[DeTomaso] Comp Cam Kits

[JDeRyke at aol.com]

In a message dated 7/30/09 9:00:06 AM, tborcich at msn.com writes:

> They're Xtreme Energy are Hydralic Flat Tappet cam kits that looks pretty 
> good. Any feedback on quality of their products?
> 
Not on their quality- which is pretty good, but keep in mind that you 
should not run a hydraulic lifter cam AND a set of the common oil restrictors 
that limit oil flow to the cam and rockers. After 35 years, many blocks have 
been converted- even cores found at rebuilders. At low engine speeds, 
restrictors starve hydraulic lifter innards and they will rattle. If the noise 
doesn't bother you and you keep the revs up, the combo will be OK on the street. 
Otherwise. remove them. And the rattling will convince non-knowlegable 
onlookers that you have a radical solid lifter cam in there- good for bragging 
rights at the donut shoppe.   

Second thing: after 10-20 miles of use on ANY aftermarket camshaft, pull 
the distributor and check the gear teeth. There were a rash of cams made with 
the integral gear teeth cut at the wrong pressure-angle. One such cam wore a 
distributor gear to razor-sharp teeth in 5 miles! There are only two or 
three cam-blank mfrgs in the U.S, and all grinders buy blank cams from them to 
make their products. The number of 351-C cams sold is pretty small so 
purging bad stock is slow- the gear angle cannot be seen by eye- it has to be 
measured. A warranty-replacement cam won't pay for the total rebuild your engine 
will need from pumping gear-tooth pieces thru the bearings and scratching 
the cylinder walls. FWIW- J Deryke



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