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#1 |
454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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454 Push Rod
Bought a replacement PR today, took the old bent one with me as I know nothing about these things...except that they push
![]() Am I OK to use this? I thought you had to be exact with these things...he did say that I could just tighten down the rocker further to take up the difference.
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Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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#2 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: 454 Push Rod
The push rods should be the same length. With a shorter rod the contact of the rocker on the valve stem will be moved toward the pushrod instead of being centered on the valve. Not a good situation. (This assumes that the contact on the valves are centered using the pushrods on the other valves). You might have a case where the push rods have been replaced at one time with longer ones to match the cam lift.
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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#3 |
454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: 454 Push Rod
Thanks Jim, I wish I understood the science behind all this, I've been busy Googling trying to find out how you tell the difference between exhaust and intake rods....not that I would understand if I did know the difference.
![]() I have also noticed that two of the shorter rods on the DS are newer, so figuring that those are recent replacements I measured them against my new one and they are the same length, go figure, maybe I should just get a complete new set of rods...but then I have no idea how to go about finding out which is the correct set i'll need. There are two rod sizes, 8 1/4" & 9 1/4" New rod on the far left, older replacement in the middle & bent one on the right....
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Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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#4 |
Registered User
Join Date: Oct 2008
Location: Perry OK
Posts: 121
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Re: 454 Push Rod
Do you know why the rod bent? Pushrods can be ordered in many custom sizes, do you know the history of the motor? Did someone possibly install longer pushrods? If there has been custom head or block work that could also effect the length requirement of the PR. Such as if the heads have been milled or the block decked and squared. If all of these are unknowns get yourself a Pushrod length checker and measure what rod you need and order it. It could be that too long of a rod was installed and caused the bend in high RPM?
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#5 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,734
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Re: 454 Push Rod
May be time to order up a new set. Without knowing the specs on your engine you should determine if you can use stock or not. Why have the others been changed over time? Have they bent also?
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#6 | |
454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: 454 Push Rod
Quote:
![]() It's definately got a mild Comp Cam in there Eric that much is sure, when I removed the pan a couple of years ago I found a whole bunch of broken bits in there so now i'm seeing whats up top it does tie in with what was in the pan.
__________________
Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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#7 |
Senior Member
![]() Join Date: Mar 2009
Location: Brigantine NJ
Posts: 820
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Re: 454 Push Rod
Um, after seeing that last pick I am amazed that the motor runs at all. That is pretty serious to have lifters in the oil pan. If it were mine I would pull the motor at this point to see what really happened in there.
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Jeremy 1969 Blazer 4x4 original cst 1971 Blazer partial 2wd convert 1972 Blazer 4x4 original cst 1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper 1970 4x4 suburban w/ 6in lift and 35in tires 1968 Corvette convertible 1970 Malibu convertible 1959 Brookwood wagon 1972 International Scout ii |
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#8 |
Registered User
![]() Join Date: Sep 2003
Location: DFW
Posts: 765
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Re: 454 Push Rod
uh, i dont think those are lifters, apears to be the oil pump driveshaft retainer ring,pieces if cam gear (original style) and pieces of pushrod ends (tube and balls).
really need something to gauge size by, like a ruler or coin. all in all does not look promising |
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#9 | |
454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: 454 Push Rod
Quote:
__________________
Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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#10 |
Registered User
![]() Join Date: Sep 2003
Location: DFW
Posts: 765
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Re: 454 Push Rod
something about 30 years or so of experience....lol
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