Dohc swap mark viii budget build!!!

[98DOHC]

whats up,New to this site Ok so after 5 years of searching the pull it yard found a worthy Mark viii dohc.Wrecked car 100k on it very clean.I will bring you along for the ride pics of wiring..ect..I pretty much know how to do swap wiring no prob.Things and ideas I could really use advice on..THE main thing would be tuning all that work and it don't run right..Second would be intake and Exhaust manifolds? I would like to make it look stock as possible living in ca emission and all thatI'm going to use the 96 stock heads!!What can I use thats not offset to the right beside stock mark intake?Back to emissions will the obd 2 reader pick up on the tuneThis is what I was thinking of going with the aviator intake and exhaust manifolds should be a bolt and go for exhaust and intake correct!! dont know if the intake will mate with the b heads tho.
!!Only thing with aviator is its off to the right..I was thinking about relocating the washer tank for this prob.Anyway this were I'm at now any help ideas will be much appreciated.Like I said I will take you long for the ride posting progress....

Thanks 98dohc

 

[01yellerCobra]

Are you swapping this into the Expy? The Aviator intake won't fit the Mark heads. The Mark uses B heads. The Aviator uses C heads. The ODB II reader won't pick up the tune. It looks for the required monitors to be ready.

 

[98DOHC]

Are you swapping this into the Expy? The Aviator intake won't fit the Mark heads. The Mark uses B heads. The Aviator uses C heads. The ODB II reader won't pick up the tune. It looks for the required monitors to be ready.

Thanks for RE: Yes I have a 98 xlt..Ok so I have b heads..what about the exhaust manifiolds they will fit off the aviator and bolt to my existing stock sohc Thats what i thought but wasnt sure on emission..What intakes can i use any any pre 2001 dohc 4.6 I was think about just using the mark viii and modding a thunderbird sc super chager to it any one think this is do ableAnd what kinda gains could I see from the eaton SC

 

[01yellerCobra]

The 4v exhaust ports are oval and the 2v are round. So the manifolds won't swap. If you have the B heads you can run a Cobra intake.

The T-bird was a V6. You'd need a custom lower intake to make it work. In other words... $$$$$.

What are your goals with the truck?

 

[98DOHC]

The 4v exhaust ports are oval and the 2v are round. So the manifolds won't swap. If you have the B heads you can run a Cobra intake.

The T-bird was a V6. You'd need a custom lower intake to make it work. In other words... $$$$$.

What are your goals with the truck?

Thanks cobra I was just thinking sc charger because I can get them real cheap and the way it set up it flat on the bottom and basically just transfers air on sc .3.8 the forced air is pushed in at the back of the motor just like the mark vii intake.I think if i had a plate made to mount to top of the intake in line with belt to mount the eaton to.think this could work 10 sec expedition eventually

 

[DetroitDarin]

You can have it fast, reliable or cheap - but only two of the three. :-/

 

[98DOHC]

You can have it fast, reliable or cheap - but only two of the three. :-/

I would have to go with reliable and cheap.So I think I'm just going us the stock mark intake.What manifolds can I use beside the stock mark ones??with the b heads?and what tuner should I get and do the tuners come with a tune for supercharger?
Thanks for re..

 

[01yellerCobra]

I believe the 03/04 cobra manifolds will bolt to the B heads. I've seen them on 600hp cars. You'll want a custom tune for your combo. Your best bet will be to find a tuner and then find out what software they use.

 

[98DOHC]

I believe the 03/04 cobra manifolds will bolt to the B heads. I've seen them on 600hp cars. You'll want a custom tune for your combo. Your best bet will be to find a tuner and then find out what software they use.

Question the motor i got had the coil pac smashed against the cam gear dont think its damaged but think i should change any way???Will my sohc chian and gear work to replace.

 

[01yellerCobra]

There's a difference in the cam gears in the early mod motors. I don't know when, but at some point they changed from press fit gears to bolt on gears. The SOHC chain might work but the cam gear is probably different.

 

[98DOHC]

can I use a mustang tuner

 

[01yellerCobra]

No. The tune has to work with with your ECU code.

 

[GAINMOB]

or go to a shop for a custom on the spot tune and dyno

 

[98DOHC]

THANKS everyone for the re's...Ok just ordered the aviator exhaust manifolds from what i ive read supposed to bolt too stock exhaust..The only thing I can really use for budget.. Ok this where at now going to get the rest of the parts to make my beast run this weekend..minus tune..I thinking for now and to work out any bugs to just run the 19# inj. and maf from my sohc to make it run with out issue of corse with a irmc delete for now..I no I no ... I'm not taking advantage of that big 4 cammer.Its just temp..NOTE; Just throw this out there this will work right with out tune..Every thing sohc ran to the dohc comp wise..I know fuel ratio wont be right time should be sound right...

Thanks

 

[98DOHC]

This is were I'm at now think this going work with right tune lot of customization might be able to squeeze 400 HP outta her...Going stock for now need extra grand in budgie make this work..note

[ATTACH]9330.vB[/ATTACH]

I'm only 5 hun in..

 

[98DOHC]

This is were I'm at now think this going work with right tune lot of customization might be able to squeeze 400 HP outta her...Going stock for now need extra grand in budgie make this work..note

[ATTACH]9330[/ATTACH]

I'm only 5 hun in.. sorry dont know why its twisted neck breaker its worth the pain though...lol..

 

[98DOHC]

only thing is how hell am I going turn this thing,, Note Iac is on the tb...

 

[toms89]

Wow..

I hate to say this but I think you are going about this all wrong. Purchasing parts, even if at low cost, in hopes of making them work together. This can involve a lot of fabrication just to make it work making it impractical and likely with less than desired results.

The 5.4 dohc available in the lincoln navigator which is essentially the same vehicle would be much more practical vs the 4.6 dohc. Should be much easier to make work. The M90 supercharger is also smallish for displacement of the V8. I would recommend the M112 from the lightning. As an added bonus the whole upper intake assembly will work on the 5.4 but you would need adapters to make it work with the dohc 5.4 heads. The lightning assembly cannot be adapted to the 4.6 unless you do a complete custom intake and most likely deleting the intercooler core. (bad idea) The valley is simply not wide enough.

You really need to research the compatibility of parts and combinations before purchasing parts or creating a plan.

Most of what you are trying to do has been done before but with a navigator motor. Save time, money, headaches and go with a proven combination. Research!! Even with the proven combos there is much work involved making it all work together seamlessly. Fuel system and tune will have to be customized to your combo. Then assuming you make the power you desire you have to be concerned with the rest of the drivetrains ability to handle it reliably.

 

[98DOHC]

Wow..

I hate to say this but I think you are going about this all wrong. Purchasing parts, even if at low cost, in hopes of making them work together. This can involve a lot of fabrication just to make it work making it impractical and likely with less than desired results.

The 5.4 dohc available in the lincoln navigator which is essentially the same vehicle would be much more practical vs the 4.6 dohc. Should be much easier to make work. The M90 supercharger is also smallish for displacement of the V8. I would recommend the M112 from the lightning. As an added bonus the whole upper intake assembly will work on the 5.4 but you would need adapters to make it work with the dohc 5.4 heads. The lightning assembly cannot be adapted to the 4.6 unless you do a complete custom intake and most likely deleting the intercooler core. (bad idea) The valley is simply not wide enough.

You really need to research the compatibility of parts and combinations before purchasing parts or creating a plan.

Most of what you are trying to do has been done before but with a navigator motor. Save time, money, headaches and go with a proven combination. Research!! Even with the proven combos there is much work involved making it all work together seamlessly. Fuel system and tune will have to be customized to your combo. Then assuming you make the power you desire you have to be concerned with the rest of the drivetrains ability to handle it reliably.

OK thanks for re.so I know you been down the road with a 5 k budget..I'm tryn do this build for less than a grand at this point I am at 450 including aviator exhaust manifolds let you know if its a direct bolt to stock..pretty sure it will work fine with what I got going start this weekend..The only worries I have is if the 96 mark viii intake will hit the the fire wall..I could use the 97-98 intake of cobra..but I plain on force feeding it with that charger which 93-96 intake has the same input design ad the t bird it came off of..If it won't work it makes a nice shelf piece.. lol.pics coming soon..

 

[toms89]

My cost actually shot well over 5K. But I am not suggesting you follow my build. Suggesting you research compatibility of parts. Parts that are used in the expedition chassis such as the navigator dohc 5.4 are guaranteed to bolt in. Then the lightning supercharger assembly can be modded to work with it via adapter plates. Using a V6 charger on a V8 will obviously negate using the intake in which the intercooler core is generally located not to mention it is too small to feed the V8 as efficiently.

Unless maybe you are bolting the V6 into the expedition. Not really sure!?

I do wish you the best of luck but a $1,000 build will be tough with what I understand that you wish to do.

Look forward to your photos!

http://victorylibrary.com/supercharger/super-eaton-data.htm