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"/> | [[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"/> | ||
| − | 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. | + | 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. An engine built with ''unported'' large port Bow Tie heads (FASCAR (Florida Association of Stock Car Racing rules) 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. |
==Recommended spark plugs== | ==Recommended spark plugs== | ||
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