this is a magazine build Im hoping goes well

[grumpyvette]

http://www.gmhightechperformance.com/te ... oject_car/

I don,t know exactly what they have in mind but any magazine doing a TPI based first gen SBC rather than a LS based engine is refreshing build

 

[87vette81big]

Be interesting to see the Build Results Grumpy.
Pretty nice original 1987 Formula Firebird.
Been a while since I seen one driven daily around here.

 

[grumpyvette]

just for grins lets do some parts matching math on a tpi
your basic TPI intake runner has about a 1.5" diam cross section,(about 1.8 sq inches) and that restricts power to about 3400rpm-4400rpm before the intake starts restricting air flow
the newer (FIRST TPI) has about a 1.75" diam runner(about a 2.4 sq inch cross section)and that restricts power to about 4400rpm-5400rpm before the intake starts restricting air flow
on a TPI first gen engine build keep in mind that doesn,t mean the engines won,t reve higher its just that the torque curve will tend to peak and level off due to the restriction, use of a cam with the correct timing and a well designed set of headers on a low restriction exhaust will increase scavenging and tend to extend the effective rpm band
piston speed should not exceed about 6300rpm on a 3.75" stroke
with these limitations your looking for a cam with a max duration in the 240 @.050 lift range and a minimum in the 220 degrees duration @.050 lift range
if you want to maximize the power from that 383


TPI Torque Specifications

Below are the torque specifications as designated by GM for Tuned Port Injection intakes. Please note that some specifications are in lb. ft., and some are in lb. in.

Manifold to Runner Bolts 25 lb. ft.
Runner to Manifold Bolts 25 lb. ft.
Fuel Rail Attaching Bolts 15 lb. ft.
Throttle Body Attaching Bolts 18 lb. ft.
Throttle Position Sensor 18 lb. in.
Idle Air Control Valve 13 lb. ft.
Throttle Body Coolant Plate 27 lb. in.
Throttle Body Cover Plate 30 lb. in.
Power Brake Vacuum Fitting 108 lb. in.
Fuel Line Nuts 20 lb. ft.
Fuel Tube Bracket Bolt 25 lb. ft.
Fuel Pressure Connection 115 lb. in.
Pressure Regulator Base to Rail 44 lb. in.
Pressure Regulator Bracket 44 lb. in.
Outlet Tube to R/H Rail Retainer 44 lb. in.


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