[DeTomaso] Cam problems

[F. & D. Terry]

You may have a problem with the coils binding on your valve 
springs. The springs must be checked by rotating the engine 
through one cam revolution to ascertain the minimum coil 
clearance. Pushrod length is determined by observing that contact 
is centered with the valve stem.

Fred T.

steve meausette wrote:
> Hi all,
> 
> I need some major advice..........  I have just had my second Comp Cam go flat in my Pantera.  The first one went in about five mins of break-in time and the second in about ten mins of break-in time.  Both times never below 2000 rpm.  Both times  new cams (560 lift hydraulic),  the first time I used Comp Cams lifters (hydraulic) and the second time Crame lifters (hydraulic).  Push rods were measured and were the right length,  double valve springs (old and weak) when tripple are reccommended for this grind of cam,  Comp Cams break-in lube the first time and Crane break-in lube the second time.  I used an oil accumulator (3qt) and the oil pressure started off at 60lbs and gradually went down to below 20lbs (new guage) and that's when I shut it off.  Both times.  New oil pump both times.  I use an engine oil cooler.  Pete Jackson gear drive that has plenty of clearance, (new).  I pre-lubed the engine before I put the weber manifold back on (could'nt get anything in the dist
rib
>  utor hole after as the webers were in the way) and the oil pumped up through everything including the new lifters and pushrods (Comp Cams 3/8 pushrods).
> 
> I am now thinking of using a hydraulic roller cam and lifters.  I understand that they require no break-in time.  Is this true?  I don't know what lift and duration etc to use when ordering.  The engine is bored 30 over with Kieth Black pistons and reworked rods, windage tray, large oil pan, completely balanced,  Webers and 180 degree headers.  I am after a rough sounding idle.  The car will not be raced but street driven.  I have never used a roller cam before.  Are special valve springs, pushrods etc needed?  Any suggestions on cam manufacturer and lift, duration etc?  Are any modifications required in the lifter valley etc?  
> 
> Any and all help would be greatly appreciated.  This is driving me nuts not knowing what's causing the problem.  
> 
> Thanks in advance,
> 
> Steve
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