Dyno’ed at 433
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Add back in the losses from the power steering , water pump , exhaust downstream of the manifolds , a 727 torqueflite , a big dana rear and you get up to about 525 ... That’s the difference between GROSS and NET ... A GM turbo400 sucks about 65-70 hp all by itself in a high powered car ...
Yup. C6 is bad too.
You have it backwards