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Old 02-14-2013, 05:23 PM
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SBC spread-bore dual plane intake question.

Does anybody make a spread-bore dual plane intake with runners over 2" tall? The crosswind has 2.09" but it's a square bore and I don't have the hood clearance for an adaptor.

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Old 02-14-2013, 09:48 PM
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what do you call a good intake?its a matter of opinion and flow you require
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Old 02-14-2013, 10:54 PM
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Didn't ask which one was better just asked if there was one that had runners taller than than 2.00". I know the RPM intake is about the best but the 1.92" runner isn't a close enough match to my 2.19" head port. I know you need a little smaller intake port to head for reversion but that should be only about .04" if my memory serves me right I haven't built an engine in almost 20 years so I'm having to relearn everything again. I don't know what I was thinking when I decided to buy a project car, at my age this is more work than fun. Heck, in the last 20 years if I had a car that needed tires I'd just buy another car but then again I 've always changed my own oil mainly because I'm cheap! Yes, that doesn't make sense but it's true. Ha! Thanks for your help!
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Old 02-15-2013, 11:19 AM
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I only know of two SBC Dual plane High Rise intakes that have a Qjet spread bore carb flange
One is a Edelbrock Performer RPM Qjet version. The other is a GM/Mercury Marine cast iron manifold.
it is a copy of the good old GM Z/28 -Holley 300-36 dual plane hi rise but is cast iron and has a Qjet spread bore flange. One of these choices is about as close as you will get in a production intake manifold.
that has the Qjet flange.
Port match it and try it. Custom complete hand porting is a lot of work on a dual plane manifold.
requires making some access windows to port and rewelding.

With the popularity of big cid SBC engines 427-434-454CID that can use a big port head there is a market for a Super Performer RPM SBC Dual plane manifold with these larger ports that match the larger head ports of typical 230+cc intake ports.

The wheels turn slow at Edelbrock. Still waiting for a Tunnel Ram for the vortec head.

Last edited by F-BIRD'88; 02-15-2013 at 11:24 AM.
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