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Old 04-03-2007, 11:12 AM
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vortec heads??

I'm hoping somebody out there can help with a vortec head question. I can get a deal on some heads(SBC Vortec heads #12558062...1996-up...350...."Vortec 5700", "L31", 64cc chamber, 170cc intake port, 1.94"/1.5" valves) will these work with my 72 400 block as a step up as I put together some cash for a total build up with alum aftermarket heads.

thanks, street
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Old 04-03-2007, 11:17 AM
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Depends on how much you want to upgrade. Let us know your target RPM, hp, what kind of car, used where, etc.

Vortecs are the best-flowing production head. A street 400 would be perfect for vortecs. An all-out race 400 might enjoy more flow than the vortecs offer.
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Old 04-03-2007, 12:25 PM
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They will work very well on a 400 SBC.
They will need a performance hyd cam like the Comp XE274H or XE284H . Will need the valve guide tops shortened for high lift clearance, inner valve springs boss diam reduced to fit a performacne spring and either drill and pin the rocker studs or remove and machine for screw in studs. With No guide plates use 87+ self aligning style rockers. Or with guide plates installed use '55 to '86 style non guided rockers.
You also must drill the decks for the extra coolant steam holes that a 400 block has in the decks and use a 400 head gasket.

At this preperation level, with a cam as above they are good for 425 to 440hp on a 400 with a ton of torque.
The Xe284H cam needs a 3000 stall converter but makes a little more power than the XE274H overall.
Great power to 6000rpm.
The Professional Products "Crosswind" VORTEC manifold works very well all around.
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Old 04-03-2007, 01:07 PM
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Vortec heads on 400 sbc

There are now Bowtie vortec heads available that offer additional performance
potential and (I believe) come already set up for high lift cams and have screw in studs (a must for aftermarket cams w/vortecs) .... come in 170 cc and a larger (200 ? ) size as well ..... I'm not where I can access the literature I had on them . Available via Scoggins Dickey and other performance chevy. dealers .... also available for high lift via SUMMIT , pn:NAL-VORTECZZ5 (set up for 7/16 studs and guideplates but don't include.)
and will handle up to .550 lift @ $780.00 pair.
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Old 04-03-2007, 01:20 PM
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Are you referring to these?

http://www.jegs.com/webapp/wcs/store...57456_-1_10187
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Old 04-03-2007, 01:44 PM
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if you want to run vortecs on a 400 drill steam holes in heads and then you need to do what's required and recommended in this link to run the heads http://www.2quicknovas.com/vortecheads.html









Mustangsaly
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Old 04-03-2007, 01:49 PM
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Quote:
Originally Posted by DeathRattle

Those are the BOWTIE units I was mentioning.
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Old 04-03-2007, 07:22 PM
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agree with f bird.

i would step down to the xe 268, and keep it under 5500rpm. great muscle car workhorse engine.
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Old 04-04-2007, 09:33 AM
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Vortec heads on 400 sbc

This Nova is primarily a street / daily driver I'm assuming .... The thing to
keep in mind (beside not going broke building it) is to not go overboard with
the cam/heads/converter/rear gear selection. The vortecs with a moderate
cam (the 268 or 274 would be excellent) say a 750 cfm carb on a good intake (AIR gap performer RMP or similar) the best set of headers and "true" dual exhaust w/crossover you can set up for moderate bucks, and a converter and gears (2600-2800 rpm - ballpark ; 3.42 - 3.73 posi-rear will be a must) ..... a combo like this will produce a ton of torque AND excellent driveability, a sure recipe for fun on a daily basis. One of the things I shoot for in a street car is 12/20; twelve second 1/4 mile with 20 miles per gallon ...
it keeps you "honest" with your build and gives you an end product that's real world friendly ....
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