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Old 08-29-2009, 10:25 PM
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Can anyone identify this head casting symbol?

On my buddy's 400. They have center bolt valve covers.


Last edited by elano; 08-30-2009 at 02:21 AM.
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Old 08-30-2009, 01:20 AM
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They appear to be late 80`s swirl port smogger heads. However, I would pop the valve cover and get the casting numbers, you only need the last 3 numbers, you can look up what they are here:
http://www.mortec.com/castnum.htm
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Old 08-30-2009, 12:46 PM
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This is my buddy's car, he won't let me pull a valve cover. I'm trying to see what he's got.
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Old 08-30-2009, 12:51 PM
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They appear to be 193 castings which are swirl port heads. These are the poorest flowing SBC heads ever made.
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Old 08-30-2009, 03:30 PM
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Easiest way to tell:

If you have 12 intake bolts and they all go straight into the head, its a one-year-only 1986 head that was pretty low-flow. If the center four bolts on the intake are at a different angle than the rest, its a TBI swirl port head and its (no offense) pathetic for anything other than a stock 305 or 350 that only needs to rev to 4500 at most. Supplying a 400 with those little restrictive ports probably limits the power potential to about 3900 rpms.... which is fine if that's his goal.

If the intake has only 8 bolts and they all point straight down toward the ground, its a Vortec head and its the single best-flowing factory production head that chevy ever made for the small block and it should support that 400 to about 5000 RPM with great power and torque potential.
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Old 08-30-2009, 03:52 PM
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As DV, said looks like 193 castings.

sam-missle
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Old 09-01-2009, 10:34 AM
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Thank you all for the help!!!

The center two intake bolts are at a slightly different angle pointing more towards the ground than the rest. Guess this guy has a really mismatched combo...

Isky 201304 (304/.525)
Weiand Stealth intake
Holley 770 street avenger
And these piece of junk heads.

Preciate it yall.
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