'95 L67 heads on an '89 LN3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-04-2006, 12:28 PM   #1
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Default '95 L67 heads on an '89 LN3

Howdy. As you guys have read, I've got the supercharged LN3 . I've read some mentioning of later heads having roller rockers. In my swap, I did not use the L67 heads.

Would I gain anything to make it worth it to install L67 heads on my LN3? WIll it bolt up fine? Thanks guys.
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Old 10-04-2006, 12:32 PM   #2
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They're not necessarily "L67" heads. They are 92 L27/L67 heads (without roller rockers) or 93-94 L27 93-95 L67 heads. Call them Series 1 heads with roller rockers.

You might gain 5-10 horsepower on the top end of the power curve.
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Old 10-04-2006, 12:57 PM   #3
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They are not full roller, though. No tip, just the fulcrum.
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Old 10-04-2006, 01:03 PM   #4
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I see. Might be worthwhile to do in winter storage. But hell, might as well do performance rockers while I'm there
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Old 10-04-2006, 01:35 PM   #5
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You can get Yella Terra full rollers for the 92 heads or the 93-95 heads.
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Old 10-04-2006, 01:59 PM   #6
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(I googled). Seems like Australia has a better aftermarket for 3800s than the US. Since it'* still on topic, about how much power gain would rockers give me?
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