blew up motor

[szokejohn2]

will my new motor handle stock pistons,running at 5000 rpms.the engine before blew because the timing was advanced too far forward.broke the top of the pistons...the engine is a ford 490

[MudPumper]

YOu should post this in the gearheads section.

[058]

Originally posted by szokejohn2
will my new motor handle stock pistons,running at 5000 rpms.the engine before blew because the timing was advanced too far forward.broke the top of the pistons...the engine is a ford 490 You mean 460, don't you? The cast pistons may hold up at 5K but you would be miles ahead if you ran forged pistons. I ran a stock 429 in a flat for a short time and spun it to 5800 many times but when I pulled the engine out and dropped the pan there was a couple of pieces of piston skirt in the pan.

[Squirtin Thunder]

058,
Whos pistons do you recomend ROSS or PROBE ???
For a .060 over 429ci Ford.
Hows light wieght pistons are the lightest ???

[058]

For a jetboat engine that isn't going to be spun over 5K-5500 I would recommend Speed-Pro, the weight is close to a stock piston, they are reasonably cheap and are plenty strong enough to handle anything you can throw at it. The premium pistons are light weight and are prob. overkill for your engine. You'll only need to be concerned about piston weight when you get into the 6500-7000 rpm range. Try Summit part number: TRW-L2366-F60 [flat top/429] latest price I have is $319.60

[Tinkerer]

You say that you broke the top of the piston.
Did it break above the top ring?
If so I would say that whoever put the engine togeather got the ring end gap too tight and it stuck the rings and this broke the pistons.