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jacobgiles
 Post subject: if i have
PostPosted: Oct Tue 06, 2009 5:07 pm 
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Location: atoka tn
a 4.75 crank and a 10.2 deck height block and a piston that has a 1.12 CH what length rod do i need? 6.600 or 6.700?
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bbnova
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PostPosted: Oct Tue 06, 2009 9:09 pm 
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10.2 block subtract 2.375 for the stroke is 7.825.

7.825 subtract 1.12 CH is 6.705

If it is a aluminum rod you need to be say .020 in the hole, so....

6.705 subtract 0.020 is 6.685 long rod.


Hope this helps.

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BT Race Cars
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PostPosted: Oct Wed 07, 2009 9:46 am 
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bbnova wrote:
10.2 block subtract 2.375 for the stroke is 7.825.

7.825 subtract 1.12 CH is 6.705

If it is a aluminum rod you need to be say .020 in the hole, so....

6.705 subtract 0.020 is 6.685 long rod.


Hope this helps.

SHOW OFF !! :lol:

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bbnova
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PostPosted: Oct Wed 07, 2009 10:49 am 
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:wink:

Done it once or twice..... :lol: :lol: :lol:

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jacobgiles
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PostPosted: Oct Wed 07, 2009 3:15 pm 
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you got some 6.685 rods laying around :lol:
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jacobgiles
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PostPosted: Oct Wed 07, 2009 3:16 pm 
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im not going to run a aluminum rod, im just gonna use a h beam or something that is off the shelf. the piston recomended a 6.600 rod and i knew that wasnt rite.
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bbnova
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PostPosted: Oct Wed 07, 2009 9:19 pm 
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As a matter fo fact, I do.... GRP's





jacobgiles wrote:
you got some 6.685 rods laying around :lol:

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bbnova
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PostPosted: Oct Wed 07, 2009 9:21 pm 
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So you may get away with a 6.700 long rod then. I would talk to your piston maufacturer though...





jacobgiles wrote:
im not going to run a aluminum rod, im just gonna use a h beam or something that is off the shelf. the piston recomended a 6.600 rod and i knew that wasnt rite.

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jacobgiles
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PostPosted: Oct Thu 08, 2009 7:39 am 
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i called world products (mahle makes this piston for them for there crate engine) he gave me the part number for the rod they use. its a 6.7
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bbnova
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PostPosted: Oct Thu 08, 2009 12:08 pm 
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What head gaskets???

Spray???

RPM????

Chevy head or big chief???

Carfull when chosing your cam since you are going with a off the shelf piston...

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jacobgiles
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PostPosted: Oct Thu 08, 2009 8:03 pm 
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Location: atoka tn
my block has O rings so im not really sure what head gasket to use. it will not see any nitrous, the piston specs are:

Bore (In) 4.600

Stroke (In) 4.750

Rod (In) 6.600

Pin .990

Comp Hght 1.120

Weight 528g

C/R @ 0 deck 10.4:1

Crown -6cc

i am using a conventional head. this isnt going to be a max effort motor, i want it to be pump gas friendly also
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