help on decubing Ih llss January 14, 2014 01:36PM
I'm looking for some beginner advice, I have been getting ready to build into a llss, and my plan is to de stroke a 414 Ih on alcohol. In doing this, am I ok to use the ih rods as long as they're hardened? Do I really have to use aluminum rods? Also what about using diesel pistons for the time being? Just looking for some thoughts and suggestions on how to go about it, thanks.
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Re: help on decubing Ih llss January 14, 2014 02:46PM
That motor is 4.3 bore and 4.75 stroke . How much stroke are you planning to take ot to get to 370 ci?
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Re: help on decubing Ih llss January 14, 2014 02:59PM
Strictly looking at the numbers
Keeping the stock 4.3 bore you need a 4.25" stroke to get 370 cubes.
Keeping the stock 4.75 stroke you need a 4.0625" bore to get 370 cubes.
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Re: help on decubing Ih llss January 14, 2014 03:00PM
to keep the 4.3 bore he needs to lose 1/2" stroke , and if your spending that kinda $$ for de-strokin , why not buy a good set of rods and pistons ? if you de-crease bore then your intake valves will hit the sleeve , not much clearance as it is ! thats my 2cents
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Re: help on decubing Ih llss January 21, 2014 08:27AM
You could run the 300 series block and hit 370 cid really easily. 312 crank with Darton common 4.25 sleeve blanks and a set of deere 4.25 pistons will do it. Plenty of good 300 series engine parts out there, and with the 4.25 bore, rods are easily pulled out the top, and a respectable intake valve can be achieved.
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Re: help on decubing Ih llss January 22, 2014 07:19AM
If your going to build a red one put a 5.9 cummins in it. Its been proved that any other combo cant run with it.
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Re: help on decubing Ih llss January 22, 2014 11:51AM
cummins are a lot cheaper to work with. I wish I would have went with another cummins instead of the dt361 I just built I .if you need cummins ih or ford engines give me a call and also the Detroit style engines out of busses 270 566 2901
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Re: help on decubing Ih llss January 22, 2014 01:11PM
So what possible special part of a Cummins makes it so much better?
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Re: help on decubing Ih llss January 22, 2014 01:21PM
Why not use a DT 360? Easy to find and very durable
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Re: help on decubing Ih llss January 22, 2014 03:00PM
Bottom end of a Cummins is very strong out of the box.
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Re: help on decubing Ih llss January 22, 2014 03:30PM
What about using a D360 from a 766? Far from an expert, but it seems to me you'd keep a good head design, a bore that won't have valve shrouding issues, and have stroke, so important late in a pass. If I'm wrong, as always, I appreciate the schooling.
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Re: help on decubing Ih llss January 22, 2014 04:13PM
The Cummins is newer technology. Almost everybody works on them, making parts cheaper.
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Re: help on decubing Ih llss January 22, 2014 11:29PM
After working with both engines in this same application, do yourself a favor and use the DT. GMS has done quite a few of these. Call them. The DT is a great engine and very simple and strong.
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