Mark VIII engine swap

cbsdd · Aug 26, 2010

Anyone ever think of putting a Mark VIII engine in your Stang? Im kinda tossing the idea around.

bhuff30 · Aug 26, 2010

Yes, it has been done and you can find a bunch of info just searching. The Mark VIII intake won't fit against the mustangs firewall, so you'll need a cobra top end. Another option is to throw PI heads and intake on top and enjoy the high compression.

mransr · Aug 26, 2010

isn't there a thread here right now about a guy that bought a Cobra that has a Mark IIV engine instead of the Cobra engine?

edit: here it is http://www.stangnet.com/mustang-forums/821435-anyone-seen-intake-manifold.html

not good news for the orginal poster, but it looks like the Mark IIV DOHC fit OK

crazystang25 · Aug 29, 2010

ya i read that one. i wouldn't mind doin a mark VIII swap in mine. and throw some c heads and manifold on it. not sure how many rpm's the stock mark VIII bottom end is good for though.

Joeking316 · Aug 30, 2010

Im in the process of doing the swap on 1994 Mark VIII motor in a 99GT. Have ran into a few problems nothing major yet tho

cbsdd · Aug 30, 2010

Yeah I'm really not sure which way to go- full Pi swap or Mark VIII engine. I found a guy out in Fullerton who is selling 97 -98' engines for around 950 with the trans and ecu and the harness. Kinda more leaning towards that over the Pi because it seems like you can do more with that block and that engine is already pumping out close to 280 hp.

cbsdd · Aug 30, 2010

Just called the guy and he said he only has a 96' left but he'll sell it for $650. He said he gets the cars from auctions, and that this one has around 80k on it. It's already pulled from the car. What do you guys think?

ninjastang125 · Aug 30, 2010

Mark 8 bottom with 2v heads FTW!!!!!!

Mr. Rustypwnz · Aug 30, 2010

^ damn straight!! id say get some ported pi heads and then use the bottom end of the mark 8..

me and ninjastang125 have this combo and i know i can waste a modded 96-98 cobra, he prolly can annihilate some himself..

cbsdd · Aug 30, 2010

Honestly I'm new to the whole engine building scene so I don't know too much about it. I've done my own mods like headers, throttle body and other bolt on stuff like that before. What exactly is the benefit of using the pi heads on a 4v block? And If I do the engine swap do you guys recommend using a cobra intake? If I just swapped the engine and left it alone other than changing the intake manifold how do you think it would stack up against the 99 and up Mustangs? Is the 280 hp figure close to what Id be making? Sorry for asking so many questions? I don't know anyone else who owns a mustang so I'm kinda working on my own. Thanks.

Mr. Rustypwnz · Aug 30, 2010

well if you swap in the 96-98 intake cams, and the cobra intake, it will actually make a slight margin more than a cobra because they dont have a forged crank like the cobra does.. (takes 10lbs off the crank)

but the benefit of a 4v short block on PI heads is that the compression is right under 12 to 1 with this setup, and it makes for a hellaciously fast, snappy combo..

crazystang25 · Aug 30, 2010

And if u do 2v heads you might as well make them tfs heads. Anyone know how many rpms the stock mark VIII bottom end will spin to with out relieving itself of some rods n pistons.

cbsdd · Aug 30, 2010

Would 91 octane be sufficient for 12 to 1 compression? That's the highest they sell at the pumps out here in CA.

Mr. Rustypwnz · Aug 30, 2010

yes, i have stock cams still and it runs fine of 91, although you wont be able to run as much timing

Mr. Rustypwnz · Aug 30, 2010

crazystang25 said:
And if u do 2v heads you might as well make them tfs heads. Anyone know how many rpms the stock mark VIII bottom end will spin to with out relieving itself of some rods n pistons.

well some n/a cobra guys are spinning theirs 7500, so i would say it could come close, i know ive had mine a little over 7k on the last motor on spray, and that motor went through almost 2 bottles a week for a couple months, but it hit some insane rpms daily.. then the cylinder wall caved in lol

cbsdd · Aug 30, 2010

Trick flow heads look great but are just a little out of my budget right now. Right now I just work part time at Costco. I am a licensed electrician and do some side jobs here and there but there really is no steady work out here now. That's kinda why I would like to keep the entire build under 1200.

crazystang25 · Aug 30, 2010

I feel ya. I work part time at advance auto.

cbsdd · Aug 31, 2010

Thanks man. The economy and job market in CA blows right now.

crazystang25 · Sep 1, 2010

Blows everywhere! But ya I found a guy that has 2 mark VIII complete engines w/ all accessories for $575 each so I wanna scoop at least one from the Dude.

cbsdd · Sep 1, 2010

Not bad. I might call the guy back who was selling it for 650 to see if he'll take 500. As much as I want to do this part of me just wants to save as much money as I can so I can buy a used 5.0 a couple years from now. Idk. I think that If I put in 4:10's and got over 300 hp I would be pretty happy as far as the power and speed goes. I need to look around online to see how much I can get the cobra manifold for.

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