dwtjr3

If so how do u like it? How much of a difference power wise did u notice? And how much roughly did u spend on the swap?

dwtjr3

Oh sorry forgot to say im going to put 4v heads on my current car and it will have the blower and full exhaust just like my current setup

ctgreddy

you will make more power and it shouldn't cost too much since you can get a mark8 motor for pretty cheap. biggest limiting thing isn't the b heads it's the intake. you'd have to get like a cobra intake then have it ported.

dwtjr3

If I port the intake don't I need to port match the heads to the intake?

dwtjr3

And what are IMRC deletes and will I need to do it? I plan on keeping my current motor and just putting B heads on it

jeh4269

The IMRC's are plates that go between the lower intake and the cylander heads.You can buy plates and delete them yourself or just buy the deletes from MMR.I don't believe your ECU can operate them so you will need the deletes.Each plate has eight holes in it.One for each primary and secondary intake valve.Below 3200 rpm only the primaries are getting air.At 3200 rpm the butterfly valves are opened by the ecu and both intake valves are getting air.To delete them yourself you just remove the rods and butterflies then weld the small rod holes shut.

dwtjr3

Ok thanks jeh I didn't know that

JC316

I had both a full bolt on PI swap and a bone stock Mark VIII swap. The PI setup has much more tire roasting torque in the lower RPM range, but is quickly out of breath. The Mark VIII motor doesn't have much below 3K RPM, but it comes alive after that. Overall, the Mark VIII motor was way faster than the PI.

99 GT vert

yea i went from a pi 2v to a 4v and tripled my power



oh you mean on the same car lol, can i ask why a b heads and not c heads?

dwtjr3

Got them for a good deal, that is the only reason. But it looks like theintake for B heads suck unless the runners r shortened which costs around $700