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Gr8 '48 bow tie 09-22-2011 03:04 AM

250 Inline ????
I have a 250 inline 6 with a one piece head and split exhaust with a TH350 behind it. From day one since I got it, I have heard there are a some problems with that setup but I dont know what they are. The only one thing I was told that bothers me is valves burning due to the close proximity to the exhaust. That seems a little wierd because other inline sixes have the intake and exhaust stacked I/E with no problem for years. maye I am just a little nervous about not knowing all potential problems or lack thereof.
I really want to replace the 216/manual but now I am not so sure.

OneMoreTime 09-22-2011 05:40 AM

Those are good solid runners so I would go ahead with the swap myself. If you want some mods then go to for the skinny on that. There are several early stovebolts here that have the 250 swapped in and you have to really know to know that the swap has been done..

Sam 09-22-2011 05:52 AM

These engines are subject to cracking from exhaust seat to head bolt on center cylinders. Then you get coolant/heat problems and valve seat recession. Almost all engines that have work miles on them will be cracked. Also known for warpage and poor head surfacing from GM.

OneMoreTime 09-22-2011 07:37 AM

learned something..Is there a better head for one of me curious as I have a 250 setting that may be used for something..


Mrwood 09-22-2011 07:42 AM

250 six
I have rebuilt my own 250s for many years now, and have never had a problem with them. Im running one in my 48 chevy now, and im using a S10 5 speed trans behind it and im very happy with it. Never have i had any cracks in any of the 250s i have rebuilt. 09-22-2011 08:11 AM

The later integral head engines will accept the early cylinder heads. But they are not usually compatible with unlead gas. (need hard exhaust seats)

I have done several of these swaps for customers. As uncracked integral heads are unavailable from the local bone yards. My rebuilder suppliers are very proud $$$ of these heads as usable cores are hard to obtain.

The linkages and exhaust have to be changed. If used in an originally integral chassis.

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