PINK RODS, why bother??



PINK RODS, why bother??

Postby grumpyvette » January 27th, 2009, 1:27 pm

I was asked several times if chevys SBC (PINK RODS) were the HOT TICKET?? in building a performance sbc, well let me say that there decent STOCK CONNECTING RODS, but they are not now nearly the (HOT TICKET)
THIS INFO WAS FOUND HERE

http://www.gmpartsdirect.com/performanc ... D=847.html
(so theres no sense in my repeating what these guys posted)

http://www.camaros.net/forums/showthread.php?t=150031

http://www.youtube.com/watch?v=cJJI9bml ... re=related

"Original late version 1968 and 1969 Pink Rods #3973386 are shot peened select forgings that are Full Floating on the wrist pin and the small ends are lead babbit ed, they have a "O" on the cap. The small ends have no oiling hole. They are easily identified by the pink paint that was on the beams, after years of use it also appears like dull white? The caps of original 69/70/71/72 pink rods are a different color as the rod is shot peened and the cap is not. This is easily seen on known original pink rods. By the way 1970 and up rods are pressed pin.
"O" rods that came in trucks and passenger car engines have the same "O" designator but are not shot peened and have pressed pins and no pink paint.
The Original "O" pink rods were discontinued from GM circa 1973/74 and the part number was superseded to the 72/73/74 version Z28 rod, which has a "B" on the cap and is a pressed pin rod, they also appear with the Pink paint. I have taken apart many Z28 302/350 and Corvette LT1 & L82 Engines over the last 40 years and this was always found.
I personally believe that "X" rods did not appear from GM until around late 74, early 1975, and this comes from working at a performance machine shop for 10 years in the 70,s, ( 1972-1982) and a Corvette Shop for 20 years ( 1985-2005) and the first time I saw "X" rods was around the mid 70,s in truck and passenger car engines. There is also a version of a pink "X" rod and it was installed in L82 Corvette engines from 75-79 and it also had the pink paint as well as brown ( or tan ) and orange from time to time.
A performance rod was offered out of the GM power book in the 70, and 80,s and these rods had the pink designator paint, I believe GM did that to identify the shotpeend surfaces. These are usually "X" rods.
I constantly see so called pink rods on ebay and just laugh when they have the applied pink paint and "X" on the caps."

"Mike, 70 LT1 engines DEFIANTLY do not use "X" rods. I have a 6,000 mile 1970 Z28 LT1 that has been discussed heavily a few years back on the Yenko site ( pictures are there also) and it has "O" pink rods. The engine was out of a rolled over Z28 that was scrapped 38 years ago. The fellow I got it from seperated the pan from the block because it got dented when the car crashed. The pan was repaired and is just bolted back on the engine assembly. The rest of the engine has never been apart. This is the reason I know it has "O" Pink rods.
Anyway someone must have been in your LT1 before if it has "X" rods. IMO. It is a well known fact that a lot of unscrupulous people robbed desirable high performance parts out of High Perf engines either intentionally or by ignorance if the engine was rebuilt.
As I stated the original "O" pink rods where select forgings. GM looked over all the rods for core shift, casting slag etc., then I have heard they magna flux particle inspected and shot peened the rod and also machined it and lead babbitted the small end for the full floating wrist pin ( in 69 engines only ) It was then finished machined and given the "pink" color on the beam of the rod.
I would use the "O" rods you have and have them magna fluxed particle inspected for any cracks etc, then have them shot peened and re sized with the ARP bolts. Some guys will grind the casting flash off the beams, but if you are concerned about originality then leave them stock. A word of caution, whoever shot peens them must protect the bores and the machined sides of the rods as the shot peening will rough these areas up excessively. There is also a Almen Specification for the rod surfaces to achieve the correct surface finish. It is checked with a Almen Strip to measure Arch height (the amount of upward deflection of an Almen strip after it has been submitted to a shot peen blast) Check with your local machine shops regarding shot peening etc.
Hope this helps. "




while I really appreciate the time, effort and knowledge posted above ,and the research it took. if your rebuilding a high performance sbc in todays world its a bit, of nearly useless, INFO, if your main goal is only building a strong yet cost effective rotating assembly, simply because theres forged 4340 steel rods with 7/16" ARP cap screw rods available at very competitive pricing, that are far stronger than the chevy "pink" rods

example


read
viewtopic.php?f=53&t=253

viewtopic.php?f=53&t=141

viewtopic.php?f=53&t=510

viewtopic.php?f=53&t=341

http://www.adperformance.com/index.php? ... ath=71_233

http://www.adperformance.com/index.php? ... x&cPath=67

http://www.adperformance.com/index.php? ... b4029cea6a
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: PINK RODS, why bother??

Postby grumpyvette » September 10th, 2009, 12:24 pm

should you reuse stock connecting rods?
I get that question constantly, everyone wants to save money and that's understandable,
Well ILL be the P.I.T.A. and point out that in most cases its rather silly to reuse stock SBC and MOST BBC connecting rods, that came with 3/8" rod bolts and Ill point out WHY.

connecting rods are one of the most highly stressed components in an engine, all highly stressed components WILL eventually fail, it might take hours or decades but it will eventually fail.
there are things you can do to increase service life expectancy, the rod bolts are the most likely part of the rod to fail, the rod bolt material and cross sectional area are critical,
average cost of decent ARP bolts, runs $50-$90

viewtopic.php?f=53&t=8541&p=29973#p29973
example
http://www.summitracing.com/parts/ARP-134-6403/

http://www.summitracing.com/parts/ARP-234-6301/

viewtopic.php?f=53&t=1856

viewtopic.php?f=53&t=8541

http://www.gmpartsdirect.com/performanc ... D=847.html
heres the famous CHEVY PINK RODS notice they are recommended for use at UNDER 500hp
12495071 Connecting Rod Kit (5.70")
This kit includes 8 of P/N 10108688 high quality 5.70" length PM connecting rods which are used in the LT1 and LT4 Corvette engine in place of the old "pink rod" for higher strength and reliability. These rods can be used in competition or as street rods below 500 horsepower. Use P/N 10108688 for single rod replacement.


I don,t know of ANY machine shop that will install the ARP bolts then re-size the rods and rebalanced the rods for under $150, and if you want the connecting rods polished and magnaflux checked your looking at $350 or more and even if they did in most cases your stuck using 3/8" bolts in comparatively weak connecting rods , because the stock rods are not designed for the larger 7/16" diameter rod bolts that are easily 200% stronger than the OEM 3/8" bolts,that you still need to use with a rotating assembly that needs to be rebalanced,so even without re balancing your looking at about $250 -$350 for used rods that in most cases have had many years of accumulated stress, and were only about 40%-60% as strong as AVERAGE aftermarket 4340 connecting rods with 7/16" rod bolts that don,t cost a great deal more
EXAMPLE

http://www.adperformance.com/index.php? ... cts_id=516

http://www.adperformance.com/index.php? ... cts_id=241

http://www.adperformance.com/index.php? ... cts_id=516

almost all decent 4340 forged steel connecting rods with 7/16" ARP bolts are easily 50%-200% stronger than a stock connecting rod with 3/8" stock rod bolts and that applied to BOTH the BBC and SBC to some degree
heres the famous CHEVY PINK RODS notice they are recommended for use at UNDER 500hp
12495071 Connecting Rod Kit (5.70")
This kit includes 8 of P/N 10108688 high quality 5.70" length PM connecting rods which are used in the LT1 and LT4 Corvette engine in place of the old "pink rod" for higher strength and reliability. These rods can be used in competition or as street rods below 500 horsepower. Use P/N 10108688 for single rod replacement.
http://www.gmpartsdirect.com/performanc ... D=847.html

GM PART # 12495071
CATEGORY: Engine Connecting Rod
PACK QTY: 1
CORE CHARGE: $0.00
[color:red]GM LIST: $357.14
OUR PRICE: $260.00
[/color]


compare,(seems like a NO BRAINER TO ME)

http://www.adperformance.com/index.php? ... cts_id=516

http://www.adperformance.com/index.php? ... cts_id=241


Will SUpport over 800+hp! Over 1000+ with a rod bolt upgrade (+$90.)

4340 Forged H-Beam Rods

Fully profiled for stroker engines.

Dowelled cap for precision fit.

All rods shipped w/ ARP 8740 bolts.

Precision sized & balanced

READ THESE THREADs

viewtopic.php?f=53&t=1168

viewtopic.php?f=53&t=510

viewtopic.php?f=53&t=510&p=633#p633
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: PINK RODS, why bother??

Postby grumpyvette » August 19th, 2010, 6:14 pm

"Does anyone bother to resize SBC or BBC connecting rods these days?"
Image
http://arp-bolts.com/pages/technical_failures.shtml
generally no,
on mild builds,or where I'm getting new pistons and a balance job any way,
heres why,check the price and what you get,
the rods and rod bolts are significantly stronger than well worn O.E.M. stock SBC components

SBC
just rods
http://www.adperformance.com/index.php?main_page=product_info&cPath=67_87_130&products_id=516

http://www.adperformance.com/index.php?main_page=product_info&cPath=67_87_130&products_id=515

rotating assembly
http://www.adperformance.com/index.php? ... cts_id=673

BBC, like a 496
rods
http://www.adperformance.com/index.php?main_page=product_info&cPath=67_87_130&products_id=520
rotating assembly
http://www.adperformance.com/index.php? ... cts_id=742
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

User avatar
Site Admin
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Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida


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