masterofthepuppets99

the 97-98 MK VIII heads are the same castings as 96-98 cobras. the MK VIII from 93-96....i dunno. 93-96s also have a different intake manifold than the 97-98s, which i have heard flows more (not as much as 96-98 cobras). the 93-96s did not have beehive valve springs although the heads themselves may have been the same, not sure on that.

JC316

Not yet, but it gets plenty of exposure. Thanks for the compliment.

Nope, not really. The 93-96 heads have shrouded valves, the 97-98 and the Cobra heads don't. The intake cam is slightly different on the Mark VIII as well. Lemme see if I can find the comparison pics of the shrouded and unshrouded valves.

1999mustang2000

could you please take pictures of what all your coolant hoses look like thats running from the radiator and etc i am in the middle of this swap and i have no clue how there susspose to be ran

JC316

CRAP! Sorry that I missed your post man, I normally don't. If you still need them, I will get them ASAP.

I helped another guy out with a swap and he gave me the results of a dyno pull.

All motor, GT tune, nothing but a bassani ORX and flowmaster catback.

276HP@3800RPM
288ftlbs of torque@3500RPM.

I was shocked to say the least. Not only at the RPM's, but the power to the wheels.

AJB540

Do you know how many miles these engines are good for? I currently have 112k on my 96 GT, and the Mark VIII engine I found has 110k.

JC316

I had one with 196K miles on the original engine and it was still going strong. I have seen Mark VIII's go 300K without a rebuild.

liljojo4711

any updates as far as numbers on the track or dyno? im gonna get serious about this swap now. i want the aluminum block and 4v potential for a 500hp max street monster .

JC316

On mine no, but I helped a guy do this same swap. The only difference between him and me is that he has an ORX and flowmasters. He made 276/288 to the wheels. He ran a 15.1, but he was on 2.73 gears, which are crap for a 4V.

masterofthepuppets99

so a factory 96-98 MK VIII engine with a high flow mid pipe laid down 276hp/288tq. NICE! i wonder what im gonna be puttin out when i get mine dynoed

JC316

Yep. It was a completely stock 97 Mark VIII engine with an EGR delete. Stock GT tune, Bassani ORX, and flowmaster super 44's. I ran a 2010 Camaro SS automatic on an empty highway and BARELY lost. I mean, my fender was at his door and that was with non 4V friendly 3.27 gears.