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Old 03-07-2008, 04:26 PM   #1
DeucePhaeton
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Default Tech: 348 - 409

I did this back in the early 80s when I rebuilt the ole 348 for the Impala. As the "W" motor fans know the deck angle to the cylinder bore for these engines isn't perpendicular to one another. So how does one install the pistons into the cylinders after a rebuild? >A< You can run down to your favorite AZ and purchase a 348/409 piston ring compressor. Ya, sure.. >B< Get a few of your favorite buddies over for a install party with a half dozen flat blade screw drivers. I don't recomend this! >C< Try it by yourself with the kids outta shouting range. Or >D< Takes a little preplannning but I used a piece of black pipe and bored it on a lathe to a couple of thousands under my finished bore diameter. Squared up one side to the bore and milled the other to the proper 17 degree angle of the deck. Use a standard piston ring compressor on the square side. Worked like a champ.
I'm sure there are other ways but it's how I skinned the cat.
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Old 03-07-2008, 04:27 PM   #2
CURIOUS RASH
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Default Re: Tech: 348 - 409

How much for it?

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Old 03-07-2008, 04:41 PM   #3
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Default Re: Tech: 348 - 409

Saves breaking rings ?
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Old 03-07-2008, 08:12 PM   #4
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Default Re: Tech: 348 - 409

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Originally Posted by CURIOUS RASH View Post
How much for it?
I was thinking the same thing, that or, how much to rent it for a little while??

Nice...
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Old 03-07-2008, 08:47 PM   #5
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Default Re: Tech: 348 - 409

Me too!
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Old 03-07-2008, 08:54 PM   #6
DeucePhaeton
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Default Re: Tech: 348 - 409

This is for a +.060" 348. So it's 4.183" or so.
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Old 03-08-2008, 07:31 AM   #7
modifieddriver
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Default Re: Tech: 348 - 409

Hell, I need it too. I'm doing a 348 +.060.

I promise I'll return it. I've been dodging this job for awhile just because of the ring compressor issue.

Rental fee? Deposit ....... I'll give ya' the title to my '40 Ford Pickup!!!!
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Old 03-08-2008, 11:34 AM   #8
Larry T
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Default Re: Tech: 348 - 409

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Originally Posted by modifieddriver View Post
Hell, I need it too. I'm doing a 348 +.060.

I promise I'll return it. I've been dodging this job for awhile just because of the ring compressor issue.

Rental fee? Deposit ....... I'll give ya' the title to my '40 Ford Pickup!!!!
I didn't know it was that hard to install pistons in a 348/409 without a ring squeezer. I've had good luck just squeezing the rings as they go into the cylinder. The further they go into the cylinder the further around you squeeze them until they're all the way in, if that makes any sense.
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Old 11-22-2011, 02:12 PM   #9
DeucePhaeton
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Default Re: Tech: 348 - 409

Dragging up old threads....
How'd this work out for people? Did anybody have one made? What did it cost?
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Old 11-22-2011, 02:14 PM   #10
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Default Re: Tech: 348 - 409

What bore size is that one....Ive got a use for it..Lol
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Old 11-22-2011, 02:31 PM   #11
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Default Re: Tech: 348 - 409

Nice item.
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Old 11-22-2011, 02:35 PM   #12
DeucePhaeton
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Default Re: Tech: 348 - 409

I figured you had the resources to make your own.
I can loan it to you when I send your T-shirts ----
Answer to the question is, I built it for installing my 348 +.060 Pistons way back in 82. I installed used Jahns that measured out to be +.058" with wear and IF I remember right it was bored -002" from that dimension. I just used it to install my new Egge pistons which are an honest +.060" is it still works.
Brian
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Last edited by DeucePhaeton; 11-23-2011 at 08:38 AM.
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Old 11-22-2011, 02:53 PM   #13
Truckedup
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Default Re: Tech: 348 - 409

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Old 11-22-2011, 02:57 PM   #14
48 Chubby
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Default Re: Tech: 348 - 409

When a 348/409 is bored it should also be counterbored. If the bore goes .060 over then the combustion chamber (it's in the block) also goes .060 over. Then you can use a standard band type ring compresser seated at the bottom of the counterbore. Beyond where the ring squeezer sits, its just like any other engine. I've built a few of these, no problem.
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Old 11-22-2011, 03:25 PM   #15
56don
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Default Re: Tech: 348 - 409

I was expecting to have trouble putting my pistons in because of all the stories I heard about the W motor being hard to install pistons/rings. But I had no trouble at all. Mine was bored .030 and I used a standard ring compressor. I had no problem.
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Old 11-22-2011, 05:43 PM   #16
DeucePhaeton
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Default Re: Tech: 348 - 409

Quote:
Originally Posted by 48 Chubby View Post
When a 348/409 is bored it should also be counterbored. If the bore goes .060 over then the combustion chamber (it's in the block) also goes .060 over. Then you can use a standard band type ring compresser seated at the bottom of the counterbore. Beyond where the ring squeezer sits, its just like any other engine. I've built a few of these, no problem.
Since the combustion chamber is determined by the pistons and it cylinder, how much does this lower the compression? Probably not much but have you done the math? How deep (dia) is the counter bore?
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