Sbc pushrod question

J.R. Haddad · 12-15-2014, 06:38 PM

350 Stocker Engine, Hydraulic Roller, Roller Rockers, Lifters have
.050-.060 plunge. Max RPM 6800. Question: Will there be a measureable
difference between 5/16 .080 wall pushrods vs. 3/8 .120 wall
pushrods? I am getting pulled different ways depending on the source.
Thanks in advance guys. J.R.

Jim Hanig · 12-15-2014, 07:00 PM

Can,t go wrong with the heavier pushrods, but if you not run any spring pressure you can likely get buy with the 5/16 80 wall. You mite ck your lift with one then ck it with the other, if it the same run the 5/16.

Denny Steward · 12-15-2014, 09:08 PM

JR check out my website stewardperformance.com

Mark Yacavone · 12-15-2014, 09:19 PM

Denny, Do you feel a custom 5/16 push rod is a adequate for a high rpm SBC Stocker?
(200 / 400 # springs)

Denny Steward · 12-16-2014, 10:00 AM

Mark, a 5/16 .120 wall would be the least I would use on a SBC stocker engine.

Mark Yacavone · 12-16-2014, 01:40 PM

Quote:

Originally Posted by Denny Steward

Mark, a 5/16 .120 wall would be the least I would use on a SBC stocker engine.

Thanks
Next question (s)
Sounds like about a.070 oil passage ..Enough for roller rockers? Anybody go less? Possible?

Dwight Southerland · 12-16-2014, 01:49 PM

Quote:

Originally Posted by Mark Yacavone

Thanks
Next question (s)
Sounds like about a.070 oil passage ..Enough for roller rockers? Anybody go less? Possible?

You also have to lube the springs. The bearings in the trunnion of the rocker arm will operate on very little. I have run .025 on circle track engines with the right coating on the valve springs.

Mark Yacavone · 12-16-2014, 02:04 PM

Quote:

Originally Posted by Dwight Southerland

You also have to lube the springs. The bearings in the trunnion of the rocker arm will operate on very little. I have run .025 on circle track engines with the right coating on the valve springs.

Okay , coatings..Like?
Any experience without the coating?
I would assume you have to cool the springs to a certain degree too.
I also assume there's a fine mist of oil everywhere in there at higher rpm.

Mike Pearson · 12-16-2014, 02:16 PM

I wouldn't think you would have any problem at all running a good quality 5/16 pushrods with that spring pressure. I ran them on my super stock engines for years with much higher pressure with no failures. Just got some 7/16 for the engine I am puting in my car. It will be interesting to see if there is any difference from the 3/8 that I have been running. I have mostly used comp pushrods in the past.

Denny Steward · 12-16-2014, 02:31 PM

They will work just fine without coatings I have plenty of racers using them now with zero troubles at all.

12-15-2014, 06:38 PM	#1
J.R. Haddad Senior Member Join Date: Jun 2012 Posts: 624 Likes: 515 Liked 879 Times in 196 Posts	Sbc pushrod question 350 Stocker Engine, Hydraulic Roller, Roller Rockers, Lifters have .050-.060 plunge. Max RPM 6800. Question: Will there be a measureable difference between 5/16 .080 wall pushrods vs. 3/8 .120 wall pushrods? I am getting pulled different ways depending on the source. Thanks in advance guys. J.R.

12-15-2014, 07:00 PM	#2
Jim Hanig Senior Member Join Date: Aug 2006 Location: Pukwana SD Posts: 858 Likes: 555 Liked 97 Times in 47 Posts	Re: Sbc pushrod question Can,t go wrong with the heavier pushrods, but if you not run any spring pressure you can likely get buy with the 5/16 80 wall. You mite ck your lift with one then ck it with the other, if it the same run the 5/16.

12-15-2014, 09:08 PM	#3
Denny Steward Member Join Date: Oct 2002 Location: PORT ORANGE FL Posts: 273 Likes: 373 Liked 112 Times in 20 Posts	Re: Sbc pushrod question JR check out my website stewardperformance.com __________________ Denny Steward GT/JA 246

12-15-2014, 09:19 PM	#4
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,416 Likes: 2,582 Liked 4,453 Times in 1,694 Posts	Re: Sbc pushrod question Denny, Do you feel a custom 5/16 push rod is a adequate for a high rpm SBC Stocker? (200 / 400 # springs) __________________ We are lucky we don't get as much Government as we pay for..... Will Rogers

12-16-2014, 10:00 AM	#5
Denny Steward Member Join Date: Oct 2002 Location: PORT ORANGE FL Posts: 273 Likes: 373 Liked 112 Times in 20 Posts	Re: Sbc pushrod question Mark, a 5/16 .120 wall would be the least I would use on a SBC stocker engine. __________________ Denny Steward GT/JA 246

12-16-2014, 02:16 PM	#9
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,321 Likes: 546 Liked 1,629 Times in 502 Posts	Re: Sbc pushrod question I wouldn't think you would have any problem at all running a good quality 5/16 pushrods with that spring pressure. I ran them on my super stock engines for years with much higher pressure with no failures. Just got some 7/16 for the engine I am puting in my car. It will be interesting to see if there is any difference from the 3/8 that I have been running. I have mostly used comp pushrods in the past. __________________ Mike Pearson 2485 SS

12-16-2014, 02:31 PM	#10
Denny Steward Member Join Date: Oct 2002 Location: PORT ORANGE FL Posts: 273 Likes: 373 Liked 112 Times in 20 Posts	Re: Sbc pushrod question They will work just fine without coatings I have plenty of racers using them now with zero troubles at all. __________________ Denny Steward GT/JA 246