302 SBC - How to torque ARP Rod Bolts - Strech/Strain Explained

Рет қаралды 1,970

Ай бұрын

In this video I explain how to torque a connecting rod bolt, and how to check the stretch of the bolt, and why that is important.
The engine in this video is Tony Guzzo’s 302 Chevrolet for his 1968 Camaro Z/28.
#summitracing #z28 #chevrolet #chevy#sbc

Пікірлер: 37

@robertwest3093 Ай бұрын

It’s the things like this that make your channel so wonderful. Torquing bolts seems like an afterthought but if you don’t have everything prepped correctly and aren’t using the correct lubricant to torque with then those lb/ft torque wrench numbers go out the window. Using a stretch gauge makes it basically foolproof. Thanks AG!

@goldsgarage8236 Ай бұрын

Thanks for the nice comments Robert. Keeps me motivated. AG

@gregleenyit Ай бұрын

Another excellent video Alan Thank you

@goldsgarage8236 Ай бұрын

Thanks Greg. AG

@blueblood76 Ай бұрын

Also I like to burnish the bolts like 5 times to 75% of overall torque before final pull down and check with stretch only.

@goldsgarage8236 Ай бұрын

That is a good idea. Polishing the threads reduces friction and creates more stretch. AG

@stephenhowe4683 Ай бұрын

Yes! The stretch vs torque changes first few cycles, then settles.

@mattmichniewicz1654 Ай бұрын

Thanks for another awesome video !!! Can you please add a video on SBC Timing Chains, timing chain slop, etc. to your roster

@goldsgarage8236 Ай бұрын

Thanks Matt, sure we will get to that eventually. chains seldom break, but they can mess up your timing. AG

@jimclarke1108 Ай бұрын

Perfect

@goldsgarage8236 Ай бұрын

Thanks Jim. AG

@blueblood76 Ай бұрын

The full stretch # is what they want you to shoot for. You can stretch them little bit more. ARP has a percentage of overall stretch you can go. ( and not freak out and toss bolt.) They set up stretch at like say 75%. They have a range of like 70% to 80% so they give you the middle #. You can go higher from ARP tech.

@goldsgarage8236 Ай бұрын

Thanks for the info. AG

@JW-hm6ou Ай бұрын

Thanks for making this video. Looking forward to your video you made at the college to be released. What does ARP recommend for their 2,000 fastener?

@goldsgarage8236 Ай бұрын

Thanks JW, it is in the pipeline so coming soon. AG

@larryburns4605 Ай бұрын

Talked to Scat years ago they did A lot of research and testing to get torque on fasteners in there product s.

@goldsgarage8236 Ай бұрын

Thanks for the info Larry, they have a good product as far as i know. AG

@UncleVom Ай бұрын

As usual good 'splainin'. Thanks. Are those rod bolt reusable or is that it for them? The production automotive world seems full of "torque to yield" fasteners these days from suspensions to engines.

@goldsgarage8236 Ай бұрын

These bolts are definitely reusable. I cover this detail in my Forsyth presentation. AG

@UncleVom Ай бұрын

@@goldsgarage8236 I'll have to check it out, I remember starting to watch it and being dragged away for something.

@bigal878 Ай бұрын

Good video 👍🇦🇺 Is there any reason you didn’t select one of SCAT’s conrods that has a 7/16” rod bolt (instead of 3/8”) noting that this 302 is going to want to go to 7000rpm with the cams you are looking at? Thanks.

@goldsgarage8236 Ай бұрын

Thanks for the question Al. The original rods had 11/32 rod bolts torqued to 35 ft.lb. The so called pink rods were the same as any other SBC rods except they were shot peened to reduce stress concentration. The SCAT rod will be more than enough. AG

@bigal878 Ай бұрын

@@goldsgarage8236 sounds like a fair reason. I’ll be following the build 👍🇦🇺

@KenheinrichHeinrich-fr9vw Ай бұрын

Hello, my name is Ken and I really enjoy your show. I am building a small block Chevy with a roller cam. I will be using either a timing chain with a Torrington bearing or a thrust washer. What advise would you give for trying to direct additional oil to the thrust washer or bearing? And which do you prefer, a thrust washer or a Torrington bearing? I am considering drilling a small .040 hole between the cam liner bore and the cam liner itself through to the oil feed hole coming up from the crank. Thank you for your help.

@goldsgarage8236 Ай бұрын

Thanks for the question Ken. Thrust forces with a roller are minimal and the factory oiling system provides plenty of lubrication. I have used the Torrington bearing successfully without any oiling modifications. AG

@billlittle4285 Ай бұрын

I drill a .020 hole in each lifter gallery plug like Gm did on late model blocks to bleed air from the gallery, you will get lots of oil from that.