Hi

I have searched around so I just need to make sure of this

I am busy with a b20b non vtec build up I want to get the pr4 head.

Now apparently there were 2 versions and the 1st one had a slightly restrictive flow

So according to the searches the PR4 I should be looking for is from modes 94+ right ?

Here is a comparisson of the port sizes, this is why I want the pr4 and I will also be upgrading the valve sizes too !!!






Thanks

 

Did you perform this test? I would like to see the P8R head.

 

no sorry I didnt do the test

but can anyone confirm the which is the restrictive version of the PR4 Head ?

 

bump please guys need help with this