Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Need help diagnosing really weak rebuilt 350
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Old 01-27-2013, 01:46 PM
gfackrell gfackrell is offline
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Originally Posted by vinniekq2 View Post
If the engine is new,after 20 hours it should either improve or deteriorate quickly. I hope it was broken in properly?after 20 hours should be good to go and then some. 275 horses is not really a very high out put.Other than power,what complaints do you have?
I should have reread your first post,,,,what do you expect your boat to do with 170 ish horse power.A lot of boat v-8s run at 70% and its 20 feet long.
re leak down,it would be nicer if all the values were equal.
I followed the rebuilders recommendation and put a zinc additive in the oil for initial startup. I also ran the rpm to 2000 immediately on startup. Ran it like that for 5 or so minutes, then let it come down to idle and varied the rpm for the next 5 minues. Then to the lake, where I drove it at varying speeds for about an hour. For the next 5 or so hours I never pushed it hard, and tried to vary speeds.

It was supposed to be a stock replacement, and yes 275hp isn't very impresive, but I was/am on a budget. No other complaints really, it's just weak. It can only push the boat to 30 mph at 5200 rpm. The boat is empty, and light. I am hoping for 40 mph plus, and thought that a good 275 hp engine would do it.
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