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<blockquote data-quote="O4L" data-source="post: 3220702" data-attributes="member: 24429"><p>Not to derail this thread but I have a question you guys may help me answer.</p><p></p><p>Many years ago I raced roundy round on dirt tracks in the Street Stock division.</p><p></p><p>I put together a small block Chevy 400 that was bored .030 over with flat top 10:1 pistons and a high lift Lunati hydraulic cam. (I don't remember the specs).</p><p></p><p>Per the rules we couldn't use any after market carbs, intake, exhaust or heads.</p><p></p><p>With .194 heads I was getting a little over 7000 rpm from this combination.</p><p></p><p>A guy I knew loaned me a set of .202 heads that had been polished to try out and without any other changes, I lost nearly 1000 rpm from the new combo.</p><p></p><p>After one night of racing I changed back to the .194 heads and never looked back.</p><p></p><p>So why the big drop in rpm?</p><p></p><p>It's probably a simple answer but one that I never really looked into to figure out what caused it.</p></blockquote><p></p>
[QUOTE="O4L, post: 3220702, member: 24429"] Not to derail this thread but I have a question you guys may help me answer. Many years ago I raced roundy round on dirt tracks in the Street Stock division. I put together a small block Chevy 400 that was bored .030 over with flat top 10:1 pistons and a high lift Lunati hydraulic cam. (I don't remember the specs). Per the rules we couldn't use any after market carbs, intake, exhaust or heads. With .194 heads I was getting a little over 7000 rpm from this combination. A guy I knew loaned me a set of .202 heads that had been polished to try out and without any other changes, I lost nearly 1000 rpm from the new combo. After one night of racing I changed back to the .194 heads and never looked back. So why the big drop in rpm? It's probably a simple answer but one that I never really looked into to figure out what caused it. [/QUOTE]
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