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Old 12-31-2003, 06:42 AM   #1
83ZZ502_Jimmy
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Stock 350 TBI Compression Ratio and Head CC ?

I have a stock 350 tbi and I am looking for the stock head CC size and compression ratio.

Also does anyone know if it would be 2 or 4 bolt mains?

Thanks in advance, [img]/forums/images/graemlins/thumb.gif[/img]
John
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Old 12-31-2003, 09:36 AM   #2
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Re: Stock 350 TBI Compression Ratio and Head CC ?

Most stock 350's run 76cc heads and the compression ratio should be around 8.2
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Old 12-31-2003, 09:37 AM   #3
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Re: Stock 350 TBI Compression Ratio and Head CC ?

8.2 to 1 and 76cc
For the most part with TBI:
Light duty trucks got 2 bolt mains(under 7200 GVW)
Heavy duty got 4 bolts.
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Old 12-31-2003, 10:18 AM   #4
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Re: Stock 350 TBI Compression Ratio and Head CC ?

Is there any other difference between the LD and HD engines. I see the Goodwrench replacement for the 4 bolt is $100 more than the 2 bolt. Is everything else the same? [img]/forums/images/graemlins/ears.gif[/img]
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Old 12-31-2003, 02:19 PM   #5
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Re: Stock 350 TBI Compression Ratio and Head CC ?

Thanks guys! [img]/forums/images/graemlins/thumb.gif[/img]

John
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Old 01-01-2004, 10:02 AM   #6
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Re: Stock 350 TBI Compression Ratio and Head CC ?

I am not sure about the replacement engines. But from my experience with them I have found the main difference in the stock TBI engines is in the heads. The heads in the HD engines flow even worse than the ones in the 1/2 tons. Many (not all) 89 and up 1/2 tons and K5s and up got swirl port heads which aren't half bad [img]/forums/images/graemlins/thumb.gif[/img])
Because of the head design.The HD engines build more torque sooner in the RPM range,but run out of air on top end.

GM used 3 or 4 diferent heads with small variations in design for diferent applications on TBI 350s.
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