413 questions

[snakeoil24]

Call diamond Pistons they will make you a set. Sure its not cheap but you will get them

 

[Garys1969RR]

I believe the compression height for the 413 would be the same as a 440, to achieve o deck clearance. That is, piston coming exactly even with the deck at TDC. That distance in these motors is 2.077". The KB 236 for a 440 has a compression height of 2.057". That leaves a deck clearance of .020. I think there is one has a C/H of 2.061. That would give a deck clearance of .016 which is about as close as you gonna get in a flat top for a 440. So what you need to look for is a 4.19" diameter flat top piston with a C/H of 2.077 or more. If you go .060" O S then you are at the bore size of 4.25", right? And that is a 383 stock bore size. So guess if you found a 383 piston with a C/H of 2.077" you would be in luck! But probably not gonna happen. Lol So just tryin out a few numbers, maybe some one will come up with a new idea. I like the old 413s too.

 

[Garys1969RR]

Actually, the KB 236 is a step head design with a C/H of 2.057. The KB 237 is a flat top with a C/H of 2.067. Giving a piston to deck clearance of .010" . Find a 440 block, use the 413 crank and rods, and then you have access to alot of mass produced pistons. At a pretty good price.

 

[Moparmatt72]

Well don't know to much about these motors but if they are a 7.5:1 motor could also fab up a supercharger or turbo run low boost but make some sweet power. If you can bump the c/r up to atheist 8 would be better. Diamond I know for a custom set I'm looking at for 8.5:1 they sad $1300, Ross is right around the same but that's also for a 4.500 bore too.