looking for a little advice here. dropped my motor off at the machine shop last week and machinist recommended i just run the stock 351w rods w/ some arp bolts. he said it would cost me $180 with him cleaning them up and the new bolts. i was planning on buying some scat h-beams but not sure if i could get by with using the stock rods or not. didnt know if he is just telling me this so he can make an extra $180 or if my old c90e rods would hold up. motor will see 650-700hp on the bottle. thanks for any help

 

Rods are the weak like on a 351w. You say you wanna make 650hp but what do you plan on spinning the motor to? If you can do it below 7-7200, I'd run the 69 rods. Thats what will be in my 351.

 

its not going to be spun above 7k. just trying to put something together that can handle a lil spray.

 

There's one in machine shop now...should be running in the next couple weeks with this set-up. Come check it out

 

go with the better rods.
fordstrokers.com

 

Pay now or pay later. If you plan to spin over 6k I would invest in the rods and a crank. You can still make good power below 6,.. but at the power level your aiming for and even at say 6500 rpm,.. thats a good bit of stress. I think it would hold for a long while. But eventually you would see a failure. Its like pushing a mod motor to 450hp. Sure it might stay together for almost a year,.. but how much damage is it going to cost you when it goes?

Hurst

 

In theory all ^^^ sounds good, but what is a stock block good for? Why build the bottom end to support 1000hp when the block wont live that far?

 

i think ill try my luck with the stock rods

 

you are a smart guy....

 

The early blocks are good for 800hp,.. 600 - 650 with stock rods and crank. With good machining and balance the early blocks can even go as high as 1000hp. But he's wanting to spin over 6000 rpm. At the 400 - 500hp levels they might take 6500 rpm on a regular basis,.. but 800hp is a considerable difference on a stock rotating assembly.

Why chance it?

Thats like a mod guy buying a fully forged rotating assembly,.. puts it all together and never spent the first dime on machine work or any balancing. Then cries that his rotating assembly is junk when it blows up. If your going to make that kind of power,.. you need to have the supporting mods to back it up or your going to break shit.



Hurst