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Old 06-05-2012, 01:07 PM
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58cc small block chevy heads

what kind off power can i get by puting these heads on a 1989 350 block with a 4 barl holley carb thanks

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Old 06-05-2012, 01:16 PM
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There is no where near enough information given to know. My guess is 43.2hp. We need to know more about the engine including cam specs, current compression, current cylinder heads, what cylinder heads these 58cc heads are you speak of, intake, exhaust, timing, and carb will all be helpful.
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Old 06-05-2012, 01:24 PM
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Is the block decked? Or are the pistons 'down in the hole'; if so, by how much
my guess? 53.625hp and 23lbft of tq

Last edited by AutoGear; 06-05-2012 at 01:32 PM.
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Old 06-05-2012, 05:10 PM
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all l can tell you right now is the engine is from a 1989 chevy van, 350..throttle body. And l'd like to put these heads on it. Thinkin about putting cam's in it. Dont know for sure if going to do it. The head casting numbers for the head l want to put on is 14022601.Going to put some type of aftermarket intake on it with either 600 holley or 750 holley with hei (the two wire style) Shorty headers thanks

Last edited by fordss; 06-05-2012 at 05:18 PM.
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Old 06-05-2012, 06:02 PM
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You can expect better low end power for sure, but without working those heads you won't be making much power past 4,500 or so rpms. Good for a daily driver with weight unless you dig deeper on the combo and heads.
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Old 06-05-2012, 08:02 PM
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dose any 1 know how much lift i can get out of these head ..stock head , could i put a rv cam in it or little biger thanks
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Old 06-05-2012, 10:25 PM
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I strongly suggest vortec heads with rv cam choice. Thet are getting pretty cheap and they work.

58cc factory heads are not solidest of performers.
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Old 06-06-2012, 02:12 PM
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I did a build with 58 cc Trickflow 87-95 Centerbolt heads with 175 cc runners and was very happy with the results of a TBI 350. It had 9.7:1 compression a XE256 comp Camp with 1.6:1 rockers. Tuned chip from Brian at TBI Chips. Ran 454 TBI injectors, and a matched 50mm TBI intake. Very torquey and good top end for a TBI engine. My point here is use good parts. Trickflow, AFR heads really make the difference.
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Old 06-06-2012, 03:35 PM
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5% more hp than what you have now for every 1 point increase in compression. That engine probably struggles to make 180 HP. You're looking at 9-18 more HP max with just a head change.
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Old 06-06-2012, 07:03 PM
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You can expect some more torque (because of the compression ratio increase) bit not a lot more horsepower.
Use a champion RV8c plug with these heads on your 350.
put premium gas in the tank.

To get a lot more power using the 601 heads you want to fully
home port them and install larger 1.94x 1.60 valves.
Bolt the 601 heads on using a felpro 1094 head gasket.

Now you got more air flow and more compression
to make more power and more torque.

Now you can upgrade the camshaft.
Something around 211 to 218@.050" duration.
Keep the lift .470" or less for stock rocker arms.
Upgrade the springs with new Z/28 style high perf
like Lunati 73943. or same.

Cam: Try a Crane #10017 Energizer 274 H06
Get some headers and dual exhaust.

Make sure you hang on tight first time you rug it.

If you just bolt the 601 heads on stock keep your
expectations modest.
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Old 06-06-2012, 07:43 PM
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the engine is 1990 ls9 350 ... could some 1 tell me a ruff guess of compression using these head on this stock block thanks
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Old 06-06-2012, 08:16 PM
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for real?

Say you have 58 cc heads, .040 gasket, .030 overbore, the pistons have about 5-10cc of space between the gasket surface, that is the neighboorhood of 11:1.

Swept 350 volume 716cc or so, and total combstion volume being around 70 something.
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Old 06-10-2012, 05:16 PM
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Quote:
Originally Posted by spinn
for real?

Say you have 58 cc heads, .040 gasket, .030 overbore, the pistons have about 5-10cc of space between the gasket surface, that is the neighboorhood of 11:1.

Swept 350 volume 716cc or so, and total combstion volume being around 70 something.
You are not even close.

Stock bore 350 with stock dished pistons -15cc @.025" deck clearance
58cc heads, thin .015" felpro 1094 gasket

the compression ratio will be 9.8:1

Some of the 601 heads are 53cc.
In that case the cr will be 10.38:1 assuming the same .015" gasket.

but to get any real horsepower you want to install larger 1.94x 1.60" valves.
That will make the chamber bigger 58 to 62cc finished.

CC your heads. They are not all the same.
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Old 06-10-2012, 10:31 PM
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Your right I guess I failed the math. Divide 716 by 70 something. Ha, like the neighboorhood of 10:1.
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