looking at it right now. Quote from article: (as to why they chose PI heads)
"Some builders swear the non-PI head is every bit as good after porting, but the compression bump was what we were after."
For those of you wondering why they would use stock PI heads over ported non-PI heads, it wasn't for the price. They only used stock PI heads (with other mods) for "stage1 and 2" making 313.6 HP and 315.1 LB-FT. Stage 3 only consisted of swapping to PORTED PI HEADS! with 46mm SI valves bumping power up to 346.1 HP and 341.2 LB-FT. I don't think price was an issue either cuz those ported PI heads cost them $1,199.99!
Brian. 95' Crown Vic, Light Willow Green, only 70,000 miles! Mods: Custom CAI
Custom 2 1/2" dual exhuast w/ x-pipe, Dynomax Ultra Flows 3.5" tips; J-mod,
PI Front Sway Bar, MM Rear Sway Bar w/ ENS Poly Rear Kit, 17x8 & 17x10.5 Bullitts,
3.55's & t-lok 24 inches of traction
P&P Plenum and TB, Boxed Control Arms
Gatorback Poly-V Belt 9006 Sylvania Silverstar Ultras.