Re: Problem at the machine shop
[Re: Twostick]
#1713034
12/20/14 05:00 AM
12/20/14 05:00 AM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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buy 72-73 340 pistons, there compression height is .100 less then the 68-71 340 piston.
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Problem at the machine shop
[Re: 70AARcuda]
#1713035
12/20/14 09:29 AM
12/20/14 09:29 AM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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Sounds like you have a 360 stroke crank with a 340 compression height piston.
A 340 with standard ch pistons should not stick out .100 on a 9.53 block. That is only .050" shorter than stock.
What is the CH on the new pistons? 3.31 stroke divide by 2, 1.655". Add that to your rod length, should be 6.123", 7.778". Subtract this number from you deck height. That will be the tallest ch you can use.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Problem at the machine shop
[Re: JohnRR]
#1713037
12/20/14 02:28 PM
12/20/14 02:28 PM
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Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
mike s
top fuel
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top fuel
Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
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Weren't the stock 68-71 pistons positive deck? +.020 or so IIRC
Leave the gun.......take the Cannoli's....Mike
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Re: Problem at the machine shop
[Re: 70AARcuda]
#1713038
12/20/14 02:34 PM
12/20/14 02:34 PM
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Joined: Feb 2007
Posts: 316
Utah
dragnduster
enthusiast
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enthusiast
Joined: Feb 2007
Posts: 316
Utah
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Quote:
buy 72-73 340 pistons, there compression height is .100 less then the 68-71 340 piston.
It has been along time since I built a 340, but if I remember correctly the 68-71 340 piston had a stock positive deck height of .045. If you block has been decked down to 9.538 then it is approx .062 shorter than stock which would make the 68-71 piston stick approx .107 out of the hole. My figures may be off slightly but if you put the 72-73 piston in which is .100 shorter you should be near a zero deck.
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Re: Problem at the machine shop
[Re: rickb67]
#1713041
12/21/14 01:56 AM
12/21/14 01:56 AM
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Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
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What was the compression height of the old pistons?
Without Data, you’re just another guy with an opinion.
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Re: Problem at the machine shop
[Re: rickb67]
#1713042
12/21/14 02:09 PM
12/21/14 02:09 PM
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Joined: May 2003
Posts: 13,189
aZLiViN
J_BODY
I Live Here
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I Live Here
Joined: May 2003
Posts: 13,189
aZLiViN
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Quote:
Had a 73 340 sitting in corner of garage and picked up a 80 step side 2wd. Tore down the engine 2 cylinders bad . Took everything to machine shop.Needs bored crank turned rods balanced.So I order .060 over pistons and get a call the pistons are out of the block .100. well that won't work.I ordered Kieth Black pistons. Deck height is 9.538. need ideas. this was to be a cheep build ha ha.
what machine shop? I've had B&M do 3 engines and they all worked very well.
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Re: Problem at the machine shop
[Re: cudaman1969]
#1713044
12/21/14 02:23 PM
12/21/14 02:23 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
just use a thicker head gasket(multiple layer gaskets can go up to 1/4 inch) deck height will be back where the intake fits.
you could probably buy a new block for what it would cost 
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Re: Problem at the machine shop
[Re: Quicktree]
#1713045
12/21/14 02:35 PM
12/21/14 02:35 PM
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Joined: Jan 2004
Posts: 8,265
fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,265
fredericksburg,va
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Quote:
Quote:
just use a thicker head gasket(multiple layer gaskets can go up to 1/4 inch) deck height will be back where the intake fits.
you could probably buy a new block for what it would cost
about the price of those new pistons
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Re: Problem at the machine shop
[Re: rickb67]
#1713047
12/21/14 08:50 PM
12/21/14 08:50 PM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Pistons + lathe + 1 hour = fixed
"use it 'till it breaks, replace as needed"
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