Edelbrock High-Flo TPI intake

The High-Flo TPI intake has larger runner (round) and intake (rectangular) ports than the stock TPI intake base, BUT still can be ported for larger/better air flow. Casting bumps, etc. should be removed. Some measurements are:

Stock Base runner ports = 39mm diameter (1195 sq mm) (1.470", 1.697 sq in ) *Measured
Stock Base intake ports = 29mm X 44mm (w X h) (1276 sq mm) (1.73"x1.15", 1.986 sq in ) *Measured

Edelbrock Base runner ports = 41mm diameter (1320 sq mm) (1.609", 2.033 sq in) *Measured
Edelbrock intake ports = 29mm X 48mm (w X h) (1392 sq mm) (1.883"x1.13", 2.138 sq in) *Measured

Ported Edelbrock Base runner ports = 45mm diameter (1590 sq mm) (1.757", 2.425 sq in) *Measured
Ported Edelbrock intake ports = 32mm X 52mm (w X h) (1664 sq mm) (1.26x2.05", 2.583 sq in) *Measured

ZZ4 (Vette L98) intake ports = 31mm X 49mm (w X h) (1519 sq mm) (1.220"x1.929", 2.353 sq in) *Measured

The Edelbrock base has some "gotcha"s that you should be aware of...

One is that some of the runner bolt-holes have been known to penetrate the water jacket. Its best to check your install with a water-filled coolant system before installing the runners. Use a quality thread-sealant on any bolts that are used in these "leaky" bolt-holes..

Second, the intake has many options for use on various F-bodys and Vettes.. You will have to block off one of the two EGR ports, depending on your application. Use a high-temp gasket maker to seal the unused EGR port blockoff plate.

Finally, there is a sensor port back near the distributor hole that is also into the water-jacket. Fbodys don't use this port and it must be blocked off with a 3/8"x24 NPT plug and sealant.

Both the vette EGR block off and the 3/8 NPT sensor hole can be seen in here

Click on any image below for an enlargement (~500K) image.