#1  
Old 09-29-2022, 02:15 AM
ramair_bryan ramair_bryan is offline
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Default 400 RA3 .060 make into a 455. What do I need?

Dropped a valve in #4.
Sleaved the cylinder, blocks back to normal bored .060.
(4.180)
Can't find summits ''sealed power'' forged piston for the life of me.
(just need one).
Heck, I may as well turn this into a 455 if I have to buy 8 avalible pistons.

Tell us how you built yours........................

  #2  
Old 09-29-2022, 02:47 AM
Dragncar Dragncar is offline
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I have 8 used pistons you need. 75 $ .060 400 TRW pistons.
To make it into a 455 you need a stroker kit.

http://www.krepower.com/Pontiac%20Rotating%20Kits.htm

https://butlerperformance.com/c-1459...ssemblies.html

Go with a Scat forged crank. You won't have to have it re ground.


Last edited by Dragncar; 09-29-2022 at 02:54 AM.
  #3  
Old 09-29-2022, 06:11 AM
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25stevem 25stevem is offline
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The part number you need on the Summit site is L-2262f 060.

They are not back in stock until Oct 30.

Your very lucky to have been able to save that block if it in deed is the correct code for a RA3 motor!

I would do everything I could during this rebuild to not have the same failure this time around take place.

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Old 09-29-2022, 02:59 PM
ramair_bryan ramair_bryan is offline
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Quote:
Originally Posted by Dragncar View Post
I have 8 used pistons you need. 75 $ .060 400 TRW pistons.
To make it into a 455 you need a stroker kit.

http://www.krepower.com/Pontiac%20Rotating%20Kits.htm

https://butlerperformance.com/c-1459...ssemblies.html

Go with a Scat forged crank. You won't have to have it re ground.
0oooooo.....Thats a deal brutha. paypal good?......to merced co california.
How were the fires this year? We did a lot better this year than all the others.

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Old 09-30-2022, 02:58 PM
Dragncar Dragncar is offline
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Quote:
Originally Posted by ramair_bryan View Post
0oooooo.....Thats a deal brutha. paypal good?......to merced co california.
How were the fires this year? We did a lot better this year than all the others.
Paypal would work. Pistons I have are LF 2262.
Fires ? I live about a mile and a half from the ocean so big fires are not happening around here. Having a fair share of folks moving up here after their homes burned down inland or they are sick of the overbearing heat. If we want heat we just drive 20 miles inland, plenty of rivers up here to go swimming.
Fire season is not over, plenty have happened in October, be safe.
PM me your info on the pistons.

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Old 10-02-2022, 01:12 AM
ramair_bryan ramair_bryan is offline
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Stand by....we're talking compression ratios on the other thread.
(didn't take that into account).

Hold those killer pistons for me.
Back shortly...............

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Old 10-04-2022, 03:03 PM
ramair_bryan ramair_bryan is offline
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Who here has stacked 2 head gaskets to lower compression?

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Old 10-04-2022, 03:06 PM
74Grandville 74Grandville is offline
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Quote:
Originally Posted by ramair_bryan View Post
Who here has stacked 2 head gaskets to lower compression?
not a good idea.

carb tune, distributor tune and make sure the engine is running cool are your best options. might want to consider cam choice as well.

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Old 10-04-2022, 11:43 PM
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Quote:
Originally Posted by ramair_bryan View Post
Who here has stacked 2 head gaskets to lower compression?
That’s not a good idea but if you were to use gaskets to lower compression you’d use cometics . But at that point your better off just buying DSS dished pistons. Mostly because .060 w flat tops really kinda ups the compression. A Dss is made a 14 cc dish but because they are made to order he can do more if you ask .they are about $650 though which isn’t bad for a new dished pistons made to order .
Cometics can cost pretty good $$ especially the thicker versions

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  #10  
Old 10-05-2022, 11:28 PM
ramair_bryan ramair_bryan is offline
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School me on crank/block again, using the 455 crank in our 400 .

Machine shop said he'd have to reduce the rear main seals surface
as well as the mains.

Doesn't have the $700 stone (skinny stone) that'll fit the seals surface.
Told him that stones likely $1400 bucks now.....................

Not as simple as I thought. Glad I hadn't spent any cash yet.
So, what to do with this wad of cash before the wife notices..................

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Old 10-05-2022, 11:48 PM
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Quote:
Originally Posted by ramair_bryan View Post
School me on crank/block again, using the 455 crank in our 400 .

Machine shop said he'd have to reduce the rear main seals surface
as well as the mains.

Doesn't have the $700 stone (skinny stone) that'll fit the seals surface.
Told him that stones likely $1400 bucks now.....................

Not as simple as I thought. Glad I hadn't spent any cash yet.
So, what to do with this wad of cash before the wife notices..................
I think he’s talking about dropping a 455 crank in a 400.
But if you buy an after market stroker assembly it’s a drop in deal other than clearancing one little spot on the block. These are usually zero balance though so you need a zero balance fly wheel and balancers as well .
I’m torn with what I’m doing on one of my engines also keeping what I have for rotating assembly or spending the money and going stroker set up.

One thing I dint like about most of the stroker set ups is they are chevy rod length. 6.8 and I like the 6.625 rod because it Pontiac. The long rod has better dwell at TDC. But it’s still chevy **** in my Pontiac. ��

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  #12  
Old 10-06-2022, 12:02 AM
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Quote:
Originally Posted by turbo69bird View Post
One thing I dint like about most of the stroker set ups is they are chevy rod length. 6.8 and I like the 6.625 rod because it Pontiac. The long rod has better dwell at TDC. But it’s still chevy **** in my Pontiac. ��
What Chevy engine uses a 6.8 rod?

Typical BBC is 6.135. Chevy had a 6.405 rod as a "race" item once upon a time; and they were quickly discontinued.

More likely, the aftermarket cranks are set up for Chevy journal diameter and width.

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Old 10-09-2022, 11:06 PM
ramair_bryan ramair_bryan is offline
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Hike n mike donated 2 (two) 455 cranks at .020 under.
Hate to disappoint the guy.

Something i learned sat. King bearing and other manufacturers make .030 and .040 under sized bearings now (or have for a long time) for our cranks.

Boy.....back in the day, if yours was at .020 your crank was all done.

Back to the stroker build up, Any other Ideas using one of the cranks in our 400?

You guys are the best................

  #14  
Old 10-09-2022, 11:20 PM
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I have done a couple of these.Look into a Ohio crank 3in main rotating assembly.Getting a free 3 1/4 main cast crank still needs machine work to cut it down and cheapest is to also cut the Js to BBC because of so many rod choices.You will need to use a thrust bearing spacer with the 3 1/4 crank also.The one I’m doing now I will use 6.7 rods.Tom

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Old 10-09-2022, 11:23 PM
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$2475 complete forged Sam,bearings etc balanced etc.Tom

  #16  
Old 10-10-2022, 12:11 PM
ramair_bryan ramair_bryan is offline
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I guess, since I was going to end up buying 8 pistons instead of one (dealers won't split up the set) I may as well buy 455 pistons and have the crank turned.

Not simple .
Not cost effective as I thought.

Have to keep it a 400. Unless you can talk the shop into grinding it.
I haven't given up. Hoping you guys have another way to make this crank work. But I think What's said is all there is for this, at this moment.

Old timers....back in the day started stroking these before you could buy scat's
That time seems to have past.

Heck.....we're down to one machine shop in town too...............

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