Dyno numbers for a 98 Formula
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TECH Enthusiast
Joined: Jun 2004
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From: Tinley Park, IL
Originally Posted by Another_User
They had an interesting article about the LS1 in...I think it was Car Craft. Apparently, there are two processes by which the heads are made. Most are sand-cast or something like that, and the rest are made some other way. The way you can identify the better ones is they have triangular marks in the casting under the sparkplug holes. Supposedly they flow considerably better and offer a few percent more horsepower. It would account for a lot of the factory freaks, if true.
