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Old 12-30-2009, 09:05 PM   #1 (permalink)
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IH engine tech

I'm building a 34 C1 pick up hotrod. Pirate is not the board for a hotrods so I will keep this to engine tech only. But for an over view I will post up a couple pictures of the truck I am using as a model/guide. We have channeled the cab 6" to hide the frame, chopping the roof 2" in the rear and 3" at the windshield. Bed will be 4' box with a gas tank mounted in there (thinking an acid tank from my radiator shop). No fenders, hoods, or running boards.
OK here's the IH engine tech, I want to keep the truck IH powered (I know I'm a dumb ass) So the plan I have come up with, 304 over bored to 392, then 392 heads (bigger valves sodium filled) balace the rods ect.ect. Feeling is the 304 will spool way faster because of the shorter stroke. I have a 304 at the machine shop, ultrasonicly tested and there is plenty of cylinder wall for the bore. Infact the guys there tell me after the bore, there is more wall thickness than a chevy 350 standerd bore. I know that the intake will be an issue but we are making a sheet metal one for the 671 blower I am keeping the compression down to around 8.5 to 1 because the plan is to run between 6 and 10 psi boost. I just got the blower and we are mocking it all up now. The truck will only weight about 1800lbs and there is no way to get it to hook up and still be streetable. I am using a 6" drop straight axle and a transverse mounted leaf spring, trying to keep the 50s look. I'll post more as the engine build go on, Oh and if this is not of intrest to you hard core wheelers then have the Mods toss it Oh and I am all over tech help and info as this is a winter build and the first for me in all aspects from chassis to well all of it.......
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Old 12-30-2009, 09:53 PM   #2 (permalink)
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Im almost certain that a 304 cannot be bored to a 392 that you will bore into a water passage at some point. I maybe wrong but I thought was the case would hate to see you ruin an engine. I know the 304 and 392 were not the same block.
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Old 12-30-2009, 10:11 PM   #3 (permalink)
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Man READ, the engine is at the shop already bored, wall thickness is more than stock 350 chevy. To clear this up for Super Duper Scout, the bore is about 1/4 inch over stock, to fit a 392 std bore piston, the 304 has a shorter stroke, this would make the engine about 348 cubes. The reason for this is shorter stroke to spool faster than 345 or 392. Read can be done, hardest parts I see is the water neck and distubitor clearance under the blower. This will make the blower very tall on an already tall motor. I have seen a 345 with a blower at the Nats on a Scout but that was a long time ago and I am looking at our mock up, the supercharger, carbs, and air cleaners look like they will be as tall as the windshield.
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Old 12-30-2009, 10:27 PM   #4 (permalink)
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sounds like a neat project. would be interested in hearing more and pics.
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Old 12-30-2009, 10:37 PM   #5 (permalink)
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My mom has the camera, Oh no I mean my wife has it, Ah the batterys are dead, Oppps wrong post. I will post up pictures as we get the motor back from the machine shop. As far as the truck goes I can post up but as I said earlier this Priate. For me this build is way cool and just one more way to enjoy working on and building IH trucks.
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Old 12-30-2009, 11:08 PM   #6 (permalink)
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This will make the blower very tall on an already tall motor. I have seen a 345 with a blower at the Nats on a Scout but that was a long time ago and I am looking at our mock up, the supercharger, carbs, and air cleaners look like they will be as tall as the windshield.
Solution: Drive with your head out the window.

I have no tech to offer. I hate engine work - this is way, way, way out of my league.
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Old 12-30-2009, 11:23 PM   #7 (permalink)
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Who gives a fuck if it's a hotrod. There is a lack of good I.H engine tech out there. Post up.
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Old 12-30-2009, 11:35 PM   #8 (permalink)
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Man READ, the engine is at the shop already bored, wall thickness is more than stock 350 chevy. To clear this up for Super Duper Scout, the bore is about 1/4 inch over stock, to fit a 392 std bore piston, the 304 has a shorter stroke, this would make the engine about 348 cubes. The reason for this is shorter stroke to spool faster than 345 or 392. Read can be done, hardest parts I see is the water neck and distubitor clearance under the blower. This will make the blower very tall on an already tall motor. I have seen a 345 with a blower at the Nats on a Scout but that was a long time ago and I am looking at our mock up, the supercharger, carbs, and air cleaners look like they will be as tall as the windshield.
Cool ass idea..........but I read it as "i'm boring it out to 392ci" also. Not "I'm boring it to fit a 392 piston"

anyhow,tell your wife/mom/battery charger that we need more pics
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Old 12-30-2009, 11:42 PM   #9 (permalink)
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Jet, what color did you finally decide on going with?
And keep the rest of us up to date on this cool ass build.
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Old 12-31-2009, 08:21 AM   #10 (permalink)
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Sorry, I had took it that the bore hadnt been completed yet only tested...misread.
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Old 12-31-2009, 08:26 AM   #11 (permalink)
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id just put a 350 in it, you don't see many of those. aluminum intake, vortec heads, edelbrock, rv cam, and block huggers will make like 650+ HP.


All kidding aside, neat build.
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Old 12-31-2009, 08:50 AM   #12 (permalink)
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I always wanted to build something like this and autocross it. That junk blocking your view is going to suck. If you're still open to ideas a turbo or centrifugal SC'r would be more practical.
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Old 12-31-2009, 09:07 AM   #13 (permalink)
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Who gives a fuck if it's a hotrod. There is a lack of good I.H engine tech out there. Post up.
X2.

1. It's IH
2. It's good tech
3. It's generally BAD ASS

That makes it worth seeing in my book.
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Old 12-31-2009, 11:01 AM   #14 (permalink)
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hardest parts I see is the water neck and distubitor clearance under the blower. .
Go with a distributorless ignition system. You should be able to mock up a MSD crank trigger and box.
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Old 12-31-2009, 12:20 PM   #15 (permalink)
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keep posting jet,it's I.H based and there are more people here who want to see it than not .plus theres not a whole lot of builds going on any way,infact most days here,this place could be mistaken for general chit chat.

i've always enjoyed your posts and your fleet of cool trucks and rigs,i would bad mouth you personaly if you were building such a cool truck with a stock 304,but your not.

anything that is force fed in my book is just plain .still waitin to see if you add a turbo to that cooler of yours
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Old 12-31-2009, 02:09 PM   #16 (permalink)
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anything that is IH and force fed in my book is just plain .still waitin to see if you add a turbo to that cooler of yours
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Old 12-31-2009, 02:40 PM   #17 (permalink)
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Old 12-31-2009, 04:24 PM   #18 (permalink)
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First things first, Super Duper Scout no prob welcome to the IH bar
Okkool77 I'm thinking the paint will be a silver/gray metalic base clear coat. Think it should look good with a satin black powder coat frame, IH red motor & tranny, and a tastful amount of chrome.
OS the crank trigger is a good option, trying to keep the cost some what under control, and I want to keep it kinda old school IH. I sold the Terra I did lots of work on and I have presold the Aristcrat we are 80% complete on the frame off, I am funding my Hotrod on the back of Scouts that I have built/restored and found happy new owners for.
472Scout I have already bought a 671 polished blower, so I want/like the look and whats kooler than the 4" drive belt whine
This weekend we will be putting the 392 heads on the JY 304 we are using for the fitment. We already have the frame boxed, cab channeled, and have it all sitting on the frame jig. I will be ordering the frt axle and rear 4 link kit Monday. Funny thing is I can buy the four link junk cheeper than I can build it. If it were for IH I'm sure it would be way more.
I'll snap a few pictures this weekend when we get the motor and tranny set in the frame.
Chris I also love the pressurized IH motor.
Disclamer Tom Mandera has a ton more experince with the IH over the top motors, Sooo I have enlisted him on the motor end of my build. We chat about the cool factors, power needs, and this should do the trick. I don't want an all out race motor, more like a rad cam, low compression, pressurized moter that will be a good driver. One of my biggest fears is on first start up a back fire and a $3000 blower in peaces WTF got jump once in a while. I'll post up as we progress, hope to have it complete by RMIHR, but that may be wishful thinking. Still working on the Aristcrat and a day job also.......Robert
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Old 12-31-2009, 06:06 PM   #19 (permalink)
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One of my biggest fears is on first start up a back fire and a $3000 blower in peaces
Don't worry about the backfire, it will only warp your rotors, damage the case and stretch the aluminum bolts.

Just make sure your backfire valve is lightly greased on the sealing surface and not overtightened. I made a plastic seal for mine as the paper type gasket seal would stick to the aluminum and tend to not release. It still will push flames up and out the fuel injection, so just don't lean it out!

If your carbed, that should get your carburetors burning.
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Old 12-31-2009, 10:51 PM   #20 (permalink)
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the supercharger, carbs, and air cleaners look like they will be as tall as the windshield.
I like them like this. Visibility sucks, yes, but there are ways to cope with it.

Cool build, can't wait to see the end product
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Old 01-04-2010, 12:13 PM   #21 (permalink)
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Hey Robert -

Would love to follow the whole build if you have that on another site. I have not been here in a long time but Rick pointed me this way - what a cool project.

As to what you are doing with the motor - I am really excited to see how this all turns out. I am interested in what you and Tom have talked about with the crank... Seems to me this is the biggest (literally) issue with getting these anchors spin up quickly.

As to the blower - have you mocked anything up for the intake? I had a small Detroit blower come available a while back, but I was far too afraid to try and sort out how to use it... I am impressed with your ambition - this is going to be sweet!

- Jens from Just Internationals
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Old 01-05-2010, 02:56 PM   #22 (permalink)
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Not to criticize but if you go with an 8v blower like i did it will be a lot cheaper than a 6-71, and its about the same length as the block so it looks nice. I will pm you my email address if you have any questions about blowers, or blowers on IH engines.
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Old 01-08-2010, 09:40 PM   #23 (permalink)
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anything special about bolting 392 heads to a 304?

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Old 01-08-2010, 11:15 PM   #24 (permalink)
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anything special about bolting 392 heads to a 304?
They don't match up....
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Old 01-09-2010, 12:17 PM   #25 (permalink)
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anything special about bolting 392 heads to a 304?
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They don't match up....
Maybe Scoutparts makes an adapter?
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