nickmckinney

Swap the valve covers to COP type, get a MSD switch to run the IMRC, use your current harness and ECM, and stock its not going to make any more power than if you installed a set of cams in your current 2V. B head should stand for "Boost required" as NA they ain't that great.

JC316

Depends really. A 97 Mark VIII motor made 276 to the wheels with a Bassani ORX and Flowmaster super 44's. The cobra motor is rated higher by 15HP with the better intake, so it's not unreasonable to think 285 to the wheels. If you get LT headers and a tune, you could see 300RWP pretty easily. Plus you get a better block and a better crankshaft.

nickmckinney

I have seen this swap at least a dozen times already, I stand by what I originally said. Swap the B for C heads and intake and its another 2MPH in the quarter with nothing else changed if staying NA on the stock cams. You also don't need to worry about the IMRC this way. I have 2 sets of B heads and 5 sets of C style heads going through the shop right now so I have have played with a few of them. B is for Boost, and they are happy happy with a ton of it.

JC316

Oh I am well aware that the C heads are better for an NA setup. I am just saying that it would take more than cams alone to make a 2V equal a stock 4V.

liljojo4711

i dont understand how the 98 cobra 4v engine rated at 305hp is not going to be faster than my 99 gt 2v rated at 260hp... the reason for the swap is because the 4v responds to mods much better than the 2v and if i ever wanted to switch heads there are options such as C heads. there is only porting or the trick flow which are $2000 for the 2v. and i thought i would gain some power just based on stock numbers lol.

so basically if i get the 98 cobra engine i will need the lincoln valve covers from 97-98 marks and all the other electrical stuff is good with a tune. so other than that basically like ur mark VIII swap, jc316?

nickmckinney

The stock motor C swapped cars around here run 110MPH or so with full length headers, we got one at the shop actually that belongs to a worker of mine. Stock B head cars are 107-109MPH just like well cammed 2V cars. We are building a 8000RPM motor for my guys C swapped car, thats where the 4V heads really shine.

nickmckinney

HP peak rating is one thing, HP/torque average is another. You cam a 2V it responds good in the street range (3000-7000) You cam a 4V and its going to 8000RPM if done right. Most people don't want to do the other mods required for that higher RPM range.

You can also get valve covers from a 99 or newer Continental, they were C heads with B intakes and 2 into 1 adapter plates for the runners.

JC316

Yep, pretty much the exact same swap as my guide shows.

liljojo4711

this will be strictly a dd car and its an auto so i wont be going anywhere near 8000rpm. my engine has 205,000 miles right now so i want to get something ready to swap in before i actually have to since its my dd. so i figured if i have to do a swap anyway, y not add some hp/tq for basically the same price or cheaper than a 2v.

more than likely what i will end up doing is just getting a 4v in the car and back up and running until i can afford to get new heads and whatever else and have the car down again. it is my dd so it can only be down for the weekend.