louix Posted October 31, 2009 Report Posted October 31, 2009 thinking of buying a car with an engine conversion with a 4age in it just want to know how you can tell if its a bigport or a smallport 4age as the owner doesnt know either? Quote
Trev Posted October 31, 2009 Report Posted October 31, 2009 If you can see the top of the sparkplug leads then its a bigport, Unless it is a smallport without the top cover, A bigport will have a smooth intake manifold with tvis, A smallport will have a ribbed intake. Quote
kiahn Posted November 3, 2009 Report Posted November 3, 2009 easiest way to tell is the bigport has 8 runners and the smallport has only 4 incase you don't know runners are the tubes that go from the intake plenum to the intake ports on the head Quote
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