dippowit-z- Posted August 23, 2005 Share Posted August 23, 2005 I have 71 240 that is rust free. I plan to weld in a full cage to allow for a v-8. I am a Ford person and was thinking of putting a cobra motor in it. Has anyone done or seen this done before. If so how can I get more info on the subject? Quote Link to comment Share on other sites More sharing options...
jbk240z Posted August 23, 2005 Share Posted August 23, 2005 two words........too wide, without cutting strut towers. Quote Link to comment Share on other sites More sharing options...
Guest iskone Posted August 23, 2005 Share Posted August 23, 2005 HIt up the search. That's the first place to start. You'll find that the 4.6 is very wide on the top and could possibly be shoe horned in. Someone here has taken measurments but AFAIK no one has done the swap. Isk Quote Link to comment Share on other sites More sharing options...
blueovalz Posted August 23, 2005 Share Posted August 23, 2005 The engine will fit between the towers (per a string quite a while back), but the issue of the steering arm/exhaust manifold clearance (which can be addressed) was not determined. I'd like to see if this will work as we've had several "nibbles" but no one as yet to take the bait and actually do it. Quote Link to comment Share on other sites More sharing options...
dippowit-z- Posted August 24, 2005 Author Share Posted August 24, 2005 I am a former REBELLO customer. Although very pleased in the past, I think that I may get alot more for 7000.00$ than just a 3.2L six cylinder. I need advise or ideas about different options. I am an accomplished metal fabricator but I do not want to alter the unibody of my car. OK, go... Quote Link to comment Share on other sites More sharing options...
Dan Juday Posted August 24, 2005 Share Posted August 24, 2005 What about the two cam 4.6 motor? Does it give up much to the four cammer? It must offer more clearance. Quote Link to comment Share on other sites More sharing options...
Gollum Posted August 24, 2005 Share Posted August 24, 2005 they're HUGE!!!!!!!!!! (talking about the DOHC) Have you seen one next to a 5.0? They're almost twice as wide, no joke. The heads are about as big of heads as have come on anything and the 4.6 block is wider to begin with. They're heavier too. WAY heavier. Even if you fit one (i'm sure you could) it would have a horrible weight distro compared to a 5.0. Why would you want to do it? I'm not saying you should. I love seeing any type of conversion. BUT, if you're looking for pure performance I wouldn't go with it. Newer cars are getting heavier and heavier, and the motors are sucking up to the challenge. The newer motors are heavier, and beefier, but if you can get 600+ solid HP out of a 5.0, why go with something newer? Sure, a 03 cobra can run 9's on a stock bottom end, but that doesn't mean it's a great match for a Z. Parts are more expensive too. Like i said though. If you want to do it, go for it. You'll get support from people here i'm sure (as much as we can offer over that net that is) but I just don't recomend the swap for the performance oriented. Gratefully, Gollum PS I LOVE the 03 cobra and it's nice to see the mustang back competing with the stock stangs of the 60's. And the new gt500 should SO have a SVT badge.... GRRRR Quote Link to comment Share on other sites More sharing options...
blueovalz Posted August 24, 2005 Share Posted August 24, 2005 As I said, I'd like to see someone go where no one has gone before, but the 5.0 is about as efficient (in terms of weight, size, and power) as you can get. The 351W is really the same motor except a higher deck height and width (what...1 1/2" at most?). I like the 4.6L on paper, but in the real world, the older 5.0 or even an LS1 is where I'd focus my attention. Quote Link to comment Share on other sites More sharing options...
24 oz Posted August 25, 2005 Share Posted August 25, 2005 my dad has a 99 cobra and its basically the same engine as the 03 but not supercharged and i know that it has an all aluminum block and aluminum heads so it has to be pretty damn light. If you want my opinion use the cobra engine there sweet engines and ive never heard of anyone using one before. I know if i could ever get my hands on one i would use it so go for it Quote Link to comment Share on other sites More sharing options...
jnewby Posted October 27, 2005 Share Posted October 27, 2005 the 4.6 is all aluminum so i think it would be beter, i was thinking of doing this swamp but am doing a big block chevy instead. if u need pictures i will get them 4 u since i have the same motor in my sleeper lincoln yes it is DOHC not SOHC like the whimpie GT's. jhhnwby@yahoo.com Quote Link to comment Share on other sites More sharing options...
TomsCoupe Posted October 28, 2005 Share Posted October 28, 2005 the 03-04 cobra blocks are made from cast iron, so it is not all aluminum. those engine weigh 600 pounds(cant remember where i read that, maybe MMFF), with the block weighing in at 190 pounds alone( i have one sittin in my bedroom). They have cross drilled 4 bolt mains, and the DOHC engine are much better than the SOHC engines. The DOHC engines have 32 valves, 4 per cylinder, and the SOHC engines have 16 valves, 2 per cylinder. Quote Link to comment Share on other sites More sharing options...
Guest 73Turbo240z Posted October 28, 2005 Share Posted October 28, 2005 the cobra engine is also prone to detonation on account of heat soak of that cast iron block... which would be compounded by the Z's engine bay not being very proficient at moving air through it... creating a hot pocket encouraging heating. Quote Link to comment Share on other sites More sharing options...
TomsCoupe Posted October 28, 2005 Share Posted October 28, 2005 Id sooner stuff an q45 engine in there. all aluminum, 6 bolt mains, and LOTS of room for improvment. Quote Link to comment Share on other sites More sharing options...
Supra510 Posted October 28, 2005 Share Posted October 28, 2005 LS1, LS6. Lighter, more displacement, you can get them all day on Ebay with a 6 speed T56 for under 5k and that includes the computer a lot of the time. If I had to stuff another engine in my 510 it would be this one. From what I've read re: engine weights recently it's lighter than the 7m-gte I have in there now. Anthony http://www.cardomain.com/ride/674663 Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted October 28, 2005 Share Posted October 28, 2005 like ive said in every other ford engine post. Central coast mustang block for $1900 it is new and makes 300hp, thats not enough then $2300 for 340 and $3000 for 370. More then that hop onto the 351 design it has a beefier bottom end (and weighs about 80lbs more) then the 302's and will make plenty of power. But you have to ask yourself how much you want to make, 500 is about the max on the 302 before you need to do some super beefing, the 351 takes some more. Also, if you have a 7k budget, get a world products block or aftermarket block (from a good company) that is designed to take the beating. The world products one for instance features 4 bolt mains as well as other structural goodies. I would try to stick to the 302 though seeing as it has a good weight and decent power output plus, distributor is on the front (on almost if not all fords) so it can be mounted all the way back, better weight distribution. Quote Link to comment Share on other sites More sharing options...
Guest bojo68 Posted July 30, 2007 Share Posted July 30, 2007 Well, a 4.6 dohc is what's going in mine. If ya look around here you'll find where somebody with the top hacked off a z had one in theirs, showed a few pics but never followed up on what he said he would with the rest of the pics. There were all kinds of comments that it wouldn't fit, along with erroneous measurements, then came the pics of one in place. One guy commented how tight it was, to him I say go pop the hood on a BMW 750il v12, or a jag xj12 for that matter. I think they're EASIER to work on than the factory 6, I can get at the exhaust manifold bolts on a 4.6 dohc in a z and the plugs come out from the top, real easy. More importantly, they seldom need to ever come apart.(they don't loose head gaskets or blocks like 5.0 and l28. To make any real power the biggest problem the way I see it is going to be the tranny, the manuals capable of living are more expensive than this entire project, so I guess I'll either have to see how long a built 4r70w will live, if that fails I'll probably have to choke down buying an adapter to a 4l80e, which are spendy, probably more than another build on a 4r70w. Anybody ever put a viper differential in a z? Any bright ideas on what it will take to make the rear end hook and track straight?(I'm thinking changing the geometry on the mounts for the a arm.) Quote Link to comment Share on other sites More sharing options...
fordsunzx Posted August 2, 2007 Share Posted August 2, 2007 it will fit , if it is a sc motor it has a iron block[for strength] the sc motr is tall. as far as weight without the sc it is lighter than 5.0 the weights you see posted are for complete eng intake ac compr pulleys flywheel... Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted August 4, 2007 Share Posted August 4, 2007 Bojo, any pictures of your 4.6L DOHC in place? Any pictures of clearances? What are you going to do about the steering shaft? I already relocated mine for a 5.0, not sure what a 4.6L DOHC would look like, may be better or worse. Quote Link to comment Share on other sites More sharing options...
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