[DeTomaso] Dyno Trip #1 and Roller Lifters.....

[JDeRyke at aol.com]

In a message dated 10/14/10 2:27:49 PM, steven.liebenow at att.net writes:

> Apparently the high volume pumps still cause some pressure increase at 
> speeds, with Ford lifters (and perhaps others!) and that you can then lose 
> performance due to the valves staying open....
> 
I agree. We had once a 351-C owner in Nor-Cal that had a heavily built flat 
tappet engine with valve float at 4800 rpms. By changing from a high 
pressure oil pump to a std pressure one, the rev range magically went to 6500 with 
no other changes! According to the old timer that diagnosed the problem, 
this can happen with a high pressure relief spring in a std pump, too. As I 
keep saying, high pressure and high volume oil pumps often cause more trouble 
than they solve, on street motors. Glad your ride is moving smartly down the 
road now. Cheers- J Deryke