biggest bore on a 413

Quote:

---

hey guys just wonder if you can open up a 413 block to a 4.325 bore and how many are using this block with combo's and spec ........thanks

---

Highly unlikely, unless you use an industial block
or motorhome block. The pass car blocks may be opened to 4.250 with a narrow safety margin. This may be due to core shift/rusted bores or even overboring damaged cylinders. Sonic check to be
100% sure and then be careful with the overbore.
You may or may not get a 440 sized piston bore,
but a 426 wedge piston size is abit more do-able.
Safety is the key. Think about it when you add
more compression/cylinder pressure, rpm and maybe
bolt on "power adders". Things CAN get disasterous
if the motor lets go! If you really want a 4.325
block, buy a used 440. You would be gaining even more overboring it! 413's are great, don't get me wrong, but for what you want to do 440's would be
better. It's a gamble for the 413 due to it's age!
Good Luck!!

Quote:

---

We have done quit a few over the years and sonic test as well but never exceed 4.250

---

100%
That's what I figured also, just too much of a
wear/core shift factor to deal with on those
pass. car blocks. If you need the cubes, lengthen
the arm (stroke), but don't go crazy (undersquare)with it. Thanks for the input BG.

Quote:

---

I have two industrial 413's sitting in my garage.

---

hehehe ..... I gots NINE of them ...

Quote:

---

Hay Jeff ...put a SOCK in-it ! ....

WHY do you think I have NINE of these .... and I have another SIX to pick up at a JY. And two more down-state.

I was not going to break-this-news uNtil I had the whole market bought-out !




..............OOPS, Sorry LOL!!! I guess it just depends on who you want to believe.

I think that I will start looking for low mileage 440's now that NHRA/IHRA has allowed us to go .075 overbore legally.

JEFF

---

No disagreement Jeff,we are referring to the standard 413 blocks,not everyone has access to the industrial blocks.We have a few and they are a heavy block and as we now know,someone has been buying them all up and hoarding them to control the market.

Quote:

---

Hay Jeff ...put a SOCK in-it ! ....

WHY do you think I have NINE of these .... and I have another SIX to pick up at a JY. And two more down-state.

I was not going to break-this-news uNtil I had the whole market bought-out !

---

Hey Doc, can I INVEST!!

Quote:

---

Found this pic of a block. Supposed to be a 426 Industrial? Got it from an Ebay auction about 4 years ago so I don't know anything about it.

---

What's the pad over by the front of the left
cylinder bank say. Or the numbers on the side of the block juxst above the block plugs. Sometimes
the numbers are stamped in back of the engine.
Not a bad find at all!! GOOD rugged block!!

Quote:

---

Quote:

---

Hay Jeff ...put a SOCK in-it ! ....

WHY do you think I have NINE of these .... and I have another SIX to pick up at a JY. And two more down-state.

I was not going to break-this-news uNtil I had the whole market bought-out !




..............OOPS, Sorry LOL!!! I guess it just depends on who you want to believe.

I think that I will start looking for low mileage 440's now that NHRA/IHRA has allowed us to go .075 overbore legally.

JEFF

---

No disagreement Jeff,we are referring to the standard 413 blocks,not everyone has access to the industrial blocks.We have a few and they are a heavy block and as we now know,someone has been buying them all up and hoarding them to control the market.

---

Classic!!

Quote:

---

Quote:

---

Classic!!

---

CLASSIC H-Guy ? ... but sooooo many people say the 413 bore are way tooooo small ...... maybe I have just bought a bunchO junk cast iron

---

Well Doc, I was one of the BETTER infomed about the motor. The were a few around in my family when
I was a youngster. My uncle never told me to sit
back while he was driving his 300's. He just SIMPLY
TAPPED his right foot on the gas, to set me back in the seat!! Junk! I DON"T think so!!
If you want to believe the junk fodder, it's on you! Just send some of those GOOD cores to me!!

Quote:

---

Quote:

---

Doc, there's nothing that a little slice on the
heads and block can't cure!!

---

H-guy ..... a little SLICE ? ....

---

Sure, you know about the SLICE! Something you have to do also to your PRECIOUS, COVETED 400's.
Those motors that you kindly "relieve" them of their THERMOQUADS!! Except that with the
413, things get better, especially around 9.6 - 10.0 to 1. ing isn't it!!