06-18-2008, 11:59 AM
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Senior Club Cobra Member
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Join Date: Jul 2001
Location: Carrollton,
TX
Cobra Make, Engine: JBL now SOLD
Posts: 1,735
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Not Ranked
We put in a hydraulic roller "Thumpr" cam in a 289/302 FIA car belonging to Jim Jacobs. It has 10.4 CR. It makes lots of mid-range to top end power, not as stout before 2000 RPM but it really screams. Look at the latest issue of Hot Rod, where there is an article of the top 5 best selling cams. The Thumpr proved to be the best overall. I am glad they did the test because many had the impression that this series of cams was more about sound than power.....not true.
You need the "Spider" installed to position the lifters to retrofit a non-roller block.
Motor had Edelbrock heads (milled) RPM intake, flat pistons.
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6th generation Texan....
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