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| | | | Joined: Dec 2009 Posts: 8 New Guy | | New Guy Joined: Dec 2009 Posts: 8 | wanted to know if i could put 248 oversized pistons in my 1939-40 228 block. there both have domed piston tops. i dont have a 248 piston to do a side by side comparison.basicaly i think it comes down weather or not the piston pin size is the same along with the position of the pin in the piston. anyone done this fit before? | | | | | Joined: Oct 2005 Posts: 90 'Bolter | | 'Bolter Joined: Oct 2005 Posts: 90 | I'm pretty sure that all the rods in the early jimmy sixes will interchange.
Is there enough metal in your 228 block to remove without the cylinder walls getting too thin?
Have you considered using a crank out of a 270, that would give you a longer stroke.
Ray | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy redsshed37, an old Wayne high performance chart lists the max overbore for a 228 and 236 engine as 3 15/16", but it cautions that sleeves may be requred to achieve that. You are talking about an overbore of at least 0.15625, and thats just to standard bore pistons [248]. Most machine shops can sonically check a block for cylinder wall thickness these days. The two engines 228 and 248 both use the same height block 11 1/4", hope that helps. | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | The 228 was 3 9/16 bore while the 248 was 3 23/32 bore. The rods and crank are the same. I have seen 228's bored to 248 std. I would be afraid to go oversize. A good machine shop can sonic test the cylinder walls to see how much you can bore. There are lots of 248's around. I would start out with a 248 block and then go .060 over and you know you are within limits. | | | | | Joined: Dec 2009 Posts: 8 New Guy | | New Guy Joined: Dec 2009 Posts: 8 | good to know theyd fit. ill hold off and get 228 overbore or the stock 248 piston. i thought the piston pins looked the same size and placement on piston. | | | | | Joined: May 2007 Posts: 41 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 41 | I have a set of domed 228 pistons that I believe are oversized, but I have to check. I think they are 60 over.
They are also readily available from venolia and egge. I think about 300-400 per set of six.
54Monster | | | | | Joined: Dec 2009 Posts: 8 New Guy | | New Guy Joined: Dec 2009 Posts: 8 | thats way too much for me. ill stick with the $45 to $90 buck new old stock piston kits on ebay.they keep poppn up. i believe the 236 pistons should work also. | | | | | Joined: May 2007 Posts: 41 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 41 | Yeah Egge and Venolia are pricey.
Thats why I bought my used set on ebay when I saw them even though I didn't need them. I paid about $100 for the set, thinking I would use them soon, but the darn 228 justs keeps on running.
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