how to clean heads good after porting??

Yea nice job, I always take pride when I can say I did everything myself.....I always use Simple green and a brush when I clean mine of grease and grime and rinse it out with a hose , but a pressure washer would prob be a real good idea, or a Steam Jennie if u have access to one and a parts washer like someone mentioned. then blow everything dry with an air gun. Make sure u look through all the valve guides and such with a flashlight and make sure theres no filings or burrs. BTW i think they make a little brush to clean out the guides with. and chasing all the threads with a tap would be a good idea too

Make sure you dont get them baby's ass smooth, you want them somewhat rough to keep the fuel atomized in the air. Im sure you know what your doing, tips always help though. and port matching the exhaust to the head can be bad sometimes, because of exhuast reversion, in which the exhaust gas is pushed into the header tube its compressed into a small space. There are two directions it can travel, back into the port and down the header tube. Usually you want a slightly larger diameter header tube than the port to help focus it down the tube instead of backing it into the port. Of course you should have no poblem with this. My dad is wearing off on me, sheesh. Just wash them, blow them dry about four times and go over them with a fine tooth comb after each washing. Tap all threads, check the water jackets. I actually put little pieces of duck tape over the water holes when i ported my heads, helped alot.
Oh and after i washed them in tranny fluid, i dried them off with air and then sprayed some spray can oil on just about every square inch and then blew them dry. I found that the oil helped the fillings stick together and helped clear them easier. Just a tip...

Oh and i found these on a website about Reher-Morrison, its an engine builder school in Texas, hope these help you some;


Why Rough-Finished Ports Work

The port surface found in a Reher-Morrison race cylinder head features a definitive texture. It’s difficult to describe, but here’s a good analogy: Think of it as a miniature culvert. A series of visually detectable grooves follow the shape of the port. The grooves aren’t the result of sloppy workmanship. On the contrary, a good amount of work goes into to creating the surface finish. Why? The answer is simple: The flow quality improves.

The bowl of the cylinder head is the area of the port immediately behind the valve head. The bowls in most cylinder heads are bored with a vertical mill. Typically, this leaves a sharp transition to the balance of the port, which in turn can create turbulence and port restrictions. Reher-Morrison explains that modifications to the bowl area of a cylinder head can contribute to as much as 35 percent of the total flow of the port.

88Stangboy said:

Make sure you dont get them baby's ass smooth, you want them somewhat rough to keep the fuel atomized in the air.

Click to expand...

Then why is there port and polish? or does that only happen on upper intakes (before fuel is introduced)? and how does that slight roughness help?

whoops didnt see your other post, sry.

If the port is to smooth, the fuel actually groups together into little droplets and droplets dont burn as well as fully atomized fuel. The slight roughness actually creates a small amount of turbulance that helps mix the fuel and air better. You want a dullish finish to the ports, and you want the port to taper slightly from the mouth of the intake torwards the bowl, you want it to taper slightly, not a huge difference, air doesn't like to turn, or go from a wide space to a narrow area. Everything must be nice and rounded and slightly scuffed up, use some scotch pads to put a finish on the ports. Plus you want to knock any sharp edges down. In the combustion chambers you want to smooth the sharp edges also, sharp edges can cause detonation (Dont take alot out, just smooth and be done in the combustion chambers, taking to much out will lower compression.) Just remember, air doesn't like to turn abruptly, think of it as a narrow, back country road and trying to drive, you have to constantly turn and this makes you slow down, now think about the highway how the turns are nice and gradual and gently, you can travel faster. Same thing with air in ports.

^^^ well put