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**truckster** · 08-06-2014, 08:28 PM

Vortec heads will work fine on the 400 SB. You'll need to drill steam holes, but you can use the head gasket as a guide for those.

Your HP/torque goals should be easy with that combination. You'll need a manifold that fits the Vortec heads. Edelbrock makes a Performer for that application. A Quadrajet would be a great carb to have on that as well. The 400 is also externally balanced, so you'll need a different balancer/flex plate.

One thing about the 400 - make sure your cooling system is up to snuff.

You'll love the 400 in your truck.

08-06-2014, 08:28 PM	#3
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,822	Re: 400 in the 68 Chevy Vortec heads will work fine on the 400 SB. You'll need to drill steam holes, but you can use the head gasket as a guide for those. Your HP/torque goals should be easy with that combination. You'll need a manifold that fits the Vortec heads. Edelbrock makes a Performer for that application. A Quadrajet would be a great carb to have on that as well. The 400 is also externally balanced, so you'll need a different balancer/flex plate. One thing about the 400 - make sure your cooling system is up to snuff. You'll love the 400 in your truck.