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440 Engine Build With KB237 Pistons ??
#587946
01/19/10 09:43 PM
01/19/10 09:43 PM
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Joined: Jan 2003
Posts: 2,655
western PA
mopar4ya
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,655
western PA
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Trying to help a local fellow out with an engine build. He has a 440 block with a stock deck height,stock stroke and a set of .030 KB237 pistons.Cylinder heads are the closed chamber 915's. Anyone know what the piston/deck height might be. Also, anyone running this combo that could give some input on a good street hydraulic cam. He doesn't want to get into adjustable rockers. He had a few guy's recommend the Mopar P4120237 .509/.509 cam, but I'm thinking there are better cam choices to use. This is going in a 3600 lb street car with a 3:55 gear. Last what would be your first and second choice for a good intake. Thanks Dan 
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Re: 440 Engine Build With KB237 Pistons ??
[Re: mopar4ya]
#587947
01/19/10 10:58 PM
01/19/10 10:58 PM
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Joined: Jan 2003
Posts: 3,490
Annapolis, MD, USA
Vert
master
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master
Joined: Jan 2003
Posts: 3,490
Annapolis, MD, USA
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I'll give you a bump here. What year block? My '77 block was nearly 1/8th inch down to piston top. Now its .005. Have the block decked. I have those pistons as well. Follow the mfg. directions for clearances, both cylinder wall and rings. They are not suggestions. They are directions. I like the Edelbrock Performer RPM intake. Will this be an automatic or stickshift car? Cam choice is somewhat dependent on this as will be torque converter for an auto car. Another reference here is http://www.moparts.org/Tech/Archive/bb/59.html for the 'default 525HP combo'. And http://www.kb-silvolite.com/kb_car/performance.php?action=details&P_id=30 will quickly calc compression based on head volume.
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Re: 440 Engine Build With KB237 Pistons ??
[Re: DaytonaTurbo]
#587949
01/20/10 09:10 AM
01/20/10 09:10 AM
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Quote:
Those pistons should be around .02-.03 in the hole. Really he should have his deck squared and milled so the pistons are at zero deck. That way he can setup those closed chambered heads for quench with some generic .039" head gaskets.
new math????
How do you figure a 2.067 comp height piston will be 20 to 30 down the hole
WILL BE CLOSE TO 0 DECK!!
use a fel pro composition gasket and you will have .040 quench just go on with your life!
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Re: 440 Engine Build With KB237 Pistons ??
[Re: Mr.Yuck]
#587952
01/20/10 08:11 PM
01/20/10 08:11 PM
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Joined: Jan 2003
Posts: 2,655
western PA
mopar4ya
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,655
western PA
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The car is an automatic, but I don't know what he is using for a converter.The block I believe is a 74. I will get some more info tomorrow. Thanks for the input !!!! Dan
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Re: 440 Engine Build With KB237 Pistons ??
[Re: Dodgem]
#587953
01/20/10 08:34 PM
01/20/10 08:34 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
new math????
How do you figure a 2.067 comp height piston will be 20 to 30 down the hole
WILL BE CLOSE TO 0 DECK!!
use a fel pro composition gasket and you will have .040 quench just go on with your life!
If his deck has not been squared and milled, you have to leave some to account for production tolerances. Ideally the KB's would be more like .015 in the hole with a stock deck if you happened to somehow get a 100% perfect factory deck. Also at first I was more thinking of the trw2355 2.061 ch.
10.725 deck height - (6.768 rod length + 2.067 KB237 piston + 1.875 half of crank stroke) = .015. Leaving some room for production tolerances in deck height/squareness front to back and side to side, crank throw and rod lengths he could easily be further in the hole than the calculated ideal. IMO if you're taking the motor this far it only makes sense to have the deck measured, squared and milled so it's perfect. If the motor's in the car already, a set of steel shim gaskets would get by for 'close enough'. Use a felpro .040 type gasket and I bet your friend will be beyond or very neadr the end of the usable piston/head clearance for quench.
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