305 vortec heads

Adger Smith · 04-17-2008, 06:25 AM

I have a 305 head combo I've been using on some circle track limited engines. Better check the out side water passages (spark plug side) & the fire ring of the gasket. A lot of these heads are cast where the fire ring of the 350 bore gasket hangs over, or almost into, the water passage & leaks. Otherwise they will work. I do hope you mean the head WITHOUT the swirl ramp under the intake valve. That is a true Vortec. You are wasting your time using the heads with the swirl ramps. They quit flowing @ around .425 lift. They are great for what they are designed, low end power in trucks & cars. Max swirl. You will never be able to run them on a 350 with pump gas. About 11-1. I always do an unshroud on the valve pockets to pick up the flow & they end up around 66-68 cc. The flow is worth more than the compression.

04-17-2008, 06:25 AM	#6
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: 305 vortec heads I have a 305 head combo I've been using on some circle track limited engines. Better check the out side water passages (spark plug side) & the fire ring of the gasket. A lot of these heads are cast where the fire ring of the 350 bore gasket hangs over, or almost into, the water passage & leaks. Otherwise they will work. I do hope you mean the head WITHOUT the swirl ramp under the intake valve. That is a true Vortec. You are wasting your time using the heads with the swirl ramps. They quit flowing @ around .425 lift. They are great for what they are designed, low end power in trucks & cars. Max swirl. You will never be able to run them on a 350 with pump gas. About 11-1. I always do an unshroud on the valve pockets to pick up the flow & they end up around 66-68 cc. The flow is worth more than the compression. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 04-17-2008 at 06:27 AM. Reason: sp