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Dohc 300 I6

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Old 08-27-2007, 06:18 PM
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mrl390 mrl390 is offline
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Dohc 300 I6

I posted this on the inline six forum too.

I had this crazy idea a while ago. I want to sometime in the future, build a performance 300 I6 and turbo charge it. There is one bump (or maybe 1000ft cliff) in my plan. I want to put a DOHC 4v per cylinder, cylinder head on. Obviously no one makes anything like it, seeing as how I am yet to find a single performance head for an I6. Is there any possible way that this goal could be reached? Are there any companies anyone knows of off hand that could make such a product? Could it even work? I dont own an I6 engine and never have, but I would be very interested in building such a beast after I graduate, if it were possible of course.
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Old 08-27-2007, 07:51 PM
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Look up some Australian Ford straight sixes. I'm not sure what engine they are based on, but the newer ones (still produced now) are available with overhead cam(s) and are available in turbocharged form as well. I don't know that any of those would swap onto a 300, but they might swap onto a smaller I6. It would be a cool project, but would also probably be expensive trying to get parts from Australia.
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Old 08-27-2007, 07:59 PM
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I figure no matter what way you go about the project, it will be expensive. Are the smaller I6's based on the same block? I never even thought about the australian sixes, tho its not like I know any more about them (actually I know nothing about them) than the 300. Like I said this project is one for down the road and maybe by then, I will know enough about the subject to make the project easier. Could you see a 93-95 lightning clone (I wouldnt desicrate a real lightning) with a turbo charged I6 in it? That would be pretty cool. Im gonna search the web about the Aussie sixers and maybe look on ebay. Im sure Ill post anything I find, even if no one really cares.
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Old 08-27-2007, 08:04 PM
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I also forgot to ask. Do you know if the australian sixes were 4v per cylinder?
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Old 08-28-2007, 01:07 AM
85e150six4mtod 85e150six4mtod is offline
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Aussie 6s were the 200-250 block, not interchangable with the 300.

Just the turbo alone will make the 300 wake up.

I seem to recall Ak Miller cutting Cleveland heads up and making a longer head for the 300. Can you weld cast? Got a machine shop?

You don't need dohc with forced induction and you will never spin a 3.98 inch stroke I6 to the point where you need dohc to control the valves.

300s are for stump grinders and stump pullers. It would be cool if there were a kit available to make them suitable for Indy car use, but it would also be cool to find a 5 inch roll of 20's on the bedstand every morning...ain't gonna happen.
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Old 08-28-2007, 09:01 AM
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I was pretty sure they weren't compatible with the 300, but even a DOHC 250 would be a screamer.

They had a few versions of the straight six in the Falcons over there, and I'm pretty sure they were available with 4 valves/cylinder. You'll have to do the research on those though, as I don't know anything more than that.
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Old 08-28-2007, 09:07 AM
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Quote:
Originally Posted by mrl390
I also forgot to ask. Do you know if the australian sixes were 4v per cylinder?
DOHC, VCT and 4v per cylinder


Oh, and turbocharged too
http://www.youtube.com/watch?v=fb9Q6ErB8cw
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Old 08-28-2007, 03:52 PM
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So thats a 4.0 inline aussie six im guessing? Thats pretty cool.
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Old 08-28-2007, 07:12 PM
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yes........
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Old 08-28-2007, 07:49 PM
petes79f150 petes79f150 is offline
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You might give thes guys a call:http://www.cliffordperformance.net/index.html

All they do is the inline 6 stuff.


Pete
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Old 08-28-2007, 08:33 PM
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Wow that site is pretty good. Im putting a shortcut on my desktop. Thanks pete!
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Old 09-07-2007, 02:08 PM
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with enough money, imagination and creativity anything can be done.

start looking at heads that come from engines with the same bore spacing as the 300 six. then with enough welding, grinding, drilling, etc, you could probably get it to fit.

seen an article in either Hot Rod, Car Craft or Popular Hot Rodding on the conversion of 351C heads to fit the 300 six. he basically took 3 heads, cut, welded and modified into one 6 cyl head. made pretty decent power also in the end, but a lot of custom work to do it. the biggest thing is to get the same bore psacing, after that, just a lot of custom machining and welding to get it to fit.

would be very cool when done though.

rgds
Mike
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Old 09-07-2007, 05:34 PM
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You'll need access to the following a draftsman, pattern maker, foundery, one good machinest and a few more plus a lot of spare cash. No one ever ask George Riley, or Duntov what the first workable head/ heads they made cost, even back when skilled labor was fairly cheap. kotzy
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Old 09-10-2007, 12:44 AM
91 F-150 Farm Truck 91 F-150 Farm Truck is offline
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That motor almost took my breath away.... Just imagine what it would do with a ford 9 inch behind it.
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