Rb26 Cams

[gtr jason]

Hi guys anyone know the biggest lift cam you can put in an rb26 with out doing mods to the head besides valve springs the cams that came out have 9.75mm lift and i want to go up to 10.25mm thanks jason

[ylwgtr2]

cant do...you have to releive the head

[Mik]

cant do...you have to releive the head

<{POST_SNAPBACK}>

Depending on brand, you can run 10.25mm without relieving the head, but there is no way I'd do that on stock springs.

[ylwgtr2]

Depending on brand, you can run 10.25mm without relieving the head, but there is no way I'd do that on stock springs.

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hows that done?Diffrent base circle and big shims?

[Mik]

hows that done?Diffrent base circle and big shims?

<{POST_SNAPBACK}>

Yep...even the 9.7mm won't fit without releiving the head (on some engines at least). Jun are the only 9.7mm lift cams I know of and they run a 31mm base circle, which makes things a pain if you want to change cams, because you will need to reshim every bucket. (unless you find some other cams with 31mm base circle.

[ylwgtr2]

id say its better to relieve the head....i knew of the base circle thing but myself id just be going the other way