den001 Posted January 16, 2008 Share Posted January 16, 2008 im just curious to know if i can drop a set of hks 272 duration with 10.2 mm lift into a standard head casting???? im not entirely sure if there is a set that requires machining for clearence but thought id ask the question.... ive heard that some high lift cams require relifes to be machined out of the head for the increased lobe size... does anybody know whats the max on a standard rb26 head casting??? thanks denis Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/ Share on other sites More sharing options...
Duncan Posted January 16, 2008 Share Posted January 16, 2008 no, you will need to relieve the head for sure. Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3585762 Share on other sites More sharing options...
Risking Posted January 16, 2008 Share Posted January 16, 2008 (edited) depends on the base circle of the lobe. If its a 31mm lobe then no they wont fit without machining out the head, If they are 30mm base circles then chances are they will clear the head but require new shims or bucket/shims to accomodate. Honestly get them anyways and machine out the head, its so worth the extra effort. Edited January 17, 2008 by Risking Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3585772 Share on other sites More sharing options...
den001 Posted January 16, 2008 Author Share Posted January 16, 2008 no problems, thanks both of you for the good info... i will get them anyways, just heard that there may be clearence issues so i thought id ask.. cheers Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3585820 Share on other sites More sharing options...
rockabilly Posted January 16, 2008 Share Posted January 16, 2008 if it helps i have jun 264/in and 272/ex 9.7mm lift. these are the biggest cams for lift in a std rb26 head. bernie Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3586381 Share on other sites More sharing options...
2BNVS Posted January 16, 2008 Share Posted January 16, 2008 im the same as rockabily Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3586459 Share on other sites More sharing options...
rev210 Posted January 17, 2008 Share Posted January 17, 2008 You need to re-shim with the Juns, different base circle. Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3587423 Share on other sites More sharing options...
Swiper the Fox Posted January 17, 2008 Share Posted January 17, 2008 You need to re-shim with the Juns, different base circle. not 9.7's as they have a 31mm base circle...same as stock Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3587431 Share on other sites More sharing options...
2BNVS Posted January 17, 2008 Share Posted January 17, 2008 yep didnt reshim mine Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3587572 Share on other sites More sharing options...
special_agent Posted January 19, 2008 Share Posted January 19, 2008 i have just installed JUN 266 9.7mm inlet and exhaust, the base circle is smaller on these cams and needs to be re shimmed, they clear without machining. Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3590856 Share on other sites More sharing options...
den001 Posted January 20, 2008 Author Share Posted January 20, 2008 ok, took the cams and valvesprings to my engine builder and he has to relive teh head and reshim it... this is for 272, 10.2mm lift in and out. thanks for the help guys Link to comment https://www.sau.com.au/forums/topic/201833-rb26-head-and-cam-question/#findComment-3592144 Share on other sites More sharing options...
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