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Pin height difference between KB and Bulltear forged pistons
Posted: June 17th, 2015, 8:04 am
by nicpaige
Does anyone know the pin height differences between the KB 944 and the Bulltear stroker pistons?
Re: Pin height difference between KB and Bulltear forged pis
Posted: June 17th, 2015, 8:11 am
by 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.
Re: Pin height difference between KB and Bulltear forged pis
Posted: June 17th, 2015, 9:34 am
by 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
Re: Pin height difference between KB and Bulltear forged pis
Posted: June 17th, 2015, 10:18 am
by jsawduste
Thanks Russ
Re: Pin height difference between KB and Bulltear forged pis
Posted: June 18th, 2015, 2:12 am
by Cheromaniac
nicpaige wrote: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.
Re: Pin height difference between KB and Bulltear forged pis
Posted: June 18th, 2015, 5:48 am
by 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.