Olds Piston Info??????

Caperat · 04-14-2009, 07:59 AM

Does anyone out there have any idea what this piston # identifys. It should be a TRW or Speed Pro item if i'm at least on track. Its a forged .030 over # L2278P. --- Thankyou.

Alan Roehrich · 04-14-2009, 08:13 AM

I think (going by memory) that is the old deep dish 455 piston. Should be around 4.120" diameter, plus whatever over size is marked, have a deep dish (maybe 0.250" deep, and almost the full diameter of the top of the piston), 5/64" compression ring grooves, a 3/16" oil ring groove, and compression height should be around 1.760" (going off of memory), with a 0.980" pin. Useless for anything but a very low compression engine, around 8:1 or so, unless you deck the block a bunch, and mill the heads as well. It usually comes up about 0.060" in the hole on an undecked block.

Ken Haase · 04-14-2009, 12:07 PM

According to an old TRW catalog, a L2278F is a 350 Chev stroker piston with a compression height of 1.52". 3.562 stroke using 5.7 rod. I don't see any "P" suffixes, but this is a 'Performance Components' catalog and doesn't list any pistons that aren't forged. Hope this helps.

442OLDS · 04-14-2009, 08:46 PM

455 68-70 all 4-bbl. 1.710 0.980 5/64, 5/64, 3/16

2278P Sealed Power

04-14-2009, 07:59 AM	#1
Caperat Junior Member Join Date: Jun 2006 Location: CANADA Posts: 76 Likes: 0 Liked 0 Times in 0 Posts	Olds Piston Info?????? Does anyone out there have any idea what this piston # identifys. It should be a TRW or Speed Pro item if i'm at least on track. Its a forged .030 over # L2278P. --- Thankyou.

04-14-2009, 08:13 AM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,068 Likes: 1,502 Liked 1,642 Times in 379 Posts	Re: Olds Piston Info?????? I think (going by memory) that is the old deep dish 455 piston. Should be around 4.120" diameter, plus whatever over size is marked, have a deep dish (maybe 0.250" deep, and almost the full diameter of the top of the piston), 5/64" compression ring grooves, a 3/16" oil ring groove, and compression height should be around 1.760" (going off of memory), with a 0.980" pin. Useless for anything but a very low compression engine, around 8:1 or so, unless you deck the block a bunch, and mill the heads as well. It usually comes up about 0.060" in the hole on an undecked block. __________________ Alan Roehrich 212A G/S

04-14-2009, 12:07 PM	#3
Ken Haase Member Join Date: Mar 2007 Posts: 233 Likes: 0 Liked 1 Time in 1 Post	Re: Olds Piston Info?????? According to an old TRW catalog, a L2278F is a 350 Chev stroker piston with a compression height of 1.52". 3.562 stroke using 5.7 rod. I don't see any "P" suffixes, but this is a 'Performance Components' catalog and doesn't list any pistons that aren't forged. Hope this helps.

04-14-2009, 08:46 PM	#4
442OLDS VIP Member Join Date: Sep 2004 Location: Elgin,IL Posts: 1,338 Likes: 5 Liked 281 Times in 102 Posts	Re: Olds Piston Info?????? 455 68-70 all 4-bbl. 1.710 0.980 5/64, 5/64, 3/16 2278P Sealed Power Last edited by 442OLDS; 04-14-2009 at 08:52 PM.