Re: Who's push rods?
[Re: justinp61]
#1971641
12/17/15 08:34 PM
12/17/15 08:34 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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There is no way I would use anything smaller than 3/8 with that. No way. And they SHOULD be 3/8-7/16 double taper. Didn't anyone say that?
I don't care for the 5/16 .120 walls I have with 145 on the seat.
EDIT On second thought, you MAY get by with a 5/16-3/8 single taper. But that would be a .120 wall min.
Last edited by madscientist; 12/17/15 08:59 PM.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Who's push rods?
[Re: justinp61]
#1971664
12/17/15 09:01 PM
12/17/15 09:01 PM
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Joined: Jan 2003
Posts: 6,266 Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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7.8" 5/16 .120 wall Smith Brothers on my old engine.
250# on the seat 600# open @.640 lift
7000 RPM, T&D rockers. 600 runs in 3 seasons with no issues.
Bigger is better and stiffer, but if you can't fit it, I wouldn't be scared of the smaller pushrod.
-Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA
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Re: Who's push rods?
[Re: justinp61]
#1971691
12/17/15 09:42 PM
12/17/15 09:42 PM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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I have some Manton 4 Series 11/32 x .120 wall 7.605/7.640 length push rods that I had on another motor with 360-2 heads that have about 15 passes on them. The engine broke a rod. If they will work I will sell them cheap.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: Who's push rods?
[Re: D-50]
#1971696
12/17/15 09:59 PM
12/17/15 09:59 PM
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Joined: May 2006
Posts: 1,075 oregon
greendart408
super stock
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super stock
Joined: May 2006
Posts: 1,075
oregon
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I run 3/8s x.120 smith bro's, in my uncles engine that's in my car, only brand we have ever ran, no issues. 360-1s, had to grind.... I might have got a 7/16s in there, which we wanted, was way thin already tho. 1.8 jesels, .800 plus lift cam, 330 and 810 pressures, if I remember correctly without looking at pressures.
Last edited by greendart408; 12/17/15 10:02 PM.
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Re: Who's push rods?
[Re: D-50]
#1971699
12/17/15 10:08 PM
12/17/15 10:08 PM
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Joined: Oct 2003
Posts: 11,686 W. Kentucky
justinp61
OP
I Live Here
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OP
I Live Here
Joined: Oct 2003
Posts: 11,686
W. Kentucky
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I have some Manton 4 Series 11/32 x .120 wall 7.605/7.640 length push rods that I had on another motor with 360-2 heads that have about 15 passes on them. The engine broke a rod. If they will work I will sell them cheap. Ball, Ball? The exhaust are a right but the intakes are a little long. I've only measured one side will try to get the other side measured tomorrow.
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Re: Who's push rods?
[Re: justinp61]
#1971704
12/17/15 10:13 PM
12/17/15 10:13 PM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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I have some Manton 4 Series 11/32 x .120 wall 7.605/7.640 length push rods that I had on another motor with 360-2 heads that have about 15 passes on them. The engine broke a rod. If they will work I will sell them cheap. Ball, Ball? The exhaust are a right but the intakes are a little long. I've only measured one side will try to get the other side measured tomorrow. Yes, Ball-Ball..
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: Who's push rods?
[Re: justinp61]
#1971940
12/18/15 02:50 AM
12/18/15 02:50 AM
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Joined: Aug 2011
Posts: 2,872 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,872
Pattison Texas
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Trend made mine , any length that i needed.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Who's push rods?
[Re: CSK]
#1971952
12/18/15 03:10 AM
12/18/15 03:10 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I have used Trend, Smith Bro, and a local copany to me.. they make what I want in straight PRs.. its called OEM.. I never had any bend or break.. but Smith Bro were way pricer than Trend and way more than OEM... OEM makes Comp Cams PRs EDIT its a small place but the guy took me in back to show me around and I was watching the one machine putting the Comp Cams name and length on them going into boxes.. pretty simple process on PRs but they do nice stuff
Last edited by MR_P_BODY; 12/18/15 03:14 AM.
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Re: Who's push rods?
[Re: justinp61]
#1971958
12/18/15 03:16 AM
12/18/15 03:16 AM
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Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,213
New York
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"Not enough pushrod" doesn't always produce results that are easy to see and diagnose. A limber pushrod acts like pole doing a pole-vault - it bends when the load vs. speed is too great, then snaps back to full length and overloads the spring. SpinTron is excellent in diagnosing this, but it's cheaper to just use the biggest diameter you can fit. Sometimes, it isn't float or breakage - it's a soft spot in the RPM range you use that goes away when the pushrod is stiffer (not stronger).
Boffin Emeritus
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