[surfshark]

I'm finishing the pre-fitting of my 383 today and I just want to run something by anyone who has a minute: I get a different torque spec from everyone I talk to on tech lines especially due to different types of lube.

I have ARP main bolts (#134-5202) and ARP rod bolts/nuts(not the wave-locks) and the torque specs I got from the ARP tech rep is: 70lbs inner and outer for the mains using ARP assembly lube and 50lbs for the rod bolts using ARP assembly lube.

This differs from what I see on the back of the ARP packaging, but I have been torquing them to the specs I got from ARP via phone.

Is there any margin to play with here and does this sound right to you? The phone advice for torque seems to exceed what I read elsewhere.
Just double-checking and thanks for any advice.

[CNC BLOCKS NE]

We use a lot of the main bolt kits form ARP and we have used ther lube and torqued them then to 65 both outside and inner bolts and we torque them in steps and if your read the instructions the block should have been line honed and who ever did the line hone should give you the specs as what they torqued the main bolts too and the sequance.

When we line hone a block for another shop or engine assembler we gine them a sheet with the torque specs and sequance so every thing is dupicated.

As we have seen a differance if torquing the out side first then doing the inside first.
Carl

[surfshark]

Thanks, I'll check with the machine shop. I called them and I think they forgot ot call me so I went ahead and called ARP. I know the machine shop (they align bored it) uses oil for lube instead of ARP assembly lube. I think I'm beginning to be a pest to them. I'll just call 'em on Monday anyway. I've already checked my clearances with the ARP recommendations too.

[CNC BLOCKS NE]

Originally Posted by surfshark

Thanks, I'll check with the machine shop. I called them and I think they forgot ot call me so I went ahead and called ARP. I know the machine shop (they align bored it) uses oil for lube instead of ARP assembly lube. I think I'm beginning to be a pest to them. I'll just call 'em on Monday anyway. I've already checked my clearances with the ARP recommendations too.

Most line boring machines can't bore all the mains at once and some times require 3 set ups to do the job.

We always finish with a line hone as it seems to be the best way to finsh the main line and the finish is much better for heat transfer compared to a line bored finish.