Vortec L31 cylinder head
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The stock Vortec valve springs are single wound without a damper. The damping is done by the spring ID being a close fit to the guide boss OD; this damps the spring without the added cost of an inner flat wound damper seen on the Gen 1 SBC throughout its production. | The stock Vortec valve springs are single wound without a damper. The damping is done by the spring ID being a close fit to the guide boss OD; this damps the spring without the added cost of an inner flat wound damper seen on the Gen 1 SBC throughout its production. | ||
| − | The stock springs are not suited for high performance use. There are several replacements for the stock springs, among the best is the beehive spring and retainer combination from Comp Cams. There are two part numbers for the different spring rates: | + | The stock springs are not suited for high performance use. There are several replacements for the stock springs, among the best is the beehive spring and retainer combination from Comp Cams, originally designed for the LSx engine series. There are two part numbers for the different spring rates: |
| − | *26915- 105 pounds at 1.8" installed height; 293 pounds at 1.2" | + | *'''[http://www.compcams.com/WhatsNew/NewsDetails.aspx?ListHistoryID=164462240 26915]'''- 105 pounds at 1.8" installed height; 293 pounds at 1.2" (according to Competition Products catalog info); spring rate 313 lbs./in (according to Summit Racing catalog info) |
| − | *26918- | + | *'''[http://www.compcams.com/WhatsNew/NewsDetails.aspx?ListHistoryID=1166393320 26918]'''- 125 pounds at 1.8" installed height; 367 pounds at 1.15" |
| − | + | Both of these springs need to be installed using the correct retainer for a Vortec valve- Comp Cams p/n 787 (steel) or p/n 788 (titanium), NOT a retainer originally for the LSx engines- the LS engines have 8mm metric valve stems. Also note the specs are with an installed height of 1.8". | |
==Rocker arm studs== | ==Rocker arm studs== | ||
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