Small block w/ 3.79 crank

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PROSTOCKTOM said:
There are lots of ICON pistons available for the 4" stroke crank with a compression height of 1.445" in most variations except for the dome pistons that come with a 1.465", but they are all made with the .984" pins. Using a 1.445" compression height piston would be great with a 6.250" rod IF you could get them in a .984" pin, but you can't. I know JE makes a shelf piston for a 4" stroke with a 6.125" rod length and .927" pins, but they are over $1500 a set.

Tom
Click to expand...

I haven’t seen an Icon piston with a dome I need. I need a dome for W2 chambers plus the piston needs to come out of the deck about .050ish.

Plus they are all 1/16 ring packs. It’s not that hard to tool up and switch to .043 or if it’s cheaper or better 1 mm rings.

The .984 pin thing is easy to deal with. Who knows?? I may call Bill Miller and order a set of aluminum rods.
 
go-fish said:
@ValiantS @tvt59 @TT5.9mag

I, like @mopardude318 , am putting together a 3.79 piece meal. After seeing the longer rods in question it makes me wonder if I put the cart ahead of the horse on one of my purchases, rods. And, I'm only two components deep into my parts collecting!

I have a virgin NOS 5.9 bare block I bought from John Irving that MP gifted him during the Magnum 380 crate engine days. Later, I looked at the Monar site and got the spec for the rods, minimum 6.125". So I bought the chevy rods that is 6.125, 2.1 journal, .927 piston pin, ....

Molnar's crank:

360-3790FB6FSmall Block Chrysler -2.100" Rod Pins3.7903602.1006.125


My rods:

Brand:
SCAT Engine Components
Manufacturer's Part Number:
2-350-6125-2100A
Connecting Rod Length Center to Center (in.):
6.125 in.
Connecting Rod Material:
Forged 4340 steel
Wrist Pin Style:
Floating
Pin End Bore Diameter:
0.927 in.
Rod Journal Diameter (in.):
2.100
Big End Bore Diameter (in.):
2.2250
Quantity:
Sold as a set of 8.
Cap Retention Style:
Cap screw
Big End Width (in.):
0.940
Clearanced for Stroker:
No
Connecting Rod Bolt Brand:
ARP
Connecting Rod Bolt Diameter:
7/16 in.
Connecting Rod Bolt Material:
ARP2000 alloy
Fastener Tensile Strength (psi):
200,000 psi
Connecting Rod Bolt Head Style:
12-point
Weight Matched Set:
Yes

There's a set of pistons that Richard Nedball is selling that I was thinking would work with my rods. [FOR SALE] - New BRC 4.030" Forged Pistons and pins for 3.79" Stoke Crankshaft

It would be nice to pick these up if they work with my rods. Piston wrist pin is .984 but my rods have a pin diameter of .927. I figure the rod pin hole can be bored .057"?

In retrospect, its better to rat hole your money instead of rat holing parts so you can buy everything at the same time. I would be very pleased if the rods I have will work, especially with the pistons for sale.

Now, as was mentioned 6.5' rods will have a higher rod ratio that 6.4" rods so the shorter rod will be better for wear and longevity? Is it better the shorter the rod is? Would a shorter rod (6.125) and taller piston be better for stability?

I apologize if these are elementary questions.
Click to expand...
"I apologize if these are elementary questions." I just saw this. Probably best to start another thread with your questions but, since we're here...Generally with a 59* combo, it's better to keep rpm lower. That would require a bigger crank which would also allow more cam per net lift(gentle profiles). Without anyone's used pistons in hand it'd be hard to build or recommend an entire combo around them. I'm not afraid of used pistons, just asking; "are they good in many senses?" Albeit they are a big ticket item anymore. Since you are now just collecting pieces, the first item to consider would be which heads fit your goals and budget IMO. Don't overlook the reality that custom head gaskets allow for recips that dimensionally fall within a ballpark of 'perfect'.
 
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