340 Engine, rebuilt .030 over, 9.5:1 C.R, J heads with 2.02 intakes added,(ported Intake bowls only for the 2.02, untouched exhaust) stock Intake Manifold and Thermobog,
used the small Comp "Thumpr" Cam at the Customers request, he wanted the sound. (NOT our first choice obviously). I don't like cams selected on an exhaust "sound" basis.
Little bit shocked on the Dyno ?
The little wee-40 very quickly spit out just over 400hp with the Dyno headers !
Stupidly,
we never did put the stock exhaust manifolds on, to see the difference in power ?
Far too busy,
trying to appear "all knowing" for the Customer, like we knew it would do that ?
NOT !!
Long story short,
I have some new found respect for the Thumpr Cams ?
That,
or maybe because we ported the Intake Bowls ONLY when adding the 2.02 valves, that,
increased the flow ratio difference, in effect making the 14* exhaust duration difference more "required", due to the increased Intake flow ?
I DUNNO ?
Since then, I have been for a ride in the car with the engine installed with manifolds.
That little fawker does VERY WELL !
Sounds ok too !