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Old 12-01-2012, 05:05 AM
454C10 454C10 is offline
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stock hp is 275 with the tiny stock cam.
should make maybe 300 with the bigger cam.
330 with headers and exhaust

Are you going to put on a intake and carb or use the stock efi?
That engine has a factory roller cam so I hope your cam is also a roller cam.
You also need to modify your vortec heads to handle more lift.
I would also recommend doing a little DIY bowl smoothing on those vortec heads, especially around the exhaust ports.
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