Going to block off the crossovers on the manifold.
Arch,
The exhaust crossover works for & against you. On one hand, because
of the low profile of the intake manifold, the fuel/air mixture has to
take a pretty hard turn at the bottom of the plenum to get into the
runners, some puddling occurs at this point and the heated floor of the
intake is designed to re-vaporize (for lack of a better term) this
puddled fuel. On the other hand, it raises the temp of the incoming
charge lowering the air/fuel mixture density which, as we know, is
detrimental to performance. It also retains heat after shut down which
tends to perk off fuel in the float bowl making it hard to restart the
engine. Tough call. Maybe consider an insulating gasket in conjunction
with a heat shield and one of Darrens raised access covers to make up
for the additional height. GM used this on several high performance
applications. Also, use stainless steel block-off plates if you opt to
do this as the steel ones go away very quickly.
Steve Ferguson
San Diego
Arch,
The exhaust crossover works for & against you. On one hand, because
of the low profile of the intake manifold, the fuel/air mixture has to
take a pretty hard turn at the bottom of the plenum to get into the
runners, some puddling occurs at this point and the heated floor of the
intake is designed to re-vaporize (for lack of a better term) this
puddled fuel. On the other hand, it raises the temp of the incoming
charge lowering the air/fuel mixture density which, as we know, is
detrimental to performance. It also retains heat after shut down which
tends to perk off fuel in the float bowl making it hard to restart the
engine. Tough call. Maybe consider an insulating gasket in conjunction
with a heat shield and one of Darrens raised access covers to make up
for the additional height. GM used this on several high performance
applications. Also, use stainless steel block-off plates if you opt to
do this as the steel ones go away very quickly.
Steve Ferguson
San Diego
