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Old 01-03-2011, 11:23 PM   #1 (permalink)
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Cylinder Head Porting

Why don't I see much if any of this being done? I see guys pulling heads to o-ring and install studs to put more boost to it, so why not get the head ported? I searched and came up empty with what people have seen with results from this. No one seems to do it. Companies sell this service. What gives?
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Old 01-03-2011, 11:30 PM   #2 (permalink)
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I might give it a shot. Heads sitting on a work bench, might as well do it.
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Old 01-04-2011, 12:03 AM   #3 (permalink)
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A buddy of mine got his ported and polished. Not sure if it made a lot of difference tho.
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Old 01-04-2011, 01:11 AM   #4 (permalink)
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curious as well. I think i read somewhere that it is not beneficial on the 12v until extremely high horsepower goals like. . . but that may have been something else. I agree, a lot of people seem not to do it and I have wondered why as well.
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Old 01-04-2011, 02:13 AM   #5 (permalink)
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Here's a couple for you....

cnc head porting

Port polish head
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Old 01-04-2011, 07:29 AM   #6 (permalink)
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Mines done. Boost is down and egts are down. I don't see why you wouldn't do it if you had a chance.
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Old 01-04-2011, 12:59 PM   #7 (permalink)
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Higher boost and lower egts is what i would want.
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Old 01-04-2011, 01:42 PM   #8 (permalink)
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Higher boost and lower egts is what i would want.
Remembering that "Boost" is a measure of resistance to flow through the engine, changing nothing else, porting a head will reduce the resistance to flow thus appearing to drop the original boost number. Of course, EGTs will also drop with increased flow.
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Old 01-04-2011, 04:33 PM   #9 (permalink)
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Hey BC, how you doing?

The head on my truck is ported as is the 3 piece manifold. There are major differences at the exhaust posts between the exhaust ports on the motor and the ports on the manifolds. The manifold was was port matched but the head got pretty much the full porting. It was done by PDR up in Vancouver B.C. when Piers was still the owner. Some of the older guys might still recognize that name but not sure about the newer members.

Like BC said, anytime you reduced the pressure loss thru the engine, more air can be stuffed into it. On the intake side of a first gen there are a few areas in the plenum area that are really restrictive. Smoothing these up helps the air to get to the valves.

Porting around the base of the turbos also helps.
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93 D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust, modified tranny, EGT/boost/tranny/tach gauges, TPS removed, a little chrome under the hood. Mag-Hitec tranny and diff. covers. Rear sway bar. Line-x bed liner, after market seats. Single stage Water/Meth system installed. Oversized intercooler w/3" IC lines.

05 Chevy 2500 HDcrew cab 4x4, Duramax W/Allison, 17" Hummer wheels w/285-70-17 BFG's, Banks intake, ported turbo mouthpiece. Predator programmer, Autometer EGT and boost gauges.
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Old 01-04-2011, 05:21 PM   #10 (permalink)
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Hey BC, how you doing?
Hey Stan, happy new year.

Like Stan, I've a ported head from PDR: 195 CFM in, 220 CFM out (stock is 145 in and 153 out). The head combined with a good flowing cam, intercooler and associated plumbing (including the stock/OEM intake feed-horn ) results in a LOT more flow through the engine.

As folks have pointed out, there's a number of areas in the 12v head that could be improved. Here's an old image from the PDR website talking about the exhaust ports . . .




The #1 intake port has a nice bolt boss cast into the beginning of it's runner in the intake log . . . .






Nowadays, with the funding for it, folks have taken to cutting the stock/OEM cast intake-log from the head so as to have full access to the intake runners for porting. Then bolt a high-dollar custom built intake-log in it's place.

Here's a Hellman model . . .

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Old 01-04-2011, 05:34 PM   #11 (permalink)
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Dave,
Did you get the stage two head or the stage three?

I had the PDR towing cam installed but wish I had just left the stock cam in place. Really didn't see a lot of improvement with the cam for all around driving but it did help with the towing. The power band was a lot wider. At the same time the 60# springs went in and that is something that should be considered a must if the power is going to be turned up very much.

I had the head and cam done first then took the truck up to PDR and they put the twins on. Was one of the first ones they did. Also had the 4" exhaust put on with the twins.

I'm going to be selling my truck in the near future and someone will get a good deal as I still have most of the stock components that came off as well as a pile of parts.
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93 D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust, modified tranny, EGT/boost/tranny/tach gauges, TPS removed, a little chrome under the hood. Mag-Hitec tranny and diff. covers. Rear sway bar. Line-x bed liner, after market seats. Single stage Water/Meth system installed. Oversized intercooler w/3" IC lines.

05 Chevy 2500 HDcrew cab 4x4, Duramax W/Allison, 17" Hummer wheels w/285-70-17 BFG's, Banks intake, ported turbo mouthpiece. Predator programmer, Autometer EGT and boost gauges.
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Old 01-04-2011, 05:47 PM   #12 (permalink)
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I won't go that far, but definatly clean everything up where I can get.

Also the only reason you would way higher boost is to help keep EGT's down. Porting will help keep EGT's down while lower boost a little, which is actually easier on your engine. That's the way I think about it.
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