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01-28-2013, 11:53 AM
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#1 |
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Junior Member
Join Date: Mar 2005
Location: chitown
Posts: 55
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stick shift piston to head clearance?
Is .040 ok or should i put a thicker head gasket on it. zero deck motor.
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01-28-2013, 12:01 PM
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#2 |
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VIP Member
Join Date: Mar 2002
Posts: 1,106
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Re: stick shift piston to head clearance?
Type of engine? Piston to wall clearance? Class?
__________________
68 Chevy11 327 F/S |
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01-28-2013, 04:28 PM
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#3 |
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Member
Join Date: Sep 2003
Location: South Eastern Alberta, Canada
Posts: 311
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Re: stick shift piston to head clearance?
Piston weight ?
RPM ? Stroke length ? Steel or aluminum rod ? ! ! With 720 gram bare piston, I run .036" , to 7400... no issue.
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Aubrey N Bruneau 6409 C/S 62 BelAir sport coupe, 409 HP 409 |
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01-28-2013, 06:33 PM
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#4 |
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Member
Join Date: May 2003
Location: Billings Mt
Posts: 282
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Re: stick shift piston to head clearance?
We ran .050 on a 68 Camaro Z/28 stocker back in the early 80s. Those were the stock piston rule days. We wouldnt have if we could have cut the valve reliefs
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01-29-2013, 11:57 AM
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#5 |
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Senior Member
Join Date: Jan 2007
Location: N/A
Posts: 882
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Re: stick shift piston to head clearance?
Plenty with steel rods, no matter the rpm.
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don,t have one |
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01-29-2013, 12:00 PM
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#6 |
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Junior Member
Join Date: Mar 2005
Location: chitown
Posts: 55
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Re: stick shift piston to head clearance?
I don't have all the specs,but it's a 540 mopar with 4.500 bore and 4.250 stroke and uses a 7.100 steel oliver i-beam that i spin to almost 8000 rpm.
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02-02-2013, 02:59 PM
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#7 |
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VIP Member
Join Date: Nov 2008
Location: Glendora,Calif.
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Re: stick shift piston to head clearance?
Are you talking deck height or piston to valve clearance? With a 4 speed, you need at least .080" intake and .100+ piston to valve on the exhausts. As far as deck height on that big of a motor, .045 total would be a real close call. Stuff stretches disproportionally at RPM, more so on a big inch long stroke motor. In fact, stuff you can get away with on a 283 won't work on a 350 without collision of parts. On small block stocker engines, we've run .028 total deck(block height and head gasket thickness combined), with .040 intake and .050 exhaust P to V with an automatic trans. I know, that's enough to make anybody nervous, it should.That's sometimes what it takes.
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