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What is the deal with running a phenolic or similar spacer? I get the heat soak side and understand changing the volume of the intake changes torque etc but whats the best for a mild 383 street car. cheers..
What is the deal with running a phenolic or similar spacer? I get the heat soak side and understand changing the volume of the intake changes torque etc but whats the best for a mild 383 street car. cheers.. A phenolic will pull heat away from your carb better than a aluminum spacer but a wood spacer will be much more efficient . Now since you didn't mention what type of spacer you're wanting or type of intake (single plane or dual plane ) I can't recommend one without more info But I can give you examples of what each spacer design and spacer height can do Open hole .... Basically an open hole will increase plenum volume which makes more hp plus increases overall engines max rpm Reduces low end torque Spacer thickness is also a good tuning tool this can be helpful for track conditions especially on a dry slick track . Depending on thickness you can adjust your engines low end torque . So if you are wanting to slightly reduce low end torque you would go with a 1" open hole and if you want to drastically reduce low end tq then that would be a 2" open hole Increases overall rpm .... usually a 1" spacer will add about 1k more rpm So going smaller like a 1/2" or going as big as 2" you can adjust for track conditions or weather conditions depending on where you want your useable rpm at . I've even seen some drag racers running 2" spacers on tall intakes just to get more plenum volume /rpm range 4 hole spacers ... Increases carb signal strength Increases air flow velocity Enhances low rpm throttle response Increases or decreases engines overall torque range Depending on spacer thickness Also an engine with to small of carb or small cams ( duration / lift or specs @ .050 ) a 4 hole spacer can increase hp / tq #'s One of the best carb spacer manufacturers which is ( Wilson manifolds ) makes some very good spacers . They're on the $$$ side but well worth it . Alot of engine builders use their spacers and Wilson Manifolds has an awesome tech dept that can help you in determining the best suggestion for a spacer Last edited: Oct 25, 2015
A phenolic will pull heat away from your carb better than a aluminum spacer but a wood spacer will be much more efficient . what it does is reduce the amount of heat transferred from a hot intake to the carb...
a phenolic spacer doesn't pull heat away from the carb...a phenolic spacer isn't a heat sink... what it does is reduce the amount of heat transferred from a hot intake to the carb... It was 0300hrs when I was typing this on my stupid phone . Meant to say that a phenolic spacer is better than
aluminum in keeping heat from the carb !!!!!! . But the wood spacer was even better in keeping heat away from the carb Last edited: Oct 25, 2015
. I run a 1/2" wood spacer on everything I own. The thing to remember with any spacer, every combo is different. .
All this talk about spacers has me interested in trying a Wilson 2" tapered spacer . They , Wilson say up to 30 more hp and crisper throttle response by installing this spacer . Also looking at the HVC Super Sucker 2" spacer has my interest as well I'm running a 2" tall Mr Gasket aluminum spacer on top my Holley Strip Dominator intake right now and have been since 2009 and runs very well with great throttle response
Last edited: Oct 25, 2015
Thanks for the info and link i will go through it. fyi
Are 2 inch carb spacers better than 1 inch?5-inch open spacer, but a 1-inch spacer cut output, especially midrange torque. On the 350, best results were found with a 2-inch spacer. Its use produced up to 6 more horsepower at peak and as much as 14 more at 750 rpm over peak power. On the 400-inch engine, a stack of three 1-inch spacers produced the best results.
What does a 2 inch carb spacer do?A carb spacer increases the distance between the intake manifold and the bottom of the carburetor, which reduces the velocity of the intake charge. A four-hole spacer helps to direct the air-fuel mixture, making the streams more efficient.
What does a 1 inch carb spacer do?A carb spacer gives your manifold a longer neck. And this increases the volume of your intake's plenum and runner, as well as the total distance between the bottom of the manifold and the bottom of the carburetor. These increases create the space needed for the intake mixture to straighten out.
What is better 4 hole or open carb spacer?4-Hole tapered spacers are the go-to unless the spacer is going under an elbow. Open spacers only improve plenum volume, but won't pick up the CFM of the carburetor or throttle body the way the 4-hole tapered spacer does.
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