for small bore applications. The combustion chambers can be CNC machined or left alone, depending on application. Finally a LS7 large valve version is available for large bore combinations. However, standard valve sizes can be utilized for engines of 6.0 liters and up. A smaller intake or exhaust valve would be more appropriate for engine sizes less than 6.2 Liters. LS3/L92 heads can be modified in several ways.

These heads are currently sold as new GM castings which are further CNC modified per the customers needs. When making valve train determinations for the L92, valve weight is very important.

The new Factory Hollow stem valve for the LS3 Corvette may be the best choice for weight and price point for a performance L92/LS3 head. As Manley Race Master valves are approximately 23% heavier than a factory hollow stem valve, we do not advise using them. So, a factory valve does flow as well as a Manley Race Master. We have found the L92 ports to not be sensitive to valve shape, valve cosmetics or brand. Our Port design does not kill low lift flow. Poorly designed CNC ports can kill port velocity and should be utilized on engine sizes over 370 cubic inches. CNC versions of this head can add up to 20cc's to the intake port volume. The small bore LS3 may be an inexpensive solution to a high RPM small bore engine. We have designed the correct camshaft to work with this combination.

In stock form, this head could create the characteristic dip in the lower rpm area. This head utilizes a smaller intake valve to prevent cylinder bore impingement.

However, we produce a small bore version of this cylinder head. This new casting is designed for engine sizes of 6.0L or bore size of 4' and larger. RLD Performance LS3 CNC cylinder head has more velocity, average flow and peak flow than a stock LS7 cylinder head.

Summit racing ls3 hyroolic cam cnc ported cylinder heads