2V vs. 4v
 

I've noticed on some 289s that there is a 2V and a 4V versions. What's the difference? I've noticed that some people are converting from the 2V to the 4V. How is this done? sorry guys but I've got alot of questions I'm going to be throwing at you for awhile till I get the jest of all this. Thanks.

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FOR SALE: 1996 Mustang GTS: 5-speed, K&N, removed air silencer, 3.73s, turndowns after stock H-pipe (no mufflers), 16 inch Mustang GT wheels; 46,400 miles. $11,500

Generally, differences were 200hp for the 2bbl and 225hp for the 4bbl. The K-code 4 bbl was rated at 271.

I'm going from memory, but the 4 barrel versions had higher compression (10 vs. 9.3) and a slightly more aggressive cam. K code motors had solid cams and free flowing exhaust manifolds. I know there are other differences - maybe some one else can chime in?

Nowadays, most 4bbl conversions are done with an aftermarket carb and aluminum intake. For example, I'm using a holley 650 and vintage edelbrock f4b intake on my '65.

Not certain this answered your questions. Maybe someone else can help?

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'91 LX
Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.

Yeah it helped. That's what I've seen people doing and talking about, changing the intake and carb but I wasn't sure about what all was going on and their reasoning. Thanks for the info.

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FOR SALE: 1996 Mustang GTS: 5-speed, K&N, removed air silencer, 3.73s, turndowns after stock H-pipe (no mufflers), 16 inch Mustang GT wheels; 46,400 miles. $11,500

I'm almost positive that the compression is higher, but another idea is that the ports might also be larger on the 4v head, similar to how the ports are larger on a 4v cleveland head than a 2v cleveland head...