393 Stroker Piston Clearance Problems.. Please Help!!
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New User
Joined: Jul 2009
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393 Stroker Piston Clearance Problems.. Please Help!!
Hello All,
I am in the middle of a 393 stroker build. I have a 3.85" Scat crank and I am using Speed Pro .030 over pistons. I installed the first 2 pistons and found that when rotating the crank the counterweights on the crank just touch the bottom of the piston skirts at the bottom of the stroke. I was first using 302 pistons and thought I messed up, but now I just purchased 351 pistons and the problem still exists. Any help is greatly appreciated as I am running out of patience.
Thanks in advance..
I am in the middle of a 393 stroker build. I have a 3.85" Scat crank and I am using Speed Pro .030 over pistons. I installed the first 2 pistons and found that when rotating the crank the counterweights on the crank just touch the bottom of the piston skirts at the bottom of the stroke. I was first using 302 pistons and thought I messed up, but now I just purchased 351 pistons and the problem still exists. Any help is greatly appreciated as I am running out of patience.
Thanks in advance..
Senior User
Joined: Feb 2006
Posts: 216
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From: cleveland,Oh.
You have a 3.85 crank, 6.2 rods, with 302 pistons. I have read this is the formula for a 393. You may have to do some notching on the piston skirts, are you using stock 302compression height pistons?
Cargo Master
Joined: May 2007
Posts: 2,071
Likes: 36
From: British Columbia
The 351 pistons are almost certainly wrong for this application. I believe this crank is to be used with the stock 351W rods (5.956" long) and stock type 302 pistons.
What part number are the 302 pistons you have?
What connecting rods are you using?
What part number are the 302 pistons you have?
What connecting rods are you using?
Posting Guru
Joined: Aug 2009
Posts: 2,165
Likes: 0
From: Union Lake MI
`
2X stock 351 truck rods are the best. I have a set I will trade ya for the 6.200's or I could trade ya my 3.75 Eagle stroker crank for your 3.85 crank. It is made for 6.200 rods.
& I do not have any 6.200 rods yet...
Lookin for some if anyone has some. I beams will do
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