Pin height difference between KB and Bulltear forged pistons

[nicpaige]

Does anyone know the pin height differences between the KB 944 and the Bulltear stroker pistons?

[jsawduste]

Off the top of my head for off the shelf pistons it would be .040. Off the record the Eagle rods were supposed to be mated to the KB`s. The Eagles are .020 longer then stock. A stock rod leaves the piston down .020 in the hole. Rod length and piston height gives me the .040

By rights if the BT`s are truly custom you should be able to spec the pin height.

[Russ Pottenger]

What John said ^

The Icon 944 piston has a cd of 1.353 with a stock pin dia of .931
When doing a custom piston you can put the pin wherever, and whatever you want.
A option I do in many of the strokers I do is order the piston with a Chevy .927 pin and bush
the rod for a full floating pin.


Russ

[jsawduste]

Thanks Russ

[Cheromaniac]

Does anyone know the pin height differences between the KB 944 and the Bulltear stroker pistons?

The IC944s have a pin height of 1.353" and, when used with 4.0L rods, are ~0.027" down the hole at TDC in a standard 4.0L block.
If you want a zero deck clearance, you could spec Bulltear pistons with a 1.380" pin height to use with 6.125" 4.0L rods and avoid the need to mill the block deck.
Another more expensive alternative is to get a set of Eagle 6.150" forged rods (not easy to find as they're no longer made) and use IC944 pistons that are modified to accept 0.912" full-floating pins. This would leave the pistons only ~0.002" down the hole at TDC.

[jsawduste]

Dino, your math is better then mine. Getting old and senile. :mrgreen:

That said, finding a set of Eagles might be tough. I`ve been looking and have only found 1 vendor that MIGHT have a set.

There are several SBC rods that could work but the big end is too narrow. Have seen folks machine a bronze spacer for the pin to center the rod from the small end. Not sure I like that idea yet.