SBC Vortec heads

[cecil misner]

So, is it good or bad thinking to install stock Vortec heads on a 406 SBC?

Ceec

[Bill Cleveland]

The stock Vortecs flow great, esp, below 5,500 RPM; the achilles heel for the stockers is the limitations on gross valve lift - no more than .470 with 1.5 ratio rocker arms, but this is fine for most street engines. You can machine the valve guides yourself with a neat little tool sold by Comp Cams, to allow higher lifts and 1.6 ratio rockers. This will give you more HP above 5,500 RPMs, as you move to a bigger cam and stronger springs. The 64 cc combustion chambers on the stock Vortecs will also give you a nice 9.5+ compression ratio with dished pistons, and the price is right! Right out of the box they flow better than the old double hump heads that everyone tries to find.

[cecil misner]

Hi Spanky, This 406 is for my GMC (the one I drove to Hannibal) that I am modernizing. My Bucket Buddy, Fred, from Belfair, WA gave me a complete Vortec 350, the 400, and a Mopar front axle in trade for 2 carburators. I had the pistons and rings on hand for a .030 overbore on the 400. So, I have a 406 short block ready. The 400 heads are to far gone to overhaul. So, I think I'd like to put the Vortec heads on the 400. I can drill the steam holes on my drill press and then a pretty much stock overhaul on the heads. Also, I think the center bolt valve covers look kinda trick.

You say?? Ceec

[Bill Cleveland]

Ceeeeeec - I think you'll love the Vortecs on your 400 block. Just remember, the combustion chambers are 64 cc, and if the pistons are domed at all, you could be at a pretty high compression ratio. Just a thought . . . I say go for it!!

[Bill Cleveland]

Also, be aware that the Vortecs will require a special intake manifold designed to correspond to the Vortec's different bolt pattern/angles. E-bay may help you there.

Or . . . check this out: http://www.summitracing.com/parts/sum-226018/overview/

[cecil misner]

Thanks Bill, The pistons are SpeedPro forged dished.

[Bill Cleveland]

Great! You should get around 9.5:1 compression which should serve you well on a street engine. Let me know how it turns out!

[cecil misner]

I sure will, Spanky! Man-O-Man it is good to chat with you.

[Bill Cleveland]

Likewise, Ceec. I think the last time we were together face-to-face was in Hannibal, MO! Seems like yesterday . . .