hey guys, well i just finished putting in a 1969 327 bored .030 over in my 87 GTA, i used the stock L98 heads and the stock tuned port system, i just added an air foiland an adjustable fuel pressure regulator, any ways i'm getting the headers in a few days and i'm gonna order a Holley stealth ram in the next few weeks. well this is my problem, i'm using a hyraulic cam the specs are 477\480 lift and 268\280 duration with 110 degree lobe seperation its a comp cams 12-242-2 or XE268h-10 and the engine is surging more than it should, and also its eating up gas i'm probably getting around 10 miles to the gallon, i was told i need a custom chip for the tuned port computer. any one who has any idea of what i may need please tell me, or if any one knows a good place to get a chip please tell me also i would like some suggestions on how many psi i should put the regulator to, any with experiance with this kind of swap or anyone who knows anything about tuned ports please help me out.

 

Oh yeah its also running something like 9.25:1 compression

 

This is just a guess, but you might contact Ed Wright at www.fastchip.com and see if they can burn a PROM for your application. I haven't experienced his work firsthand (yet), but he does high-quality work from what I've read on the boards. HTH.

Anyone else who knows that I'm wrong on this, feel free to correct me without flames, please.

- 89_IROC