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Yella terra head

Hey y'all.

It might sound like a stupid question, but can anyone tell me the advantages of a yella terra head over the standard holden head? I'm running a standard 179 in a EH sedan and have often wondered if I could get a bit more power/torque if I changed to the YT head. Also are all YT heads exchangeable on the holden sixes? eg. 202,186,179,173,161.

Cheers, Ben.

Model: 

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The advantages are better power / torque and fuel economy. The YT head should fit no probs on the red 6 as per your post. You may find like I did that the 202 version will be a non adjustable rocker type also with this you will need the 202 push rods.
They are becoming harder and harder to find.

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oo

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Cheapest Mod of all is put a standard 149 head on yr 179.Same valve sizes and it raises the compression ratio to about 10 to 1.
Before you do anything get a compression test or do it yourself .If you dont have 175psi in all pots (give or take 10 psi) you're flogging a dead horse and a hone and new rings are in order.Compression is a major source of power at all RPM.
You dont need to spend big bucks to make a 179 EH go hard.You don't find many cars with a 3 litre engine that weigh 1100kg.Thats less than a Honda Jazz or Corolla.
Twin strombergs,extractors, a mild cam with your 149 head, pistons ,rings and bore in good condition and you'll smoke the back wheels !!

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ive got a old motor magazine with an add for yella terra and they recon 30 percent in power and torque over standard with no other mods
[http://gallery.oldho...|Shed]

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