hey.

Just wondering which is better from the bigport and smallport 4ages.

 

Which is better for what sort of driving.

Pros and cons of both.

And peoples personal preference.

In stock applications, smallport is better. Newer, more powerful, less thrashed etc etc. Some people swear by the bigport, but they're starting to get quite tired now, they have a significant torque hole down low (even with TVIS) and run out of breath earlier than the smallports too.

 

If you're going to modify them though, then the story can flip - a lot of people say that the bigport head is better for forced induction, and the early (3-rib, bluetop) bigports have lighter internals which are better for high-revving worked N/A applications. Much of a muchness really.

Big port Blue top has a 40mm Big end crank which can break, have seen this in a MR 2 which had 140,000 k's only.

They break through No 4 big end.

the small port is a far better engine.