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03-29-2003, 06:06 PM
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#1 |
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Registered Member
Join Date: Feb 2003
Location: Seattle, Wa.
Posts: 175
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The only time that is true is if you have a 1986 5.0. The 86 5.0 had NO valve reliefs at all. 87 and up come with a valve relief already, not much of one but enough. I have installed AFR 205, Edelbrock Perf. RPM, Trick Flow Twisted Wedge, Holley Systemax, Ford Motorsport X and Y heads, Dart heads ALL on stock short block 5.0's of 87' vintage or newer, and with a variety of cam's that as long as the duration @ .050 is NO MORE than 230 degree's then you WILL NOT have a problem! Period! You see with the shorter duration cams (less that 230 deg.) the valve is simply NOT OPEN anywhere near the piston during operation. At least not near enough to be a problem on a Hyd. Roller engine that does not see over 6,300 rpm.
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