mwilkinson Posted December 8, 2010 Share Posted December 8, 2010 I am in the process of doing an engine refresh. The engine is being completely removed and rebuilt but will remain predominantly stock. I have no major power ambitions other than possibly one day to run a max of 600 bhp, but no time soon. I will be fitting new oil pump, water pump etc.. I will also be installing a set of 264 cams, larger injectors and a set of CR reburb turbos. Thus a BPU+ modified state. While I am rebuilding the block I was going to replace the head bolts with ARP ones and I had also thought to replace the con rod bolts for ARP ones too. I have read a few threads and one suggested that the con rod bolts would only need to be uprated if the engine were to run higher than stock rpm. I have no intention of doing this at this stage so would this be worth while or overkill? Alternatively is this a good bit of future proofing? Any input would be gratefully received. Quote Link to comment Share on other sites More sharing options...
JamieP Posted December 8, 2010 Share Posted December 8, 2010 Wont hurt. Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted December 8, 2010 Author Share Posted December 8, 2010 That was my initial thinking, but then there is still a part of me saying overkill? Is it replacing a part for the sake of it. If I'm doing this then should I not be replacing the rods and pistons with uprated ones? Where do I draw the line? Quote Link to comment Share on other sites More sharing options...
JamieP Posted December 8, 2010 Share Posted December 8, 2010 You have to use new head/rod bolts anyhow with the rebuild so may aswell fit arp ones is my thinking. Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted December 8, 2010 Author Share Posted December 8, 2010 Well when you put it like that its a no brainer really. Quote Link to comment Share on other sites More sharing options...
Morpheus Posted December 8, 2010 Share Posted December 8, 2010 (edited) I agree with Jamie; ARP are the best unless you go with Oliver rods and the 7/16" bolts that they come with. ARP L19 or 2000 rod bolts are very high end but for all we know, the stock ones are as good or better. They're obviously capable of staying put at 7k+ rpm. Examine your rod bearings carefully and if there's no sign of stretching (uneven wear on the rod cap bearings) then keep them stock. Some would say that you must replace the bolts with every tear down, as they'll stretch over time but if it was me, I'd buy new Carillo or similar 'H Beam' rods while I have the chance and use the included ARP's and their grease and torquing instructions. As for head bolts, get some ARP head studs instead. Studs are always better than bolts if you can use them, as the top threads are finer and you'll get much more accurate torque readings and consistency across the head. Also, studs don't wear the block threads and don't risk stripping them. You'll need to grease and install some of the hardened stud nut washers before fitting the head though, as they won't go on with the head in place. Fwiw, have a look at these....... PO5vt3QMX1w _MsqA-C3vGI 13gGQC5fha8 VGup8ABckrw Edited December 8, 2010 by Morpheus added related videos (see edit history) Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 8, 2010 Share Posted December 8, 2010 It totally depends on what your goals are. If you are running stockish power, then stock bolts will be fine. Remember unopened engines cope with 600 bhp for years. Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted December 8, 2010 Author Share Posted December 8, 2010 Will defo go for the ARP studs. Thanks for the input guys. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 9, 2010 Share Posted December 9, 2010 *JZ-GTE head bolts are reusable. I would change the rod bolts, for sure, but use stock head bolts and main cap bolts unless you are building something with potentially huge power. Quote Link to comment Share on other sites More sharing options...
SimonB Posted December 9, 2010 Share Posted December 9, 2010 There is a spec in the engine manual for head bolts - you measure their diameter and if within spec they haven't stretched too far and you can re-use them. Having said that if going to the trouble of rebuilding I'd probably change them anyway. The ARP studs are cheaper than the stock ones, so if you are going to change them you may as well use them. Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted December 9, 2010 Author Share Posted December 9, 2010 Chris/Simon, Thanks for the input. I agree with what Simon has said so will replace the head bolts for ARP. Will also replace the rod bolts while I am at it, but assuming still in spec will reuse the main cap bolts. Quote Link to comment Share on other sites More sharing options...
Wez Posted December 9, 2010 Share Posted December 9, 2010 Uprated rod bolts and 8000rpm rev limit Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted December 9, 2010 Author Share Posted December 9, 2010 Morpheus, Just finished watching those videos. Other than the use of the word "trick" it was quite enjoyable. Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted December 9, 2010 Author Share Posted December 9, 2010 Your a dangerous man Wez Quote Link to comment Share on other sites More sharing options...
hodge Posted December 9, 2010 Share Posted December 9, 2010 Uprated rod bolts and 8000rpm rev limit I had a thread about this a few weeks back. Won't the rods let go at a higher RPM Quote Link to comment Share on other sites More sharing options...
Morpheus Posted December 9, 2010 Share Posted December 9, 2010 Morpheus, Just finished watching those videos. Other than the use of the word "trick" it was quite enjoyable. I'm glad you found it as bitchin' as I did. Quote Link to comment Share on other sites More sharing options...
Wez Posted December 9, 2010 Share Posted December 9, 2010 Your a dangerous man Wez I had a thread about this a few weeks back. Won't the rods let go at a higher RPM Who knows Quote Link to comment Share on other sites More sharing options...
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