Vortec L31 cylinder head

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 [[File:Vortec dome piston long rod.jpg|350px|left|thumb|KB domed piston for the Vortec head. This example uses a long rod]] <br style="clear:both"/>
-Consider this: These heads have 170cc intake runners. As such, they will do a very good job on a 355 small block Chevy motor when used as a daily driver with a flat-top or dished piston. If a builder has high static compression ratio in mind for the build, he would be silly to use the small runner heads with domed pistons to make high-rpm horsepower because the heads will stall sooner than larger runner heads . He'd naturally choose a different head that would flow more CFM. Therefore, I see no use for domed pistons to be used with L31 heads. An excellent 9.60:1 static compression ratio 355 street motor that will operate on pump gas can be built using a 12cc dished piston and 5.7" rods.....
+The reason for domed pistons is because the large port Bow Tie Vortec head can only be milled to about 51 cc. This will give about 12:1 CR using flat top pistons. So if a higher CR is required, domed pistons must be used. Such an engine made over [http://www.chevyhiperformance.com/techarticles/148_0506_gm_bow_tie_vortec_small_block_engine/viewall.html 630 HP/500 ft/lb torque] with 12:1 CR.
-techinspector1
 ==Recommended spark plugs==

Revision as of 16:33, 3 January 2013