3800 wiki

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<h1>Heads</h1>
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<h2>Stock Heads</h2>
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All 3800's were equipped with Iron cylinder heads, however there are a few differences between the series 2 and series 3 heads as far as performance goes.
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Series 3 and series 2 heads are identical and can be interchanged, however the series 3 heads have slightly larger intake valves.
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Series 3 intake valves measure 1.83" in diameter
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Series 2 intake valves measure 1.80" in diameter
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<h2>Series 2 casting differences</h2>
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<a href="https://www.gmforum.com/performance-brainstorming-tuning-96/sliced-2261-early-l36-castings-4781-castings-next-253593/page2/" class="urlextern" title="https://www.gmforum.com/performance-brainstorming-tuning-96/sliced-2261-early-l36-castings-4781-castings-next-253593/page2/" rel="ugc nofollow">https://www.gmforum.com/performance-brainstorming-tuning-96/sliced-2261-early-l36-castings-4781-castings-next-253593/page2/</a>
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<h3>Maximum Lift</h3>
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Stock heads will support .525" lift on the intake and .528" on the exhaust valves before running into risk of contacting the valve seat.
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<a href="http://www.fullthrottlev6.com/forums/showthread.php?56830-max-valve-lift" class="urlextern" title="http://www.fullthrottlev6.com/forums/showthread.php?56830-max-valve-lift" rel="ugc nofollow">http://www.fullthrottlev6.com/forums/showthread.php?56830-max-valve-lift</a>
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You can of course machine the valve seats to allow more lift. Another option is to utilize viton valve seals and modified retainers to make a little more room for more lift.
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<h3>Porting and Polishing</h3>
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Stock heads can be ported quite a bit to see a lot of gains. Most aftermarket heads are just precision ported and polished factory heads.<br/>

Check out the porting and polishing page for heads: <a href="/doku.php?id=performance:enginemods:pnp:heads" class="wikilink1" title="performance:enginemods:pnp:heads" data-wiki-id="performance:enginemods:pnp:heads">Porting and Polishing Heads</a>
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