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Old 09-06-2010, 10:52 AM
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sbc heads

I am looking a good set of heads for our psv8 dirt car we are runing a 355 with a 420/420 lift cam 882 heads with 500 lift valve springs 1.94 intake and 1.500 exhaust. I just want to now if there is a better head. This is our head rule if that will help.
STOCK PRODUCTION CAST IRON HEAD NO MODIFICATION OF ANY KIND NO DOUBLE HUMP OR VORTEC HEADS NO ANGLE PLUG HEADS ON GM CARS. NO CLOSED CHAMBER HIGHPERFORMANCE HEADS SUCH AS 461,461X,041,186,OR 492. NO MINIMUM C.C ON HEADS NO ANGLE MILLING AND NO CUTTING INSIDE THE VALVE POCKET NO THREE ANGLE VALVE JOB . VALVE RULE IS MAX 1.94 INTAKE AND 1.5 EXHAUST.
THANKS FOR ANY HELP.

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Old 09-06-2010, 11:39 AM
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My left turner customers like 441 or 487X heads.
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Old 09-07-2010, 07:39 AM
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Thanks for the cast #s I looked them up I like the C.C 'S on the intake and exhaust ports much larger than the 882 heads . You wouldn't happen to now how much you can cut of these heads to get max compression because the 882 head can't be cut that much with out getting into the water jackets.
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Old 09-07-2010, 05:50 PM
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Quote:
Originally Posted by tdawg
I am looking a good set of heads for our psv8 dirt car we are runing a 355 with a 420/420 lift cam 882 heads with 500 lift valve springs 1.94 intake and 1.500 exhaust. I just want to now if there is a better head. This is our head rule if that will help.
STOCK PRODUCTION CAST IRON HEAD NO MODIFICATION OF ANY KIND NO DOUBLE HUMP OR VORTEC HEADS NO ANGLE PLUG HEADS ON GM CARS. NO CLOSED CHAMBER HIGHPERFORMANCE HEADS SUCH AS 461,461X,041,186,OR 492. NO MINIMUM C.C ON HEADS NO ANGLE MILLING AND NO CUTTING INSIDE THE VALVE POCKET NO THREE ANGLE VALVE JOB . VALVE RULE IS MAX 1.94 INTAKE AND 1.5 EXHAUST.
THANKS FOR ANY HELP.
I find that 882's breath better in the lower lifts than 441's. If you're limited to cam duration; the 882 will do you better especially on a short track. The 441s come alive up on the top lifts .4 to .5 inch. If you can run a long duration cam this will take advantage of this characteristic of the 441.

For compression the 441 offers more meat and can be milled .060 without thinning out the deck to where it can't hold a gasket. The 882 is a thin wall piece that gets rather wobbly when milled beyond dot, oh-thirty. I recommend that the 882 be run a zero deck block and only milled enough to keep it straight.

If I was building this with a cam that is limited to .42 inch lift at the valve, I'd run the 882 head on a pre 1974 zero deck block, flat top pistons, as little gasket as I could get away with, very little milling if any on the head. As much cam duration as I can get away with.

Bogie
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Old 09-09-2010, 07:53 AM
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Thanks for the info we will be doing more home work when the season is over.
I am sure I will be asking for more info.
THANKS.
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Old 09-20-2010, 10:24 AM
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Quote:
Originally Posted by tdawg
I am looking a good set of heads for our psv8 dirt car we are runing a 355 with a 420/420 lift cam 882 heads with 500 lift valve springs 1.94 intake and 1.500 exhaust. I just want to now if there is a better head. This is our head rule if that will help.
STOCK PRODUCTION CAST IRON HEAD NO MODIFICATION OF ANY KIND NO DOUBLE HUMP OR VORTEC HEADS NO ANGLE PLUG HEADS ON GM CARS. NO CLOSED CHAMBER HIGHPERFORMANCE HEADS SUCH AS 461,461X,041,186,OR 492. NO MINIMUM C.C ON HEADS NO ANGLE MILLING AND NO CUTTING INSIDE THE VALVE POCKET NO THREE ANGLE VALVE JOB . VALVE RULE IS MAX 1.94 INTAKE AND 1.5 EXHAUST.
THANKS FOR ANY HELP.
ive got a set of 492 heads with comp valves and springs asking 400 for em clean no rust
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Old 09-20-2010, 10:36 AM
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A #416 305 head with larger 1.94" in valves can be flat milled to 52cc.

Acid port them to increase port volume yet appear stock. These 305 heads do not have a "restricted port" like others do. Do a legal valve job but thin the seat width and make the seat as high as possible. Put a 30 back cut on all the valves. (it does not say you cannot) Clearance grind the chamber wall just enough to restore valve to chamber wall clearance with the larger valve and sand blast to hide it. You can also grind the 1.94 valves down to 1.90" so they fit the stock untouched chamber yet flow more than stock.
Block the exhaust port egr passages. With some "hidden porting" and the larger valves these heads will outflow a 76cc head and the cr will be much higher.

Install with a thin head gasket.

Last edited by F-BIRD'88; 09-20-2010 at 10:45 AM.
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Old 09-20-2010, 10:41 AM
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I think your biggest worry will be your 2 angle valve job... That can make more of a difference than what casting you start with. If you want compression I would run some 416's with the 1.94/1.5 valves and spend some time on the flow bench trying different valve seat dimensions.

Can you fill the exhaust crossovers?

Are there any restrictions on the valves besides OD?

Can you modify the chamber?
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Old 09-20-2010, 10:51 AM
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Originally Posted by prochev12
ive got a set...
Advertise them! Click on "Classifieds" at the top of the page to get started. The mods don't allow advertising on the open forum.
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