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355 chevy, how much horsepower?
I have a 355, 350 bored .060 over, with a Lt-1 edelbrock intake, 650 edelbrock carb, GM 30 heads with steel rocker arms none stock but none roller, solid lifters, Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 282/292, Lift .465/.488, performance timing chain number 5288, mallory electronic ignition, hedman headers, one purple hornies glasspack, and one thrush glasspack. a rough estimate would be greatly appreciated
compression should be about 9-9.5:1
the cam and lifter i got the specs from summit, i did not build the engine, i vought from a guy for 400. he was not really clear with the details. hence i have to guess a lite from what i've seen. the heads are stamped with GM30. there is also a langer number stamped near it.
I'm a little confused as well on your description as chevyracer is. I've heard an .060 overbore being called a 355, so I'm fine with that (which is generally why I'll call it a 350 with an .060 overbore!) Are you running solid lifters on a cam designed for hydraulics? I'm fine with that, too. The 30 heads - is that a set of heads with a 30 degree back cut? Are they ported/polished?
One thing I do know is that Edelbrock does make a 650 cfm carb - the newer series Thunder AVS - the 1805/1806 is a pretty good performance street carb for a small block. I have to keep remembering that as well, since most of us are used to the older Performer series - the ones that have a huge jump from 600 to 750.
So, not being sure of the heads you have, and guesstimating from the cam, I would guess you're running about 350 hp or so at the flywheel. But this would be give or take 40 or 50 hp!
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