Intake Spacers?
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Junior User
Joined: Jan 2006
Posts: 93
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From: Medford, Oregon
Intake Spacers?
Does anyone use intake manifold spacers on their carbed engines? I am looking at puting one on and I wanted to find out what people have experienced with them. Does anyone have any comments about them? Thanks
Moderator
Joined: Jan 2001
Posts: 56,984
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From: Virginia
Not very good for a heavy 4x4 truck with large tires. With the spacer you are increasing the volume of the manifold for higher rpm power. It can hurt your low end throttle response.
Now if you have a lightweight vehicle with a high ratio rear, then it may help a little.
Now if you have a lightweight vehicle with a high ratio rear, then it may help a little.
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
As stated above, he was speaking about a open spacer, a 4 hole will be the opposite and help low end plus give the carb a stronger vacuum signal at a slight loss at top end. To see or feel the difference you have to go in 1" steps like try 1" then go to a 2" spacer if hood clearance allows. Make sure the spacer if 4 hole matches the diameter of the throttle plate bores, not smaller or larger. Most spacers will not match the carb throttle bore.
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
On the 1" Moroso 4 hole spacer the bores are 1.715" up top and 1.725" at the bottom, I believe for mold release. The bore on a 670 Holley SA carb is 1.562" (1.687" for a 770 SA), the spacer is .153" larger than the carb. On a Performer intake there was little difference in low end with this spacer added. With a 2" thick spacer that started out smaller than the carb bores then milled out to 1.562" to match the 670 there was a noticeable low end increase. Far as the upper rpm's loss anything over 5,000 with a torque built 414 it's already beyond its normal operating range anyway.
With the above Moroso 1" spacer and a 770 SA, the spacer is larger than the carb by only .027".
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With the above Moroso 1" spacer and a 770 SA, the spacer is larger than the carb by only .027".
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Last edited by "Beemer Nut"; Apr 12, 2006 at 05:08 PM.
Post Fiend
Joined: Oct 2003
Posts: 9,176
Likes: 4
From: Western Central NV
I have a 1" Torq-Swirl adapter on a Edelbrock Performer Manifold on to a stock 460, with a 4160, 600 CFM, Holley carb. I'm not sure I notice any difference. The BIG difference for this engine came when I installed a Cloyes Street Roller Timing Chain Set and advanced the timing at the cam 4 degrees beyond TDC.
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Senior User
Joined: Oct 2005
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I run 2 inch ported (4 hole) spacers on cast iron intakes, nothing but a good insulating gasket on aluminum intakes. Best set ups for me, in my trucks.
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