Porting Swirl Port TBI heads. This is a pair of 193s from a 350, but the 191s and 187s are similar. The 191 are from a heavy duty 350 and come with a 76 CC chamber. The 193s are from a Light duty 350 and come with a 64 CC chamber. The 187s come off of a 305 and have a 58 cc chamber. Both 350 heads have 1.94" intake valves and 1.5" exhaust valves. The 305 version uses a 1.84" intake valve and a 1.5" exhaust valve. The intake and exhaust ports are identical between all the heads.
See what happens when you have spare time, you start mocking stuff up. That is a 350 block, angle plug dart iron eagle 215s and stock GM cast iron manifolds. On top is a performer RPM by edelbrock, a Holley Projection Adapter, a cheap spectre chrome 14x 3 air cleaner, s spectre 1" plastic riser, and a Stock Van TBI unit. Guess what it fits. Maybe I should ditch the 305, build a 350, and use the cast iron manifolds. Actually I am doing about that, except toss in a 400 stroke crank.
BBC TBI unit 670 cfm @ 1.5 in/hg vacuum.
