Unfortunately, there's a price to pay for this cooling. Side effects
include: Decreased fuel economy, increased plug and valve fouling, poor
high-altitude performance, an inability to pass a smog check (if so required
by your particular government), to name a few. Still, it may be more
economical than replacing valves and manifolds every few years.
Careful tightening exhaust manifolds, too--Over-torqued nuts or bolts + high
temperature = cracked manifold. Having said that, I feel kind of guilty--I
never have actually pulled out the torque wrench when installing an exhaust
manifold.
Just my 2 cents worth...
Mark Masse
1976 Kaiser M715 W/W
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