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i have looked at a few motors especially ones in gts-t's from R32 to R33, the biggest difference i seen is the cam cover, RB20 has RB20 imprinted on it and you wouldnt miss it because it is on the front top.....on the RB25 like mine doesn't have anything printed on it....as far as i know RB20's and RB26's have the imprint....hope this helps mate

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The dead giveaway is that R32 engines have #5 & 6 plenum & inlet manifold runners offset towards the centre of the car whereas #1 thru 4 runners are a little bit outboard.

That applies to RB20DE, RB20DET & RB25DE as far as I know.

Edited by sonoramicommando
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not all rb20's have RB20 stamped on the cam cover, from what i understood it was only the 89-90 model ones.

as RB SANDY has said the 25 has a raised section towards the end of the rocker cover and the 20 doesn't. also most of the 25's have a raised bump on the front came cover for the VVT. and the intake plenums are noticably different from each other. the way the oil breather line fittings are facing is also different between the two, as is the stock BOV setup, RB20's are vertical and RB25's are horizontal.

best thing to do would be to look at as many pics as you can of the two and see if you can find all the differances.

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VCT section is raised is the dead give away along with the cam covers

and also the mod plate......if it says rb25det....if it doesnt and it has one then dont buy it until they get you a mod plate...illegal otherwise.

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ah ok thanks. heaps of info, awesome. the numbers that a rb25det will put out are just so much bigger than an ej25t, so ive come to the other side. cant see this handling like the liberty did though.

also... i meant rb20 in the end of the first post but i think you guys all picked up on that.

Edited by grem
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i know a few people who have got their RB20 and RB25 ceffy's handling pretty damn good....ohh and i think this is already mentioned but i would say that check the mod plate mate......that should give you some details

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