possible head swaps to L28ET

[Guest mutlitrackdriftu]

this is my first post here, but i have gotten information from here for almost 2 years. hybridz has proven to be very helpful in the past, and i hope that i can get my first question here answered as quickly as everyone else has.

 

anyways, i just got my hands on an L28ET F54 block, and i was wondering what kind of head swaps i could possibly do to it.

 

now i remember hearing somewhere that RB26 heads bolt straight onto L series motors, but i wanted your guys' verification so i could be certain. pretty much what i'm looking for is a head that can breathe well enough to make the bottom end produce power all the way up to the 9k+ range, and i think an RB26 head would be more than suited for that, so the idea of converting an L28 stroker to dohc and slapping on a RB26 head sounds really appealing to me.

 

if you guys have any other suggestions, i want to hear those as well.

[CamH]

Hey, there are no easy solutions for a DOHC head, RB series heads do not mount on to L-series engines. There have been some DOHC heads built, such as the extremely rare and extremely expensive OS Giken head, and member here 1 fast z built his own DOHC head out of a few KA24DE heads. The best solution as far as I know for the L series engines is the P90 head which your L28ET should have on it already.

[ArnZ]

Who told you that? I would pretend that question wasn't asked.

[Guest mutlitrackdriftu]

i knew it sounded far too good to be true, but i just wanted to make sure.

[Mack]

you can BOLT an RB26DETT head onto an L28 block. the bolt spacing and bore spacing line up just fine. its the water and oil passages that are a PITA. also, the timing belt VS timing chaing becomes a problem.

 

but yeah, the KA head was one of the more viable options I could come up with. Good to see 1 fast Z got his up and running, as mine has been in the machine shop untouched since march. bastards.

 

You can bolt a KA head onto an L series 4 cylinder block. simple evolution really. the RB series is actually an evolution and hybrid of the l series. it shares a lot in common with the L series motors, yet it also has things in common with some of the other nissan and heavily prince influenced engines such as the S20 and FJ20.

[ArnZ]

If it were feasible, there would be pictures galore! See "My official L31DETT RHD thread" http://forums.hybridz.org/showthread.php?t=120659 for starters.

[Mack]

Ugh, I have an RB25DET head and multiple L series blocks, Ive seen and done. I know it can be done. also, somewhere in 1 fast Zs shop lies my RB25DET headgasket. and somewhere in his pics or maybe my pics, I have a shot of an RB headgasket next to an L series.

 

I know what 1 fast Z has done as he and I worked on that head together until I moved away from phoenix 2 years ago. The KA head route was chosen because the coolant and oil passages needed VERY little modifying, the heads are PLENTIFUL and they flow REALLY well stock. I suppose one could use an RB head with all -an fittings for the oil and water, but getting an RB head is almost as difficult and costly as getting an entire RB engine.

 

actually, there was a rumor about a guy in japan that had an L24 with an RB20 head and converted it over to belt drive. It was only mentioned a few times in various forums Im on, but was never accompanied by a link or photos.