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Old 03-29-2012, 07:49 PM
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need help with some head info

Ok I have a 1990 chevy 350 the heads are bad ..bent valve exct.. ok I have a 84 chevy 305 and a 98 chevy 350 ..now whitch will be better to use for this and what will be a good cam for a daily driver its a chevy 1/2 ton truck 1990with 700r and 3.73 gears.....thanks guys

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Old 03-29-2012, 08:53 PM
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Any info ....
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Old 03-30-2012, 06:58 AM
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IMO, the best approach would be to repair the heads you have. Neither of the pairs you "list" will be a "bolt on" affair, as the intake manifolds are different. If you have the 193 (last three digits of the casting number) heads, the exhaust valves are less than $8 each at an expensive shop. If you have the 191s, maybe $15 each...

Even if one or both of the heads are "cracked" and deemed unusable, you would be better off replacing them with "like" units. For a truck engine, those "winged" intake runners are excellent. BTW, these are REALLY "vortec" heads in the sense they induce "swirl" (or "create a vortex") in the cylinder. What are popularly known as "Vortec" heads really "aren't"... (:- These heads are easy to find and relatively cheap. The 191 casting is the "heavy duty" using hardened seat inserts and large-stem exhaust valves. 193s are the "run of the mill" pickup heads.

If this is a high miles engine (over 150K), I emphatically recommend you at least re-ring the bottom. Often, if heads are replaced n a worn bottom half, *** alters the wear pattern on the rings and they can fail in short order.

Jim
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Old 03-30-2012, 07:15 AM
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another idea would be to swap out the top end from the 98 350 as well as the computer, or another idea would be to use the 98 heads, buy a vortec intake manifold, and switch the motor from EFI to carburated, but that will take some more money. cheapest fix will be to just have the factory heads fixed.
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Old 03-30-2012, 01:09 PM
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Think I M going to bolt the vortec heads on motor and intake and bolt trottle body and let it rip....
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Old 03-30-2012, 01:46 PM
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This is your second thread about these heads, please don't double post, asking the same questions. Moving to Basics.
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