Flow Testing

MORE FLOW=MORE GO!

Well, in most cases. The general school of thought on cylinder head and intake manifold porting is that bigger is better. Many machinists will simply enlarge and finish the ports and proclaim an estimated increase in flow and horsepower. This doesn't always work. We've tested heads reworked by others and found that in many cases they flow WORSE THAN A STOCK HEAD!!!

Our porting R & D is done on a flow bench, providing real numbers to support our machining. Flow testing is done with the valves installed to the specified lift the cam will provide. The effectiveness of valve angles and valve guide modifications is also verified.

There are limits to how much material can be removed from a given intake or exhaust port. If you get the walls too thin, you run a serious risk of causing a crack or "mysterious" coolant loss. We find the most direct way of determining safe limits is to cut a sample cylinder head into pieces. Expensive, but very educational. (They make great paperweights, too!)

Other considerations are the taper and finish of the port. Incorrect taper will slow the velocity of the incoming charge, reducing cylinder filling and costing power. Improper finish of the intake ports will cause fuel to pool, resulting in poor idle and warm up running.

We offer cylinder head and intake porting not only in our own rebuilds, but also for the DIYer who prefers to assemble his own engine. Either way, you are assured of an effective, durable job which will help you extract the most power out of your engine.

In some instances, the shape of intake and exhaust manifolds prohibits a thorough porting using convential methods (ie: small six and V-12 intakes). In these cases we utilize Extrude Hone to accomplish the desired result. Our volume with this company allows us to offer you excellent pricing on this premium service.