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Unread 01-24-2011   #1 (permalink)
95tbirdv8 is offline Rookie


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Default 1995 Thunderbird V8 4.6l conversion from sohc to dohc

Okay i bought my first car a 95 ford thunderbird lx v8 4.6l sohc

and i want to upgrade it so i was looking and i found out that mustang and mark viii engines are the same as mine i also found out that the heads on a mark viii have 32valves and dohc so i want to know 4 things

1. what are the tools required to do this conversion from SOHC[ singal over head camshaft] To DOHC [dual overhead comeshaft]

2. what parts would i need

3. what modifactions will i need to make to the engine

4. Has anyone ever done this and if so can yo post some pictures

i am a Freshmen in high school but i am 15 turning 16 plus i go to tech school so i am in automotive technology so alot of tools are availble to me

THANK YOU
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Unread 01-25-2011   #2 (permalink)
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I think the general consensus on this conversion is that it's much easier and time efficient and likely cheaper to just swap in a complete 4V engine, along with ecu and some other minor things that escape me at the moment. Might also need an aftermarket cowl hood for your Bird because I'm pretty sure the new engine is a little taller than what you currently have, although an engine from a Mark VIII might fit without a new hood. Pure speculation on that one though.
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Unread 01-25-2011   #3 (permalink)
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Go to www.tccoa.com

They're the Thunderbird experts, and there's some really smart guys over there.
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Unread 01-25-2011   #4 (permalink)
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I second the Tccoa motion. I'm a member over there, haven't posted in a long while though. I've had myself a t bird and 2 lincoln Mark Viiis with the DOHC in question.

The general consensus at TCCOA is to swap a complete 4.6 out of an explorer and go forced induction in your car if you want to make 3-400hp. The power advantage of the DOHC isn't worth the cost if you're going to keep it relatively stock. Unless you get wild, or want a really fun project, I wouldn't do it.

It would be much easier to swap and entire DOHC out of a Mark VIII. as was mentioned before. A few people have done it. Depending on what intake you use, the stock hood may or may not work. Check out TCCOA for what others have done.
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Unread 01-25-2011   #5 (permalink)
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You can run a 93-96 Mark VIII stock intake with no engine clearance problems.

I think it's actually a worthwhile swap in the 94-95 TBirds. Their stock 4.6's put out a whopping 155-160rwhp, compared to the Mark VIII, which puts out around 230rwhp bone stock. Add headers and get rid of those crappy exhaust manifolds with the built in converters during the swap, and you can put down 250rwhp with no other mods.

You can do the swap for under a grand, plus the headers, and put down 100rwhp more. Not a bad deal at all.
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Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
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Unread 01-25-2011   #6 (permalink)
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I try to post something at tocca but I was told acess denied so I tryed here and so what your saying Is to swap the engine out in stead of swapping the heads and what about the intake manifold it won't fit under the hood??? Plus I would also want to put dual exhaust and a superchaer maybe so whats my best option now:smilie
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Unread 01-27-2011   #7 (permalink)
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The hood clearance issue is if you use a cobra intake, bit taller than the stock intake. I'm not sure why the changed the intake over in 97, the earlier design seemed to make more power... speculation from blowing them away with my 95, could be a less aggressive tune, I'm not sure.

It would be a worthwhile swap if you can find a moderately low mile DOHC for a decent price. It just seems like you'll either be tearing into a $3000 Mark VIII to find one with under 100K on it or getting one with 150k + on it.

Adding some long tubes onto there will tack on another $500 to the price and you'll have to do some surgery to them, more than likely, most definitely will need to modify the position of the steering shaft.

If you're planning on a super charger, a low mileage 2V PI motor will give you the best bang for the $. There are a few kits out there... I think.. it's been a while.
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Unread 01-27-2011   #8 (permalink)
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Kooks makes a set of midlengths for the TBird/Mark VIII chassis that'll bolt right in, with no crazy ****.
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Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
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Unread 01-28-2011   #9 (permalink)
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I think I was looking at those a while back. My friend has a set on his race car, quality goods.
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Unread 07-20-2012   #10 (permalink)
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Default thunderbird dohc

I'm rebuilding a 4.6l. Forged crank,4340 rods and forged non-pi pistons. I have a new set of non-PI heads and PI heads. I would like to go DOHC heads the MarkVII heads. What would You all suggest ? Which would built more power and be streetable ?
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