How to Build a Twin Turbo Big Block Chevy 502

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Do you need 1400 HP and want it to run on E-85 fuel? Just grab 2 turbo-chargers off of a 3.8 Buick Grand National, and you are on the way. The single turbo from the 231 cubic inch v-6 is perfect when you put one on each side of a 502 cubic inch monster.

Steps

1. 1
   Buy a 502 crate motor 8.75:1 compression. Re-clearance the rotation assembly - extra clearance in the bearings for additional crank flex, and open up the ring gaps for the additional heat of the turbocharger.

   
   
2. 2
   Learn how to read a turbo map, decide what your HP goal is, and buy the correct turbos. For an old school 800hp setup - a pair of T04B V1/V2 compressors, P trim turbine with about a 1.2A/R is a good start. For a more modern setup, a pair of GT4094's would be a powerful combo with low RPM spool up.
3. 3
   Spend the money on your fuel system to keep up with the HP and boost levels. A boost referenced FPR is a must. I would use either a Racepumps mechanical pump, Aeromotive, or similar. Blow through carb, FI, will both work. CSU makes a nice Blowthrough carb setup.
4. 4
   Tune it fat to start, and with low boost. Keep the timing low to avoid detonation. Tune it for whatever fuel you will be running most of the time. A wideband 02 monitor is a must.
5. 5
   Enjoy...

   
   

TIPS;

• Always use fresh fuel since fresh E-85 is 108 octane.

Warnings

• Tire wear can be a real problem if you are running the Harmon Systems 502 twin-turbo system.

• SOURCES AND CUTATIONS;

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