Does anyone have any idea roughly how many hp it would have with the bigger cam and dual exhaust?
you're going to have to give us more than just "next size up" for cam info.
and what 'kind' of hp are you asking about, anyways? flywheel? chassis dyno?
The specs say it should be making 260hp factory.
you have to remember, 1971 was still a gross hp rating. 1972 is the first year motors were rated in SAE Net, which is much closer to what we use for modern HP ratings. 1972 is almost the same engine configurations as 1971 and the change from Gross to Net dropped the WB code engine to 195hp from the 260hp that the TB 350 was rated in 1971.
since it looks like you're doing a full rebuild you want to get the 1970 SP code pistons, money permitting. the 1970 SP code engine was rated in Gross but it was still 315hp. most of that comes from the 10.25:1 compression that is due to the shallow dish pistons.
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