First Post.. 2x4 intake ??

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Jan 30, 2006 | 04:30 PM

BOSSv10

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First Post.. 2x4 intake ??

I picked up a 460 out of a '92 F-250. I am switching to carbs. My question is does anyone have a 2x4 blue thunder intake on their engine and how are its manners compared to just a 4 barrel. I am putting it into a '72 torino and am worried about hood clearance.

Jan 31, 2006 | 01:45 AM

Bear 45/70

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You are aware that the carb manifold will not fit the EFI heads?

Jan 31, 2006 | 08:39 AM

BOSSv10

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I am planning on bolting on a pair of CJ heads from Ford.

Jan 31, 2006 | 11:00 AM

ivanribic

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I'm not running one, I've done a little research on them though. They don't seem to perform quite as well as they're made out to. They'd be nice for the bling factor but if they're not really improving overall power then why would you want an intake that costs double the price, will require 2 carbs and will be a lot harder to tune? I'd much rather go for a good dual plane single carb intake like the Stealth, but that's just my opinion.

Jan 31, 2006 | 11:42 AM

Brad Johnson

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Hmmmm... a pair of SCJ Ford heads on a late model block should get you a respectable (not to mention very streetable) mid-9's compression ratio. As for the intake, it's going to be more a matter of carb selection and tuning than the actual intake. A set of small 4v's, properly tuned, should have pretty decent street manners. You would probably get a little better low-end response with a single 4v intake, but in choosing the 2x4 config I take it you are going more for wow factor.

Brad

Jan 31, 2006 | 01:34 PM

Bear 45/70

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Quote:

Originally Posted by Brad Johnson

I agree with Brad. For a street motor you want to keep the carbs small, 390 to 450 CFM and vacuum secondaries (tie the vacuum units together like the old 427 2X4s did so they open at the same time and rate). A pair of 500 CFM carbs would take you to 7000 RPM for street use and I hope you don't buzz it that high.

Jan 31, 2006 | 06:00 PM

BOSSv10

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yeah it was more for wow factor than performance. So from what I am reading a dual plane 4 barrel will be a little tamer and probrably better for my application. Another thing that I was wondering is does anyone know the stock horsepower/torque numbers for this motor. I want to try to get 450-500 horse out of it. Thanks for the help.

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Feb 1, 2006 | 11:22 AM

Brad Johnson

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With the SCJ heads you should have zero problem hitting 500 hp. Keep in mind that these heads are designed more for mid-range to upper RPM hp. When making your cam selection try and pick one that will have a powerband beginning around 2000 RPM and topping out around 5500. That's about all the stock bottom end will take reliably.

If you are willing to pop for the heads you might want to investigate going with a full roller cam setup to take full advantage of the power potential these heads have. A roller will maximize the powerband to give you the most low-end and still keep good redline power. It will also minimize parasitic power losses. Going full roller in the valvetrain also sets you up for any later builds when you might want to expand your RPM horizons a bit.

The Crane 325-2S-14 (p/n 359351) seems tailor made for your current proposal. Advertised powerband is 2500-6000 RPM. Desktop Dyno echos this, giving 526 hp @ 5500. Better yet is the dead-flat (and very healthy!) 600 lb-ft torque line from just under 2000 to just over 4000 RPM. It's still making over 550 lb-ft at 5000! The powerband is perfect for a street rod and just within the limits of your stock bottom end.

Brad

Last edited by Brad Johnson; Feb 1, 2006 at 11:33 AM.