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Precision Race Components CNC Ported 6-Bolt 265cc Aftermarket Casting LS7 Heads & Cam Package

$3,499.98
Precision Race Components Aftermarket Casting 6-Bolt 265cc Fully CNC Ported LS7 Heads Assembled With Hollow-Stem Stainless Steel Valves (Titanium Upgrade Available Below), TSP Dual Valve Spring Kit with PAC .660" Springs and Titanium Retainers; Kit Also Includes TSP Hardened Pushrods & Your Choice Of Camshaft!

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Selected Size Sold Out! Pre-order Now - Shipping June 2018
SKU: 199-PKG16
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  • Precision Race Components Aftermarket Casting 6-Bolt 265cc Fully CNC Ported LS7 Heads Assembled With Hollow-Stem Stainless Steel Valves (Titanium Upgrade Available Below), TSP Dual Valve Spring Kit with PAC .660" Springs and Titanium Retainers; Kit Also Includes TSP Hardened Pushrods & Your Choice Of Camshaft! ​ When selecting your camshaft, please keep in mind that the LS7 rocker arm ratio is 1.8:1 and NOT 1.7:1 like all of the other LS-based engines! All of our LS7 camshafts are listed with the 1.8:1 rocker ratio, but any of the lobes on our custom-grind lobe sheet will all be listed as 1.7:1. The cylinder heads come standard with a hollow-stem stainless steel intake valve, which is heavier than the titanium valve option. The following lift numbers are the recommended maximum valve lift that can be safely run with each valve choice: Hollow-Stem - .625"; Titanium - .660". Again, keep in mind that these are the total valve lift numbers (cam lobe lift x rocker arm ratio). ​ All of the camshafts listed are built using your choice of a three-bolt or single bolt cam core. You will need to select the 3-bolt conversion package if your car originally came with a single-bolt cam core. This will include a new GM 4x 3-bolt upper cam sprocket, as well as a pack of ARP cam bolts. The new sprocket will work with your existing lower sprocket and timing chain, so no other parts will be required. All of the optional Cloyes timing sets are built for a three-bolt cam core and are specific to the LS7/LS9 dry-sump oiling system. **You must have a minimum of a 4.10" bore size to run these cylinder heads!**

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