Rb20/30?

[Axeman83]

hey guys, has anyone done this? ie RB20 head on a 30 bottom end? im aware the the smaller ports and valves wont make as much power per psi as a 25/26 head, i assume the chamber diam might also be wrong but im sure it could be ported out a touch to suit. i would think this combo would make awsome low down torque, especialy if it was fitted with twin t28s etc

is there a reason it wouldnt work that im not seeing?

cheers in advance

[zebra]

Doesnt fit from memory.

R32 RB25DE head would be the one you want

[Axeman83]

i have access to a 25 head yes, i was just curious about the 20head combo

[Axeman83]

just went a laid a 30 headgasket over the 20 head and it all lines up, headbolts are the same, the chambers are about 3mm out but that would port out very easy, the water galleries are out but could be lined up too. are the cams the same length? would the belts line up?

[zebra]

Thats a lot of effort for 0 gain...might as well just leave the 2 valve head on imho.

[NSNPWR]

Has been done, there was a blue over silver VL Calais years ago, one of the first 3 litre twin cam conversions, JET 88C I think it was...guy thought it was a 25 head from memory but later found out it was a 20 head when it didnt make as much power as they expected on a given boost level.

Single cam head FTW if its in a VL Guys have made over 500rwkw with the single cam.

Edited May 2, 2011 by NSNPWR

[R31Nismoid]

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