al02uk Posted February 22, 2012 Share Posted February 22, 2012 Hi all, Apologies if this has been asked before but I can't seem to find anything using search. I'm looking at getting some ARP headstuds for my NA-T conversion, but it appears that there are two types for the supra. One code is: ARP 203-4205 and the other is: ARP 203-4702 (Undercut??) I'm unsure what undercut means, which would you recommend? Thanks Andy Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 22, 2012 Share Posted February 22, 2012 I'd recommend you save your money for the forthcoming EU meltdown, and use the stock head bolts Link to comment Share on other sites More sharing options...
martin p Posted February 22, 2012 Share Posted February 22, 2012 slightly off topic But are stock head bolts re-usable? Link to comment Share on other sites More sharing options...
Guest j2x Posted March 7, 2012 Share Posted March 7, 2012 no, they are torque to yield type which means they stretch and are not reusable. Link to comment Share on other sites More sharing options...
Digsy Posted March 7, 2012 Share Posted March 7, 2012 (edited) no, they are torque to yield type which means they stretch and are not reusable. That's not strictly true. Some torque to yeild type head bolts can be re used, depending on how far past the yeild point the tightening procedure takes them. Not sure about the Supra specifically, but some service manuals specify a maximum elongation after which they cannot be re-used. I'm sure the Supra service manual will say for certain if they can be re used or not. FWIW if the rebuild is after a significant power increase, I would use new ones to be on the safe side. Edited March 7, 2012 by Digsy (see edit history) Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted March 7, 2012 Share Posted March 7, 2012 Toyota manual gives specs for re-using the stock bolts. Personally I would buy new one's or for an extra 20quid buy ARP's, not that your really going to need them on an NA Link to comment Share on other sites More sharing options...
al02uk Posted March 9, 2012 Author Share Posted March 9, 2012 I ended up buying the ARP's to be safe Link to comment Share on other sites More sharing options...
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