Which rod bolts for "thumb rods" - Team Camaro Tech
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post #1 of 11 (permalink) Old Mar 26th, 08, 03:06 PM Thread Starter
 
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Which rod bolts for "thumb rods"

I have a set of thumb rods I need to have rebuilt, what connecting rod bolts should I use?
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post #2 of 11 (permalink) Old Mar 26th, 08, 04:01 PM
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george
 
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Re: Which rod bolts for "thumb rods"

I used the 3/8ths arp wave locs.About $60 for a set of 16.they are offered in 7/16ths as well.These fasteners and thumb rods are plenty strong for street/strip usage.

George
68 Camaro
8-71 blown 461 Rat on E-85
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post #3 of 11 (permalink) Old Mar 26th, 08, 04:43 PM
 
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Re: Which rod bolts for "thumb rods"

8740 steel, 190,000 psi strength bolts will do you fine, imho.

I want to say by HPX. Or is it Milodon? And ARP are FINE too. Pioneer??

PAW may still sell their house brand?

pdq67



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post #4 of 11 (permalink) Old Mar 26th, 08, 05:35 PM
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Bill
 
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Re: Which rod bolts for "thumb rods"

Bob,
For the price of a new set of Scat rods, it almost does not make sense to waste money on your stock ones. If all you were going to do was resize them and keep the original bolts, I could maybe see it. But to add another $60 for bolts to put in a set of stock rods ...... personally I think its a waste of money. Summit has the Scat I beam rods with ARP bolts for $239. I dont know if machine work is a lot cheaper down your way but I get $120 to do a set of rods, plus the bolts ...............

Bill Koustenis
Owner
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


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post #5 of 11 (permalink) Old Mar 26th, 08, 08:30 PM
 
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Re: Which rod bolts for "thumb rods"

I agree with Bill. Sometimes its just a good idea to go with new stuff. They have already had all machine work done. Some times the new stuff is cheaper than haven old stuff redone....
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post #6 of 11 (permalink) Old Mar 26th, 08, 11:11 PM
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Lonnie
 
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Re: Which rod bolts for "thumb rods"

flatlanderracing.com has good prices too.

67 Camaro [email protected], [email protected], 1.455 60ft 421sbc
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post #7 of 11 (permalink) Old Mar 27th, 08, 04:44 AM
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Gary
 
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Re: Which rod bolts for "thumb rods"

Get ahold of Mike Lewis (Wolfplace) on the Chevelles.com site. His prices generally beat Summits and he'd a stand-up guy to deal with.

Gary Adrian
FCS Harmony Racing

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post #8 of 11 (permalink) Old Mar 27th, 08, 07:19 AM
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Re: Which rod bolts for "thumb rods"

What are "thumb" rods? Thumb are good, thumb are bad?
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post #9 of 11 (permalink) Old Mar 27th, 08, 08:53 AM
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Gary
 
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Re: Which rod bolts for "thumb rods"

Thumb are good. Also called truck rods. The scallop in the beam is rounded on the big end versus "Y" shaped like a conventional rod. If you hold the rod in your hand with the big end facing up, your thumb fits exactly into the rounded scallop in the end of the rod. That's supposedly where they got their name. The extra material makes the big ends less prone to getting knocked out of round.

Gary Adrian
FCS Harmony Racing

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post #10 of 11 (permalink) Old Mar 27th, 08, 09:15 AM
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Thumbs up Re: Which rod bolts for "thumb rods"

Quote:
Originally Posted by onovakind67 View Post
What are "thumb" rods? Thumb are good, thumb are bad?
'Thumb' of them can be good street-performance rods with good bolts and resizing
They cost me @$125~150 a set to do and work great for up to 500~600HP and @6.5K RPM - well within the operating limits for a good street motor.
They are used in most of the GM Industrial/Marine BB engines and I use them in the majority of BB marine engines I build.
An aftermarket set is a good idea if going for 650(+) HP - but, these will perform as good/or better than most the $250 replacement rods available from the aftermarket.
You are gonna have to spend $400~500+ for a better set of rods than these

Here a set of these BB truck rods Click image for larger version

Name:	BB Truck thumb-rod set.jpg
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ID:	6034

1968 Convertible
Some trucks
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Other V8 things - some of which float
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Other V6 things - none of which float
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Oh yeah, and 1 "Straight-Six" ...
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Last edited by Vintage 68; Mar 27th, 08 at 09:25 AM.
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post #11 of 11 (permalink) Old Mar 27th, 08, 05:07 PM
 
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Re: Which rod bolts for "thumb rods"

I'm w/ John here.

FOR the money...

You go out of their safe operating range, then buy better is all here.

And my 496 has them in it only b/c I self-limited my rpm to 6,000 rpm or less by CAM choice!

pdq67



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