Original Message
RE: 427 Valves in 428 Heads/Blocks?
By Royce P - 05/30/2006 2:12:36 PM; IP 70.154.14.3
You can use them but the extra valve size will not necessarily help performance. Many FE head porters claim that CFM actually is the same or a little less when going larger than about 2.12 in a 4.19" bore.

Be sure to check valve to piston clearance, the valve reliefs are not positioned properly in many brands of aftermarket FE pistons.

Royce
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Collapse <a href=../ForumFE/reply.aspx?ID=27458&Reply=27458><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor27458" onclick="return false;">427 Valves in 428 Heads/Blocks?</a>&nbsp;-- <font color=#0000ff>HPINXS, <i>05/30/2006</i></font><script type="text/javascript">
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 427 Valves in 428 Heads/Blocks? -- HPINXS, 05/30/2006
RE: 427 Valves in 428 Heads/Blocks? -- Royce P, 05/30/2006
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