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1990BNR32 · 21st June 2008, 05:59 AM

the dummy head i used for my overbore to 87mm was shipped out to me from XS engineering. it is about 2" thick and it is *HEAVY* so I'm pretty sure it's not aluminum.

the explanation i was giving is that you just need something on top of the block and torqued down to the same spec you torque the head to at each head bolt/stud hole because the bores will distort with/without something bolted on.

***

kismet, a question for you... i was under the impression that the Cosworth bearings only come in two sizes, standard and race. from your original post it seems like you were able to get 2 different sizes of main bearings from Eric at XS. did you get 3 standard and 3 race bearings or did you actually get them to send you over or under sized bearings?

21st June 2008, 05:59 AM	#32 (permalink)
1990BNR32 GTROC Member Join Date: May 2003 Posts: 213	the dummy head i used for my overbore to 87mm was shipped out to me from XS engineering. it is about 2" thick and it is HEAVY so I'm pretty sure it's not aluminum. the explanation i was giving is that you just need something on top of the block and torqued down to the same spec you torque the head to at each head bolt/stud hole because the bores will distort with/without something bolted on. *** kismet, a question for you... i was under the impression that the Cosworth bearings only come in two sizes, standard and race. from your original post it seems like you were able to get 2 different sizes of main bearings from Eric at XS. did you get 3 standard and 3 race bearings or did you actually get them to send you over or under sized bearings? __________________ 1990 Grey R32 GT-R - Sold! 1997 White R33 GT-R Vspec - Sold! 2000 Black R34 GT-R Vspec