Posts: 42
Joined: 9/17/2003 From: United States Status: offline
I am trying to put some bigger pistons in my 6 cylinder, until my V8 gets rebuilt. I really don't know anything about pistons, so I can't find some new pistons (to add horsepower) because I don't know what will fit and what all these numbers mean. So anyone out there that can help, please do. I have copied this from a website, if you could just explain so of the basics to me I would greatly appreciate it.
Cast-aluminum piston for 1963-1980 200 and 250 L6 engines. Piston with 2.25" diameter head recess 0.093" deep. .030" oversize.
Posts: 8826
Joined: 9/2/2003 From: United States Status: offline
You cant use oversized pistons unless they fit the oversized block you would have to have. There is no real gain, save for maybe 2 - 3 hp in going with a .030 set of pistons, so its not worth doing just to get the hp gains, since it would require a complete rebuild to do. The only thing you could do without machine work with pistons is get a set of higher compression pistons. Again, on an otherwise stock motor you wont see much difference, maybe 10 hp if you go a full point higher. Not worth a complete rebuild.
uh oh..your not taking advise from MD are ya?*L* just put in a 300 six...you'll be pulling stumps in no time there is lil hp to gain with oversizing...you would do better in shaving the head and putting bigger rockers on the ole 6 any finding a nice 2 bbl carb with a header still you might pick up 25hp or so
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Bigger Pistons - 
there is lil hp to gain with oversizing...you would do better in shaving the head and putting bigger rockers on the ole 6 any finding a nice 2 bbl carb with a header still you might pick up 25hp or so
