I am not familiar with that engine it may be a aftermarket tuned engine. But I may just not have heard about it yet.

Also the newer 5ports feature the same head cuts as the 7port engine that picture shows the older head.

Naz I have never used the 3 needle carb. did you havethe problem when youwere running the O.S. carb or only with the Go carb. You may need to adjust the mid speed needle a little to get the bog out. If it s lean bog or a rich bog it maybe in the LSN and HSN needle balance.m