My question is are there any issues with egr or mounting of intake on motor.Swapping from a 305 tpi to a zz4 tpi. What am i going to need to replace.

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1990 IROC TPI305, MSD 6A, DYNOMAX MUFFLER, MEGASHIFTER, 160 THERMOSTAT, HYPERTECH FAN SWITCH, AND A BLASTER COIL. WITH MORE TO COME!
2000 WS6
Dynomax muffler,
Paxton 12psi supercharger, Dynomax muffler and high flow cats, MSD ignition 6al and wires, corvette shift kit for my automatic tranny.

 

Yes, the ZZ4 heads have no EGR setup in them, and the heads have the 86 and earlier bolt angles on them. You'll need an aftermarket intake manifold like Edelbrock, TPIS, or Accel, and route the EGR like an L98 Corvette does to be smog legal.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

I had my stock 92 TPI base cut to fit my ZZ4 heads at a machine shop for $25.
The Corvette EGR set-up does not seem to difficult to rig up.
Everything else was easy. The passenger side head is missing one bolt hole for the serpentine belt brackets. No problem, there are plenty others and bracing present. Engine oil cooler lines will not fit around the larger harmonic balancer. Just run Mobil One like the Vettes. You'll also need a new water pump, can't use the one that come stock on the ZZ4. I also swapped my valve covers from my L98 to the ZZ4 so all the gromet holes were correct. ZZ4's have the same valve covers on both side. I was able to sell all the parts I took off my ZZ4, intake, waterpump and valve covers on this board.


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Rob P
89RSconvtZZ4TPI
Edelbrock Hi-Flow Intake
SLP Dual Cold Air Intake
1 5/8" Headers
Semi-Siamesed Runners
MSD6AL/AdjFPR/IROC frnt@rear swaybar/wonderbar/steeringbox/alum drvshaft/ Alston SFC/3:23posi disc rear/MAC LCA/H.Adams Panhard Rod/KYB struts/ shocks/
92Z28convt5spd
71Impala convt 402BB
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