Probably not a fab question

[Etgan_06]

Hey guys this isn’t a fab question but I couldn’t find the precise place to put this. 
how much money and time would it take to get an engine converted with hemi heads and pistons/is it even possible. I’m looking at doing this for an RB26 build I’m putting together

also if anyone knows of somewhere in SA that does this could you leave a link or a name for the place.

thanks I’m advance

[GTSBoy]

What do you mean "converted with hemi heads"?

Let's make a few points.

• I'll presume you do not mean "hemi" as in "Hemi"....ie Chrysler heads. That's what a lot of people would mean when they say "hemi heads".
• I know and totally understand that the concept of hemi heads is much wider than that. Example such as ALFA twin cams going back to the 50s spring to mind, amongst hundreds of others.
• Are you aware that there's not really any such thing as a 4 valve hemi combustion chamber? Have you ever seen one? There isn't room to fit 4 valves in. That is is why 4 valve heads are all pentroof design (or some variation thereof).
• 4 valves provide more valve/port area than 2 valve heads do, which is why they exist.
• Going backwards from 4 valve pentroof, to hemi 2 valve seems.....backwards.

[TurboTapin]

9 hours ago, GTSBoy said:

What do you mean "converted with hemi heads"?

Let's make a few points.

• I'll presume you do not mean "hemi" as in "Hemi"....ie Chrysler heads. That's what a lot of people would mean when they say "hemi heads".
• I know and totally understand that the concept of hemi heads is much wider than that. Example such as ALFA twin cams going back to the 50s spring to mind, amongst hundreds of others.
• Are you aware that there's not really any such thing as a 4 valve hemi combustion chamber? Have you ever seen one? There isn't room to fit 4 valves in. That is is why 4 valve heads are all pentroof design (or some variation thereof).
• 4 valves provide more valve/port area than 2 valve heads do, which is why they exist.
• Going backwards from 4 valve pentroof, to hemi 2 valve seems.....backwards.

Please oh please be Chrysler Hemi heads. 

[PLYNX]

Or maybe he's referring to the "semi" hemispherical aluminium heads Ford was experimenting with in the 60's on the 427/428 engines ? 

Gotta go with TurboTapan here as well !