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Rb25/30det

Morgz32

By Morgz32,
in Engines & Forced Induction

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Morgz32

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ey fellas

im abit confused, have read a few other threads but thought i might ask the question myself..

I understand that by putting on a RB25DET head onto a RB30 block the heads oil VCT hole has to be welded up and a external one has to be made due to the RB30 not having this hole in the block.. im just confused on the water gallery jacket and what head gasket i should use?? correct me if im wrong but my understanding is you have to weld up the heads water jacket to suit the RB30 block or vice-versa?? and do i use a RB30 Or RB25 headgasket??

And one other thing how can you tell the difference between a series 1 and series 2 RB30 block? it says in the build thread i need a short motor with the turbs oil/ water feedr and return lines and has both tensioner locations machined flat.. i assume i use the RB30 from a vl??

cheers

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Morgz32

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most if not all s2 blocks have the oil and water feeds and the tensioned machined. early vl's have s1 blocks and some later ones have s2 blocks. all 31s have s2 blocks

so really i should get a block from an R31?

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Morgz32

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To save a bit of work, yes.

Today found a 30 bottom end from a 87 calais (apparantly 87 onwards are series 2 motors?) and of course had the oil/water feeder galleries and oil turbo return

and from what i could see from behind the timing cover was a thread tapped out which would be used for the idler pulley for the conversion.. It looks like its in the same place as the idler pulley which is shown in the build thread

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