1970 LS-6 Pistons [Archive] - The Supercar Registry

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Big Block Bill

10-14-2010, 07:18 PM

Anyone have a source for .030 11:25 to 1 closed chamber, forged pistons for a LS-6 I am doing? Any options would be appreciated.

Thanks,
Bill Pankiw

VintageMusclecar

10-14-2010, 07:30 PM

Click here (http://www.probeindustries.com/Chevy_454_18_0cc_Dome_Top_FPS_Pistons_p/p2465f.htm)

Eric

Big Block Bill

10-15-2010, 02:47 AM

Eric,

They show the part # P2465-030 as a 10.44 to 1 compression piston using a correct closed chamber 106 CC / "291" head. I thought a LS-6 had a true 11.25 to 1 compression ratio? Any input?

Thanks,
Bill

VintageMusclecar

10-15-2010, 03:00 AM

You are correct. I got my part numbers crossed up.

Try these instead (http://www.kb-silvolite.com/icon/icon.php?action=details&P_id=367)

Eric

Big Block Bill

10-15-2010, 03:18 AM

Thanks Eric,

Have you had experience with this company? This is a frame off project, and I want it to be 100% correct & reliable.

Bill

SuperNovaSS

10-15-2010, 03:41 AM

Do you want to be the correct compression ratio on paper or the actual correct piston? I don't know about LS6's but I believe L78s and L72 are much less compression than GM advertised.

Jason

VintageMusclecar

10-15-2010, 05:30 AM

I have Probe pistons in my current 496 and I have a set of KB units slated to go into another project. Both sets were of very good quality, but the pin fit on the KB's seems to be better (Probes were a bit tight). I would probably lean towards the KB's in the future, but as is the case with any aftermarket components, it's up to the end user to verify everything is to spec.

Hope that helps.
Eric

10-15-2010, 11:02 PM

Hi Bill. I think there are a <span style="text-decoration: underline">lot</span> better (quality <<GRAEMLIN_URL>>/cool.gif ) choices than those given. Plenty of those companies offer pistons designed for NHRA Stock Eliminator, which has some rather stringent "stock" specs. CP and possibly JE or Diamond come to mind immediately. I've spoken to CP at length regarding the possibility of using their Stocker pistons in a street driven car. Ditto with the possibility of using a modern ring configuration in a older engine. There's no reason (aside from $$$, which isn't outrageous) why it can't be done.

Wayne