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heres more bbc info, but don,t let the guys make you think only oval port heads work well! it totally depends on your combo,s rpm range,displacement,gearing,weight,cam timeing,etc
read the links and sub links below
a day or so spent doing reading and research,
(reading links and threads)
will frequently save you thousands of dollars and weeks of wasted work.

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I've got a 350 in one of my cars that i bought locally.i took a chance on it and heard it run but it didn't have an oil pressure gage .it ran very good and it had a tag saying that it was a gm replacement eng,i had to put a rear sump pan and pickup on it and it looked good inside but we never looked at the bearings.at startup, it goes to about 45-50 but starts drop...

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If your car won,t start consistently, you need to isolate the problem to the source,
you can,t isolate the cause without understanding the process, so you may as well start looking into how and why each step in the process starts , and how each step functions and triggers the next step.
your sensors are feeding data to the cpu, and its almost always a failure of a sen...

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http://www.amosauto.com/Articles/Genera ... tunnelport








The pushrods ran right through these tubes, which allowed for much larger ports.
...


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the real basics, (off ebays site)-------------------------------------------------------------------------------
"
This guide is intended to help you sort out the more major differences among Big Block Chevrolet engines produced since 1958. Chevrolet has designed and produced several different "big block" engine families. Within each family, there can be evolutionary cha...

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