Price listed is for Level 3 full porting and polishing of a TPI base to match or exceed the aftermarket Accel or Edelbrock TPI bases

In 1985 the factory TPI base was designed for a 305 and 305 heads, this is the SAME intake used on all 85-92 tuned port injections.  All 350 TPI L98's from 85-92 with 128, 113, or 083 heads are 1204 ports or 1.98 x 1.22 length x width.  The factory TPI base ports are much smaller, this is one of the reasons why the TPI on 350 L98s don't produce much power and fall flat.  This port job not only is gasket matched to the head but the WHOLE port is reworked, it is now much taller to allow a better angle into the head the side angles are also changed making it much more straight.  The entries where the runners bolt to are very small and poorly contoured from the factory this port job opens them up to the 146 large tube runner gasket not even the aftermarket Edelbrock base is matched like this, the WHOLE runner maintains this size as seen in the pics above.  ALOT of material gets removed with this processes almost 3 lbs of aluminum is removed from the intake's total weight.  Can port to your desire, standard size is 1204 to the head and 1.66 on the runner entries, can go to as big as 1205 without welding.

    

Stock TPI base flows 210cfm

Ported Stock base flows 265+cfm

 

We also port the stock TPI plenums and runners for additional flow and an additional 10ft lb. torque and horsepower EACH as well as aftermarket runners and bases contact for more info and pricing see links below

Send your stock TPI base and you will receive the SAME back

Can also port my own base and ship out for those that want no down time or want to keep there original contact for more info