2.4L heads on a 2.5L

[wanagofass]

Just wondering if there are any other differences, if you were to machine 2.4L heads for dowel pins would they work on a 2.5L?

[fyremanbil]

Or you can remove the dowl pins and they are a direct bolt on.

[200VEGAS]

what abvout 2.5 heads on a 2.4

[Way2slow on H2O]

Just wondering if there are any other differences, if you were to machine 2.4L heads for dowel pins would they work on a 2.5L?The 2.4 head doesn't have the "boss" for the dowel (can be welded and machined but probably cheaper to buy 2.5 heads, lol) as mentioned, will work w/out dowels

[wanagofass]

Thanks guys, I've got a 2.5 fat block that i'll be putting on my viper that id like to wake up a little and happen to have a set of cut one piece 2.4 heads

[Dave S]

Get some 2.0 pin heads..... they have smaller chambers and bolt on. .2.4 heads are not worth it.

[wanagofass]

Get some 2.0 pin heads..... they have smaller chambers and bolt on. .2.4 heads are not worth it.
The 2.4 heads I have are around 30cc, that'll be my next question, how small of chamber I can get away with on pump gas.

[kingsbiship]

30cc mite be pushing it a little (for pump gas) 34 is usually the magic number! 2.4 heads can be used!

[T-REX]

Mota hed hit tha nail on tha hed.....34cc's iz az small az ya wanna go, and yo mota won't know tha differnce...2.4 or 2.5 hed, they both do tha same thang......I run a set ov heds with NO dowl pins, that have 10cc chambers....HAVE NO PROBLEMZ!!!!....JMO

[Dave Strong]

10cc ??

Dave

[T-REX]

I got sum 8cc too!!....:-)

[fyremanbil]

And I thought only GM made 2 stroke diesels:D

[rhickox]

Hey Rex,,, U want a set of 14CC Hi Po 2.5 heads?? Or anyone else?? They haven't been O-ringed, jus had to cut em that much to get em straight..

[T-REX]

I run a set ov 14cc heds(no Orings) on my lil outlaw bote fer a lil while(wuz a had-to situation)...and they wuz only good for 6 to 8 passes before they blew tha hed gaskets.....Back when I started doin tha Hi compression thang, Galen Burden builkt me a set ov Oring heds wit 8cc's, az well az tha 10's....They were 2.5 heds, oringed for a 2liter....Galem said thier wuzn't enuff meet left after oring'in a 2.5 hed for a 2.5(with big compression)....I personally thank anythang less than 21cc's needs to be oring'd!!...JMO

[mrcrsr]

is there any gains to be had w/ the different combustion chamber shape on the 2.4 head? i wouldn't think so otherwise merc would've carried the design over to the 2.5, but merc has been known to walk backwards!

[T-REX]

If they iz, It ain't enuff to see(at leest I never seen it!!)....When I first started mess'in wit theze OB's, and run into tha Hemi heds, I figger'd it hadda be a better hed bekause bein a Mopar man, and tha HEMI bein THE ultimate HP mota, hadda be tha hed design that helped.....Well, Tha 4 stroke HEMI hed wuz ther for differnt reasons than tha 2 stroke version...Tha Chrysler hemi hadda have hemi heds to make room for them humungus valves, but tha 2 stroke don't be got no valves, so I alwayz wunder'd if tha shape ov tha combustion chamber had any other advantages...Well, If so, I never seen it!!!...I run both kind with plenty compression, and they both gave the same results.....But, I like tha HEMI heds, bot only kuz they have that HEMI name...:-)...