6.7 cummins April 06, 2022 08:23AM
What factory 5.9/6.7 Cummins engines are the best to use for pulling?

Do the 6.7 Cummins hold up as well as the 5.9?
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Re: 6.7 cummins April 06, 2022 11:32AM
5.9 blocks can handle more is what I been told and the early 5.9s are 14mm main studs newer ones went to 12mm.
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Re: 6.7 cummins April 06, 2022 11:16PM
Pre-97 Encore 5.9 blocks in stock form are strongest, as they had 14mm main bolts as opposed to 98+ storm blocks that were 12mm. 6.7 block is better with a deck plate and the main bolts opened up to 14mm or 9/16. Also the 12v and early 24v engines had better rods in them. Depends on your HP goal. Anything under 1000-ish horsepower a stock 5.9 12 valve with some bolt ons will be fine. Over that think about a 6.7 block with a deck plate and some billet rods.
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Re: 6.7 cummins April 07, 2022 12:14PM
Is there any difference in the ag blocks or the natural gas/lp blocks?
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Re: 6.7 cummins April 07, 2022 01:41PM
Rumor has it the international casted 5.9s are stronger found in some pre 1998 dodge trucks.
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Re: 6.7 cummins April 08, 2022 01:31PM
no
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Re: 6.7 cummins April 08, 2022 04:28PM
ok, what cylinder head are the llss on alky using? diesel head converted or lp?
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Re: 6.7 cummins April 09, 2022 12:04AM
12 valve diesel converted.
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Re: 6.7 cummins April 09, 2022 01:34AM
The heads are the same except one has spark plugs
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