Join Date: Nov 2005
Thanked 261 Times in 125 Posts
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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.
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.