[SOLD] 360 Eagle I Beam Rods & KB SL Hyper Pistons

[red_srt10]

I have 8 Slightly Used **4.040** Eagle I Beam Rods and KB Silvo Lite Hypereutectic Pistons for a 360. The Pistons have SL and 190 casted on the side of the pistons. I bought a car and it already had a fresh 360. Decided to build stroker and obviously could not use these rods and pistons. The engine had very little run time.

PM with any questions and additional pics.

$280 Plus Shipping.

 

[krazykuda]

What compression do they make with a standard 340/360 head and non milled block and heads?

 

[red_srt10]

Based on the KB website and providing the piston id is correct:

Head CC - Compression Ratio
62 - 11.8
64 - 11.5
68 - 11.0
72 - 10.5

Obviously depending on head gasket thickness, may have a slight impact
on Compression.

 

[krazykuda]

Thanks for the info. A little high for what I was looking for.

 

[red_srt10]

...bump....

 

[340plot]

will these work in a 70's model 360? if so, im intrested.

what size bore are these for? standard?

 

[krazykuda]

will these work in a 70's model 360? if so, im intrested.

what size bore are these for? standard?

He states that they are for a 360. Bore size is 4.040".

Standard 360 bore is 4.000, so these being 4.040 would make them for a 40 over 360.

These would fit a standard bore 340 (being 4.040"), but I'm not sure what it would do to the compression without a little research. Being that the 340 & 360 use the same rod length, and deck height from crank centerline to head face, but have different stroke. This would indicate that they adjusted for the compression in the piston. You have to look at the dimension from the centerline of the wrist pin to the top of the piston dome (piston compression height) to determine how or if they would work in a 340. My initial thought is that the 360 pistons are shorter than the 340 (given the same compression and difference in stroke). This would mean that the 340's need a higher compression height on the piston to get the same compression as the 360. So these should have lower compression in a 340 than a 360. I can't tell you how much without digging into the books and doing some calculations.

 

[pishta]

3.31 and 3.58 are the stroke difference in a 340 and a 360, take difference (.27) , divide by 2 (.135) and you have a ballpark compression height disparity between the 2 pistons. Eg, a +.040 360 piston is going to have a shorter compression height by .135 (to compensate for the longer stroke) than a low comp 340 piston to have the same compression in the same bore with the same head. When you start adding compression height to a piston, your compression goes up rapidly. You get the idea.

 

[krazykuda]

3.31 and 3.58 are the stroke difference in a 340 and a 360, take difference (.27) , divide by 2 (.135) and you have a ballpark compression height disparity between the 2 pistons. Eg, a +.040 360 piston is going to have a shorter compression height by .135 (to compensate for the longer stroke) than a low comp 340 piston to have the same compression in the same bore with the same head. When you start adding compression height to a piston, your compression goes up rapidly. You get the idea.

Exactly. This is good information. Also keep in mind that these numbers are in "inches", when plugged into the pi*R(squared) for area of a circle, then times the 1/2 stroke height you get volume in CUBIC INCHES. Then you need to convert this to CUBIC CENTIMETERS to complete your compression calculations...

 

[red_srt10]

** $280 Shipped(US Only) **