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FS: 68-69 400 Forged Pistons +.040

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Old December 29th, 2013, 12:04 PM
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FS: 68-69 400 Forged Pistons +.040
Set of 8 slightly used SpeedPro L2346F +.040 oversize forged pistons for 68/69 400 engines. These pistons have approximately 3 hours of run time. $250.00 plus shipping.

Brian
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Old January 3rd, 2014, 01:37 PM
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Old January 22nd, 2014, 03:57 PM
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Old January 24th, 2014, 06:22 AM
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Interested in any trades? I have a ton of 68-72 parts and performance parts.
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Old January 24th, 2014, 07:46 AM
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Originally Posted by fearthisrocket
Interested in any trades? I have a ton of 68-72 parts and performance parts.
Thanks for the offer but I'm just interested in selling them. I'm trying to sell off some of what I have left over from a few restoration projects. Offers are always welcome.
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Old February 22nd, 2014, 06:21 AM
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Old February 22nd, 2014, 07:23 AM
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This may be a dumb question, but will these be suitable for my 68 400...without a lot of mods?
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Old February 22nd, 2014, 07:33 AM
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Yes sir, the '68 and '69 G400's differ only in the casting date and exact VIN stamp.
They are essentially all the same enigne. Pistons may be low or high compression, cams vary, intakes vary, but the block, crank, rods, piston sets are all the same.
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Old February 22nd, 2014, 08:47 AM
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Originally Posted by sammy
This may be a dumb question, but will these be suitable for my 68 400...without a lot of mods?
As already mentioned, they will work with your motor if your block would be bored .040 over the stock bore size. They are the same compression ratio as stock which is either 10.25 or 10.5.

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Old February 22nd, 2014, 09:12 AM
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Fyi
Originally Posted by 69442C
As already mentioned, they will work with your motor if your block would be bored .040 over the stock bore size. They are the same compression ratio as stock which is either 10.25 or 10.5.

Brian

They are only the same compression if you use the stock OEM 0.017" head gaskets which no one makes. You will need to factor in the thickness of the gasket used when calculating your final compression ratio with these pistons.


Bump for a good set of pistons at a very fair price. Good luck with the sale.
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Old February 22nd, 2014, 11:52 AM
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Originally Posted by oldsmobiledave
They are only the same compression if you use the stock OEM 0.017" head gaskets which no one makes. You will need to factor in the thickness of the gasket used when calculating your final compression ratio with these pistons.


Bump for a good set of pistons at a very fair price. Good luck with the sale.
Thanks for the clarification. I was referring more towards how the pistons are listed in the parts book but I understand how that can also be misleading based on the other factors. Having a thicker head gasket to knock the compression down a little for street use would probably be a good thing unless someone was building for power.

Hopefully someone can use them.

Brian
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Old February 22nd, 2014, 04:26 PM
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Anyone know if an .040 bore on a '68 400 is risky (is there enough material in cylinder?)
These might be a good solution for the 400 I have with a rusty cylinder from blown head gasket decades ago.
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Old February 22nd, 2014, 05:06 PM
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Originally Posted by shamusj
Anyone know if an .040 bore on a '68 400 is risky (is there enough material in cylinder?)
These might be a good solution for the 400 I have with a rusty cylinder from blown head gasket decades ago.
.040 overbore on your 400 is not an issue at all. I had a 69 400 bored .040 (where these came from) and the shop didn't have the slightest concern. I believe I have seen .060 pistons offered for these motors.

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Old February 22nd, 2014, 07:22 PM
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pffft

I think the walls are so thick on the puny bore G400 that a 0.400 overbore is possible
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Old February 28th, 2014, 01:48 PM
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Old March 3rd, 2014, 01:21 PM
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Do you still have these pistons?
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Old March 3rd, 2014, 01:24 PM
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Yes, I do.
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Old March 3rd, 2014, 02:11 PM
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Price still 250 plus shipping? Would be shipped to zip 38018 Cordova Tn
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Old March 3rd, 2014, 02:13 PM
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Also on market for crankshaft cast is fine 455/400 if you here of one out there
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Old March 3rd, 2014, 02:28 PM
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$270 shipped to you. I don't have a crank, sorry.
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Old March 4th, 2014, 05:28 PM
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Trying to come up with the cash if you sell them before I get it my lose Thanks
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Old March 15th, 2014, 04:42 PM
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Old March 25th, 2014, 08:50 AM
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Old April 5th, 2014, 09:28 AM
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Sold!
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Old April 5th, 2014, 07:34 PM
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Originally Posted by 69442C
Sold!
Thanks for update had to go .060 to clean mine up
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