I have a 2000 5.4 2v from a truck. Can i use the 4v heads from a nav or shelby on this motor. What else do i need to change if i change the heads timming cover etc. Thanks chris
conversion question!!!!!
rxnodoze02
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I have a 2000 5.4 2v from a truck. Can i use the 4v heads from a nav or shelby on this motor. What else do i need to change if i change the heads timming cover etc. Thanks chris
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yes you can grab some 4v heads. dunno bout the other stuff though as im not too edumacated in the 4v area.
btw i would grab a set of shelby heads if you have the choice between shelby and navi. navi is the low man on the totem pole as far as 4valve heads go.
btw i would grab a set of shelby heads if you have the choice between shelby and navi. navi is the low man on the totem pole as far as 4valve heads go.
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i know but shelby heads will be a few bucks more. I could prob find a set of nav heads much cheaper. Are the cams the only diff in the heads or are they ported diff to. Yeah I really want to know if there is anything else. let me know if you learn more thanks
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the ports are different as well if i remember right. you will have to get the adapter plate for them. the navi heads are good heads and more beneficial on a 5.4 application over a regular c-head. you will have to run a navi intake, ustom intake, or a sullivan piece.
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the modular heads will interchange on amy modular block. as for the heads. you say 96-98 cobra heads, and set of 96-98 mark 8 navi heads? uh :wtf the 4v heads up to 98 were all b-heads, the 99+ were c-heads. if you run a b-head on a 5.4, you will have to have the intake widened for it as well.
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b heads are ok for boost or a high rpm race motor...personally i would look for a good set of C heads from a 99/01 cobra or a mach or an 03/04 cobra
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yeah there was a post comparing all the heads saying that the best heads were 00R heads. I like the idea of the 96 heads tho. They stated that the intake was a full 55cc larger than all of the other heads. While this kills low to mid range power but really helps in high rpm and really shines in the case of a supercharger. I think that is going to be the road I want to walk down tho.Plus the 03 cobra, Aviator etc heads go for a lot more money I dont want to be cheap but its a big diff. If i could find them at a good price i would pick them up right away. Let me know what you think thanks
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the 5.4 will benefit from all the extra air it can get. you will save going with the b-heads, but will tie up some money to have a cobra manifold modified to fit the 5.4 as well. persoanly, i would do a set of navi heads, and a sullivan intake as well depending on what kind of set up you go with.
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Which one are we speaking about Exhaust mainifolds or intake mainfolds. Im assuming the intake. If so I would use the 96 cobra heads and the intake on the 5.4 block. 96 heads heads would love the volume of the 5.4. Plus Cant I use the IMRC plates to solve the low end part a little. Then you could port the exhaust bc that were those heads fall short. What do you think Thanks
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to my knowledge, the pre 99 navi's were all 2v's. i am not sure if there were any 4v 5.4's made that were b-head 4v's. even if so, the runners will be long and choked so doing the swap wouldnt benefit. you will have to have a cobra intake modified to fit.
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The heads would be from a 96-98 cobra and I would put them on the 5.4 block and then go with the cobra intake. What direction would you go with electrical . Would a 96-98 wiring harness be a good start
Just remember you will have to have the Cobra intake cut in half and widened to fit the 5.4 if you use the 96-98 Cobra heads. Its not just a bolt on affair. However, if you use the Navigator heads, you can use either a Navigator intake or a Sullivan intake, both which will require no modifications to bolt on, but will vary greatly in performance from each other depending on your goals.
Ken
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I dont understand if you have 96 cobra heads why cant you buy a 96 cobra intake to match and bolt right on? Deck hight ? bc of the 5.4
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I believe the deck height it taller so the spacing between the intake ports is larger.
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Think of it like this...
This is a 4.6 - "v"
Here is a 5.4 - "V"
Look at the space between the two highest points of the "V"s... The 5.4 is wider. Hence the 4.6 intake wont bolt on to the 5.4 Block/head combo. You can use a 5.4 intake (Navi) though. But from what I hear... it doesnt offer the performance that the 4.6 (Cobra) intake will.
This is a 4.6 - "v"
Here is a 5.4 - "V"
Look at the space between the two highest points of the "V"s... The 5.4 is wider. Hence the 4.6 intake wont bolt on to the 5.4 Block/head combo. You can use a 5.4 intake (Navi) though. But from what I hear... it doesnt offer the performance that the 4.6 (Cobra) intake will.
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ok so it is the deck height. There is no other intake that will bolt right on? Does anyone have a pic of the 96-98 cobra inake modded. thanks
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Cool thanks what about the IMRC plates im I gonna have a problem finding them for the 96-98 cobra. I read a post before and they were saying how hard it is to find them for the cobra bc its electronic not air actuated like the ones for the navi heads.
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