XD_ESP XELR8!

US2v.100 .200 .300 .400 .500 .600<STOCK
2.03 I 68 142 189 199 196 198
1.67 E 57 89 120 143 159 162
US2v.100 .200 .300 .400 .500 .600 <4v Valves Stage 3 (OLD SCHOOL)
2.19 I 70 139 197 216 216 218
1.71 E 54 102 142 166 178 181
AU2v .100 .200 .300 .400 .500 .600 <STOCK
2.19 I 62 119 165 189 198 NA
1.71 E 47 84 114 138 162 NA
AU2v .100 .200 .300 .400 .500 .600<CC ported
2.19 I 84 163 218 232 252 NA
1.71 E 79 116 165 190 212 NA
WHAT DO YOU THINK???

xbgs351

Only significant difference is the combustion chamber volume. Use the 302C heads when you need extra compression.

XD_ESP XELR8!

I was told that the US heads have a better Exhaust than the aussie one,s? coolent was one of the big things so i,m told, but it does make sence Us heads used coolent as aussie ones didnt untill XD??? any Imformation would be great? What do you think Cheers. XELR8

xbgs351

All heads have coolant passages.

XD_ESP XELR8!

1970 to 1974 they used coolent <us heads In AUST they didnt use Coolent Till the XD (20 or 30 years of water will make a hell of a difference?)(they did the clevo for 5 years we did the clevo for 10+years? but didnt use coolent till the XD as they used coolent with all off there clevo,s??? Cheers XELR8

xbgs351

Water is a coolant. XBs used a rust inhibitor, so I don't know what you are on about.

XD_ESP XELR8!

Have you ever heard of (water corrision) thats why they use Coolent! Isnt no were near as bad as plane water? thats the only way I can put it cheers XELR8

xdclevo

There is really no such thing as coolant i beleive. There is "rust inhibitor" and "anti freeze" for low temp areas/countries. The rest is up to you to maintain a good running temp with effecient radiator, water flow and airflow.

mach1mike

Use Aussie 302c's, best bang for buck (or in my case £) money can buy

Stop sodding around & feel the difference.

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xbgs351

No that is why they use rust inhibitors.