Don - Vendor Help Please

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Wilson1

Well Known Member
Don - We had a thread going in the Full Size forum about me swapping a 348 back into my 60 to replace the ubiquitous 350.

A guy that pits down the row from me at the races happened to have a 409 crank he is willing to sell since he built his into a stroker. Now here is the question. You recommended the K_B Icon pistons, and mentioned you might be able to provide part numbers. Kool... I looked on there web site, but no 348 pistons listed.

I would like to have a compression ratio around 11:1 - I live at 4500 feet and won't be taking this car much lower. Also, i see a lot of people wanting to use the shorter 409 rod. Since I am a die hard drag racer, I would like to use the longest rod possible, and I am assuming the BBC rods will fit, if the width and pin works, so is there an off the shelf piston that will use a long rod? If so, how long? Normally the longer the rod the lighter the piston. (I happen to have a spare set of 6.385 Manleys sitting around and a used set of 6.135's)

Also, if I had to do a custom piston, I notice a few that will do it like Ross, and Diamond, which I have used both in BBC builds and they are great vendors, any special tricks you might have up your sleeve? I saw a picture of a Diamond with an unusual cut away in the chamber area... Flame travel?
 
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Don Jacks

Well Seasoned Member
Supporting Member 3
The place to look for the K-B Icons is Show-Cars.They list two .PN 7815 is the Icon piston that is listed for the 348 when using the 6.135 rod and a 4in.stroke.This is the one that I use with the 3.5[409 crank] and the 6.385 rod.They sell for 599.00 a set.The second one is PN 8935 ,is only availeable from Show Cars,and it's for a stock stroke 348,or you could use it with the shorter 409 rod[6.09] for a 380.It lists for 629.00 ,I don't know what the 8935 weighs,but the 7815's weighs 642 grams plus 149 for the pins.The cut away in those Diamonds was designed by a former member from here for use in the pistons that he sold as an exculsive deal through Ross.It was for flame travel.On a mild street set-up like this,I don't know how much help they would be.The 7815 is rated at 10.8 when using a 6.135 rod and a 4in.stroke crank.You'll lose some of that due to the shorter stroke crank,but I think that 10.2-10.5 should be attainable.
 
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427John

Well Known Member
Not to stomp on Don's toes but math says if you use the 348 4"stroke pistons with a 3.5" stroke 409 crank with +.250 rods which you have you should be good.KB/icon lists their 348 4"stroker piston as a 427.It's designed for use with 4" crank and 6.135 rods,its listed as 10.8 compression but may be less than that with the 3.5 stroke.Looks like he beat me to it.
 
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Wilson1

Well Known Member
Thanks Guys - So now the next real question with these funny deck motors (don't flame me please it is an attempt at humor) what is the real deck height measurement" 9.6 or 9.8"?
 
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