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04-27-2010, 02:00 PM
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#1 |
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Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Vortec heads on a 400 sbc question
I was wondering if i could run Vortec heads on my 400 sbc and what would need to be done to them to make them work? I was wondering if there were any desired cars to look for them in or casting numbers?
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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04-27-2010, 02:27 PM
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#2 |
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Registered User
Join Date: Apr 2008
Location: Imperial Beach, CA
Posts: 1,040
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Re: Vortec heads on a 400 sbc question
Most 350 heads will fit just need to mark out and drill the steam holes. The combustion chamber may cause compression problems depending on piston.
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69 c-10 BBC  462ci, forged crank, H-beam rods, 10.5-1 KB forged pistons, Dart Iron Eagle 308cc, Straub Cam, Comp Cams chrome moly full rollers, Weiand Team G, Prosystems 950, TH400/3500 Dalenzie stall, Currie 9+ Detroit Locker w/31spline axles.  3.5/6in drop. My Build.
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04-27-2010, 03:47 PM
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#3 |
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Account Suspended
Join Date: Oct 2009
Location: Sammamish, WA
Posts: 2,404
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Re: Vortec heads on a 400 sbc question
With 170cc intake runners, Vortecs are a bit small for a performance 400 - if you're turning past 5000 RPM or have a sizeable cam, you're leaving power on the table.
Remember that stock Vortecs are lift-limited to .475. It's possible to upgrade the springs, but the heads don't flow past .475 so it's not worth it. |
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04-28-2010, 11:43 AM
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#4 |
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Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: Vortec heads on a 400 sbc question
my cam is .442 lift so i dnt think that will be a problem. i was just wondering if they would be better than the stock heads that came on a 400. this isnt a performance motor and will be used for pulllin trailers and as a DD.
__________________
68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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04-28-2010, 11:59 AM
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#5 |
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Account Suspended
Join Date: Oct 2009
Location: Sammamish, WA
Posts: 2,404
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Re: Vortec heads on a 400 sbc question
The Vortecs flow better, and have a far better chamber...but I'd put the power increase with a mild cam on a 400 at maybe 20 HP/TQ or so.
If you've done everything else (intake/carb/headers/exhaust/timing/tune) then it might be worthwile...but if it was me, I'd probably pass. |
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