The V4 heads are pretty good to be fair. I had RCM convert a set for the later GD STI shimless buckets. I'll dig some pictures out they were a work of art.

Worth doing if you're going to be pushing the motor.

I can highly recommend Galloways for machining.
The stuff they did for me was exceptionally good and right up there with RCM's stuff I've had in the past.

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605whp
Quarter Mile in 10.9 seconds @ 135mph /217kph
0-100 kph 3.2 seconds