Reply to "New Engine/Low HP"

> I have checked the gap of the plugs, they are .045+, and a little oily where
> they seat in the block.

Gap a new set to 0.035". If your ignition is marginal, the narrower gap will
allow it to hang in longer.

> The dyno sheet shows HP dropping off dramatically at about 5650,
> I'll try to attach a copy of the sheet.

The slope of the curve indicates the engine is nout running out of the
basics. If the heads or intake or carb were choking it off, it would
flatten out more gradually. It looks more like something was unable to
keep up with the RPM.

1. You may have ran out of fuel. Put a gauge on it and make sure the
pressure isn't dropping off at RPM.

2. You may have ran out of spark. Tougher to daignose but a narrow gap
may allow some additional RPM before it nose dives.

3. The hydraulic roller lifter and spring combo hit its limit. Given
the weight of the 4V valves, the lifters and springs you are using this
is a real possiility. Get a look at the article "The Truth about Street
Cams" by David Vizard September 2005 Popular Hot Rodding. It has test
data on hydraulic roller cams doing what your engine appears to be doing.
The fix was Crane link bar lifters and beehive valve springs.

Dan Jones