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Author Topic:   Rod Bolts
Dirt Maniac

Total posts: 103
posted April 11, 2005 07:21 PM  
Just wanted to here some opinions. My engine builder wants me to run 220000 lb. rod bolts instead of running ARP bolts, which are 190000 lb. bolts. I am running in a bomber class with a 406 and willnot be turning over 6200. Do I need to run these bolts? Also he wants me to run Beith Black pistons instead of Speedway Hyper's. The problem is he is at about $1800 already and we have a $300 claim rule. We only run 10 nights a year on this track. That is all we do for the year. Any advice? The extra cost of these two items is about another $250.00.

Dirt Maniac

Total posts: 196
posted April 11, 2005 07:45 PM  
Save your money...why run rod bolts that are stronger than the rod?

Dirt Forum Champ
Total posts: 968
posted April 11, 2005 08:06 PM  
Because, my friend, the rod bolts are smaller in diameter than the rod. More PSI/less SI
Many enging builders will protect their reputation at the expense of a customer. Suppose you walked in and said, lets make a cheap motor for this class and he put in cast pistons, an old set of rods, a chinese crank, and a camshaft that had been "laying around?" Then you run a couple laps, an old rod breas, turns the piston loose and the inside of your new motor looks like it's been in a blender..."that dang so and so can't build a motor worth a (blankety blank)"
If you knew what you wanted in the motor, why didn't you have your machinist prep the block and crank and assemble it would have saved some loot, but you wouldn't have anywhere to point the finger when it bought the farm.
BTW----I use ARP bolts and SpeedPros and wrap it to 6800 every Saturday night! Machine work at Cutshalls, assembly by yours truly!

Dirt Forum Champ
Total posts: 635
posted April 11, 2005 08:22 PM  
I'd use at least Pioneer Performance or the ARP 8740 rod bolts. It'll cost you more short term, but the rods will be good for a couple years at those RPM. I have a set of GM 5.7 rods prepped with ARP 8740 'wave loc' bolts going on their 4th season. I checked them before putting them in this year and 5 of the 8 were still within .0001" of being perfectly round. The other 3 were only off by .0003" and just needed a touch on the rod hone.

Speedpro hypers would probably be ok. Although, the 'good' Speed Pro's are about $200 and the KBs are about the same. The KBs are a T6 heat treat versus the T5 treating on the Speed Pro's. That makes them about 20-25% stronger and more wear resistant.

He's probably charing $80 for the rod bolts, $100 to resize the rods and the rest for the KBs.

Dirt Maniac

Total posts: 103
posted April 12, 2005 05:24 PM  
Thanks for the reply. I have assembled my own motors before, but they were 350's. I wanted to be sure this motor was done right being a 406, plus I wanted my cam dialed in inwhich I have never done before. You are right on the reputaion deal, he is very conscience of his rep. He IS the best in our part of the country.

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