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Re: 273 rocker arms?
[Re: andy3965]
#660265
04/03/10 11:16 PM
04/03/10 11:16 PM
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Joined: Mar 2010
Posts: 162
monticello,ms
andy3965
OP
member
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OP
member
Joined: Mar 2010
Posts: 162
monticello,ms
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anybody used 273 rockers before? just wondering how they worked without locknuts to keep them locked down.
MOPAR BORN,MOPAR BRED,AND WHEN I DIE I'LL BE MOPAR DEAD!!!
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Re: 273 rocker arms?
[Re: andy3965]
#660266
04/03/10 11:47 PM
04/03/10 11:47 PM
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Joined: Jan 2003
Posts: 8,035
Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,035
Tulsa OK
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I have used them but I bought a kit from mopar perfomance that allowed them to have a regular adjuster and locknut setup. I ran them with a small solid roller and they did fine. I sold them to a member on here and I think he is still using them. I did install the chrome shafts from mancinis IIRC.
68 Barracuda Formula S 340
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Re: 273 rocker arms?
[Re: andy3965]
#660267
04/03/10 11:52 PM
04/03/10 11:52 PM
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Joined: Dec 2008
Posts: 176
Rome, GA
GTXX
member
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member
Joined: Dec 2008
Posts: 176
Rome, GA
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an interferance fit on the threads kept them in place. if they were adjusted alot the threads could loosen up, changeing them to use jam nuts is a good idea
'71 GTX w/Air Grabber, Super Trak Pak, Spoiler Pkg. been apart for 22 years, thinking it's time to do something about that....
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Re: 273 rocker arms?
[Re: Bad340fish]
#660268
04/03/10 11:53 PM
04/03/10 11:53 PM
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Joined: Mar 2003
Posts: 2,527
PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,527
PA
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Have a set on my old car and we used the adjuster and locknuts on them also.
Ran my old 360 in it with stock adjusters for years with a hydraulic cam but I did have a couple back off on it a few times.
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
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Re: 273 rocker arms?
[Re: moparacer]
#660269
04/04/10 01:02 AM
04/04/10 01:02 AM
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Joined: Mar 2010
Posts: 162
monticello,ms
andy3965
OP
member
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OP
member
Joined: Mar 2010
Posts: 162
monticello,ms
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thanks guys,i will have to see if i can find this kit ya'll talkin 'bout.
MOPAR BORN,MOPAR BRED,AND WHEN I DIE I'LL BE MOPAR DEAD!!!
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Re: 273 rocker arms?
[Re: JBurch]
#660274
04/05/10 08:04 AM
04/05/10 08:04 AM
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Joined: Aug 2003
Posts: 4,991
new jersey usa
11secdart
master
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master
Joined: Aug 2003
Posts: 4,991
new jersey usa
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I ran them for years on my 340s and never had a problem. A lot better than the stock stamped steel rockers of which I did break a few.
Last edited by 11secdart; 04/05/10 08:05 AM.
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Re: 273 rocker arms?
[Re: 11secdart]
#660275
04/05/10 08:00 PM
04/05/10 08:00 PM
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Joined: Mar 2010
Posts: 162
monticello,ms
andy3965
OP
member
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OP
member
Joined: Mar 2010
Posts: 162
monticello,ms
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well i found a kit at mancinis,$95 but out of stock.been out for awhile.i will probably run them like they are.does anybody know the true ratio of these rockers?i know they should be 1.5 but i figure the stock stuff is probably not a true 1.5.
MOPAR BORN,MOPAR BRED,AND WHEN I DIE I'LL BE MOPAR DEAD!!!
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Re: 273 rocker arms?
[Re: RodStRace]
#660277
04/05/10 10:57 PM
04/05/10 10:57 PM
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Joined: Jan 2005
Posts: 3,635
Oakland, MI
dizuster
master
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master
Joined: Jan 2005
Posts: 3,635
Oakland, MI
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I used to run them on my 340, solid cam motor. The adjusters used to back off. I tried different adjusters, different rocker arms, etc... after a while, they all just seemed to keep backing off.
You can have a local machinist spot face them for you, then you can run a jam nut... good idea to do the swap.
The interference fit is just a bad idea (especially on vibrating/moving parts). That's why every aftermarket mopar rocker arm built today has a jamb nut.
On a side note, I work for a very large automotive supplier (5+ Billion in sales). Under no circumstance can we use an interference type locking fastener on ANYTHING. They are just too high of a risk to loosen up...
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Re: 273 rocker arms?
[Re: andy3965]
#660280
11/14/12 05:15 AM
11/14/12 05:15 AM
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Joined: Aug 2003
Posts: 43,303
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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Quote:
well i found a kit at mancinis,$95 but out of stock.been out for awhile.i will probably run them like they are.does anybody know the true ratio of these rockers?i know they should be 1.5 but i figure the stock stuff is probably not a true 1.5.
I built a legal 1971 340 NHRA E/SA motor several years back when you had to use the stock type ductile iron rockers in stock, the owner had over 100 273 rockers, I set every one of them up on one side of his motor and checked them with solid lifters and checking valve springs, them rascals where horrible on the ratio, from very low to very high. He ended up having me build two motors so I needed 32 legal rocker arms, we ended up buying a set of Isky to get one more leagl rocker for the first motor and went throough five more sets of them to get the final 8 rockers to have two matching legal sets  I hadn't heard of RAS at that time  I did end up using them to blueprint some ductile iron BB rockers several years later  IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 273 rocker arms?
[Re: RodStRace]
#660282
11/14/12 11:25 AM
11/14/12 11:25 AM
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Joined: Feb 2003
Posts: 8,020
Pangaea
B5 Bee
master
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master
Joined: Feb 2003
Posts: 8,020
Pangaea
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Quote:
One more little thing, if you are running a hyd. cam, you need different pushrods. Crower had 'em for me way back before the interwebs, there may be other sources now. 
Back in the early '80s, I had a set on a 340 and with a purple shaft 474 'Hemi grind'. I went to NAPA and ordered a set of '70 340-6 push rods, I think they were Speed Pros, probably no longer available.
For lock adjusters, I used a set from Crane Cams. I ran a tap thru the rocker to eliminate the interference fit so they were easy to turn while setting the pre-load.
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