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#1
10-06-2007, 06:57 PM
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389 +.060 or 400 standard pistons
I'm looking for 389 +.060 or 400 standard pistons. Dished for a 9.5 to 1 compression or lower rebuild. My machinist said he could machine a dish in a set of flat top pistons but that would cost me another $150.00. I Checked with the big guys (Summit & Jeggs) and it sounds like the Keith Blacks are on back order.
Any ideas?  Thanks! bej |
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#2
10-06-2007, 08:50 PM
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I would post a wanted ad here for the pistons.I bought a set of 60 over 400 forged pistons here,slightly used and balanced!Worth a shot.
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#3
10-07-2007, 01:04 AM
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Keep in mind the heads and cam you will be using. 389s had a different valve angle than 400s did, thus the valve reliefs in the pistons are different. If you will be running a high lift cam this could be important.
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---------------------------- '72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car! '73 Firebird 350/4-speed Black on Black, mix & match. |
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#4
10-07-2007, 06:10 PM
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just dish the standard 400 forged pistons and then don't worry about the valve reliefs. dishing will remove reliefs.
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#5
10-07-2007, 06:59 PM
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I ran a 400 std piston on my 389 engine and checked the cam lift vs the piston position with a .590 lift camshaft. I still had lots of P/V clearance.
I really doubt if you would even come close to the piston with a stock camshaft and if you did a dish on the 400 piston, (lots of meat there) you would probably be very safe with even a high lift camshaft. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#6
10-07-2007, 08:39 PM
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Any ideas as to were to find a set of above said pistons?????
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#7
10-07-2007, 09:37 PM
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I might have a spare set on the shelf of new ones but they can still be bought. Mine are pretty dirty and the box is pretty old but I kept them as back-ups for my 389 engine.
I really do not want to part with them. They are out there. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#8
10-08-2007, 10:34 AM
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Yup, I know EXACTLY where they can be bought! That is, here or most other engine building shops in North America! Not rocket science. A "simple" dish is all that's needed. $150 labor to do that is about double what the job takes. Unless they're the new forgings, it's a GOOD thing, KBs aren't available. Get Speed Pro L2262F (std.) and dish them, and be done with it!
One thing to watch for: some 389 crankshafts have fatter counterweights than others, and can interfere with the piston skirt. This isn't usually a problem, but it must be "checked". Jim |
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