offset wrist pins

Dave1695 · 04-21-2011, 12:48 PM

Is it better to offset the wrist pin on a 350 Chevy engine, IN toward the center of the engine or OUT toward the exhaust manifold ? Is there an advantage to one over the other? Have asked a few racers and gotten varying answers.

Alan Roehrich · 04-21-2011, 04:14 PM

When running flat top pistons with symmetrical valve reliefs, we turned the arrow that indicated the front of the engine to the rear, offsetting the wrist pin to the exhaust side.

GTX JOHN · 04-21-2011, 06:36 PM

On our Mopar Stuff only the cast production style piston had an offset pin which we reversed on perf. stuff.... I have not noticed a pin offset on the forged stuff. Am I missing something because the pin appears to be centered?

Alan Roehrich · 04-21-2011, 08:22 PM

Some the forged replacement pistons do have a pin offset.

John Dinkel · 04-21-2011, 10:17 PM

Seems like I remember that the offset pins were to make the engines quiet on cold starts.
Reversing them would make a little more power. An old Indian trick I think.

Dan Lattimore · 04-22-2011, 08:28 AM

Quote:

Originally Posted by John Dinkel

Seems like I remember that the offset pins were to make the engines quiet on cold starts.
Reversing them would make a little more power. An old Indian trick I think.

John-------You are correct ! Go to the head of the class! I think that old Indian was called Smokey and had a unusual last name.

04-21-2011, 12:48 PM	#1
Dave1695 Member Join Date: May 2009 Posts: 160 Likes: 0 Liked 15 Times in 11 Posts	offset wrist pins Is it better to offset the wrist pin on a 350 Chevy engine, IN toward the center of the engine or OUT toward the exhaust manifold ? Is there an advantage to one over the other? Have asked a few racers and gotten varying answers.

04-21-2011, 04:14 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,116 Likes: 1,573 Liked 1,832 Times in 415 Posts	Re: offset wrist pins When running flat top pistons with symmetrical valve reliefs, we turned the arrow that indicated the front of the engine to the rear, offsetting the wrist pin to the exhaust side. __________________ Alan Roehrich 212A G/S

04-21-2011, 06:36 PM	#3
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,802 Liked 2,486 Times in 697 Posts	Re: offset wrist pins On our Mopar Stuff only the cast production style piston had an offset pin which we reversed on perf. stuff.... I have not noticed a pin offset on the forged stuff. Am I missing something because the pin appears to be centered?

04-21-2011, 08:22 PM	#4
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,116 Likes: 1,573 Liked 1,832 Times in 415 Posts	Re: offset wrist pins Some the forged replacement pistons do have a pin offset. __________________ Alan Roehrich 212A G/S

04-21-2011, 10:17 PM	#5
John Dinkel Senior Member Join Date: Nov 2005 Location: Pinckney, Michigan Posts: 507 Likes: 399 Liked 263 Times in 68 Posts	Re: offset wrist pins Seems like I remember that the offset pins were to make the engines quiet on cold starts. Reversing them would make a little more power. An old Indian trick I think. __________________ John Dinkel 3295 STK

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