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The subject of carb spacers has been worked over more than a few times. In reading an article about the EM, I noticed almost all had a very tall spacer on top of intake. Of course these engines are not being put into a car. They also do not want to leave anything on the table.
I wonder if the spacer allows them to tune for more low/mid power and get some top end back w/volume increase from spacer?
Any thoughts from the forum?
For the EMC builds, the builder will play with several intakes, spacers and carbs until he has the best combination. These engines are sold for street use as they are pump gas compression, hydraulic roller and tuned for 3000-6500rpm. The engines are sold at a discount and have a lot of custom tweaks.
Back in the late 70's early 80's the "idea" when stuck with a stock intaker or some cats using divided plenum intakes like the performer would stick an open spacer on there to get a bit more higher end hp, then people would play with spacers with different holes and they gave odd low end torque help, in some cases, I guess this type weekend warrior play wasnt without merrit as we saw outfits like edelbrock do cutting on the divider in the plenum in intake like the performer and rename it perforumer rpm as this killed a little low end and gained a little top end,
So if a person was putzing around old school style and hanging at the local strip trying to shave a 10th off the 1320 time playing with spacers would be a cheap way.
In my case I have a mild 454 lots of low end torque and while I do not want to kill it all with an open plenum intake I very likely will run an open spacer to get the power band up just a hair...