After the upgrade.....

[fastback4]

After head gasket failure and over heating the engine last December in my 1997 3100 Monte, I decided to upgrade to newer 3400 heads, intake manifolds, injectors and throttle body and have finally finished this project last Sunday. I'm a little disappointed in the 0-60 mph performance results but the top end has improved. By this top end improvement i mean the throttle has a lot of pedal left on it in the 85-95 MPH range. I should see a MPG improvment overall. The engine idles a little high at 1,000 rpm in "N" and 900 rpm in "D", or at least that seems high to me. Is there a reason that the bottom end is not as snappy and responsive as it was in stock configuration?.........Tom

[ssdurango]

opening up the intake paths can ruduce air velocity and cylinder filling at lower rpms.

[pocket-rocket]

Not being tuned could be a big part of it as well.

[fastback4]

Ok. I forgot to mention I'm running EGR valve delete. I know it's prob not wise but it's what i got for now. Could i get another feedback on this thread please. Where would i go to get re tuned. I have no tuner in my possession.......Tom

[mickaz]

there is a dhp powrtuner for sale right now on the the (for Sale section) . that should give you a good start on tuning. the rest is mostly reading.