2.8 build which head ????

[JAFF]

hi all , in the process of getting all the bits for my2.8 build ,just wanting to know what the best combination of head to use an 855 /731 and what cam's can be used to uprate them ,and on that note im still after the con rods

[JAFF]

any one ?????/

[toby]

885 head
You've seen this? - http://www.e30zone.net/e30zonewiki/inde ... ding_a_2.8

Cam is your choice but around 272/272 is frequently claimed by a few to be the best all round choice. Others like goosiegander have used slightly higher lift ones.

[daimlerman]

Head choice should be ruled by piston selection.

All 2.8's built to date seem to have used 325i pistons/885 head.

[rossmc88]

looks like you'll just have to buy my lovely refurb'd 855 head

[reggid]

i would go 885 unless you spend alot of coin to get the 731 to flow like the 885 which requires oversize valves for the 731 as a minimum. A 731 head with the same flow as a 885 usually would have smaller ports for the same flow which keeps the port velocity higher.

[JAFF]

thanks all i know which route im going to take then

[Simon13]

i've still got the m50 rods here, exactly the same size as M20 ones, if a touch lighter

[JAFF]

Simon13 youve got P.M