piston imfo need product brand

frank3ks · 03-07-2008, 05:12 AM

I have a piston that went bad in a 400 small block was wondering if anyone new what brand it is as i would like to match it exact, it is a standard bore 400 small block flat top with 4 releifs in top ,number on top of piston is H400P STD ON THE SIDE OF PISTON IS H400 any help would be appreciated thankx frank3ks it is a forged piston

mudseeker · 03-07-2008, 09:56 AM

any parts store could probably get you an OEM part, but since you have it tore down, i would replace them all and have the cylinders honed. you will have to hone the one cylinder anyway for the new rings when you replace the bad piston.

75K30 · 03-07-2008, 10:25 AM

Another fine suggestion mudseeker.
It does not make much sense to take the engine all the way down, and replace just one piston.
What was the reason it went bad? Did a valve hit it? Did it get hot and crack? Did it detonate and get torn up, or maybe a foreign object was introduced into the engine and found one cylinder?
Either way, all of the pistons are subject to the same potential damage and all have an equal amount of wear and tear. THis means that unless you can absolutly guarantee that damage was limited to one cylinder. Even then, you have to consider that you will still have to hone (at minimum) the cylinder with the replacement piston. This is pretty impossible without contaminating the rest of the engine. You do not want those metal, and abrasive particles sitting around since you will have no way to properly clean up.
I know it is not what you wanna hear, but now will bw a good time to remove all of the suspect pistons, and replace them.
THe good news, is that you will have a fresh engine, and you can pick up some real performance with a few changes.
For example: a set of 2 valve relief pistons will have a slightly higher compression ratio than a set with 4 reliefs, and promote better flame travel, thus providing better power. THe same is true for a larger bore. You will also get a slightly better (dynamic, and static) compression ratio, and the increase in cubic inches (while minimal) will also equal more power. A slightly more aggressive cam will really let this engine work well.
AT any rate, I believe you need to seek some additional advice on re-building the entire engine. It is the right thing to do.

frank3ks · 03-08-2008, 01:24 AM

I Guess No One Can Answer My Question Im Not An Idiot On Motors Motor Is Completely Dissasembled Already Magnafluxed And Honed ,pistons Were10.3 Compresion One Came Loose Due Too A Wrist Pin Pressed Wrong Motor Has Less Than 1000 Miles On It Pistons Are New Forged ,motor Was Built By A Guy Who Built Proffesionally But Moved Just Wanted To Know If Anyone Knew How Too Match The Numbers Thankx Frankd

Hayden · 03-08-2008, 06:48 AM

No. Noone can answer your question because many manufuctures make that # of piston. Its a standard Flat top hypereutectic piston for a 400 SB

Heres a link for TRW Pistons
Flatlander Racing - TRW Chevy Pistons

heres a link for Speed Pro Pistons
Speed-Pro

frank3ks · 03-09-2008, 06:05 AM

Thankx hayden i appreciate your help. frank3ks

03-07-2008, 05:12 AM	#1
frank3ks Full Member Join Date: Mar 2007 Posts: 27	piston imfo need product brand I have a piston that went bad in a 400 small block was wondering if anyone new what brand it is as i would like to match it exact, it is a standard bore 400 small block flat top with 4 releifs in top ,number on top of piston is H400P STD ON THE SIDE OF PISTON IS H400 any help would be appreciated thankx frank3ks it is a forged piston

03-07-2008, 09:56 AM	#2
mudseeker mod-o-tator Join Date: Feb 2006 Location: michigan Posts: 4,494	any parts store could probably get you an OEM part, but since you have it tore down, i would replace them all and have the cylinders honed. you will have to hone the one cylinder anyway for the new rings when you replace the bad piston. __________________ member map add yourself alldatadiy why is it, when i push one for english, i still can't understand the person on the other end?

03-08-2008, 01:24 AM	#4
frank3ks Full Member Join Date: Mar 2007 Posts: 27	reply I Guess No One Can Answer My Question Im Not An Idiot On Motors Motor Is Completely Dissasembled Already Magnafluxed And Honed ,pistons Were10.3 Compresion One Came Loose Due Too A Wrist Pin Pressed Wrong Motor Has Less Than 1000 Miles On It Pistons Are New Forged ,motor Was Built By A Guy Who Built Proffesionally But Moved Just Wanted To Know If Anyone Knew How Too Match The Numbers Thankx Frankd

03-08-2008, 06:48 AM	#5
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 365	No. Noone can answer your question because many manufuctures make that # of piston. Its a standard Flat top hypereutectic piston for a 400 SB Heres a link for TRW Pistons Flatlander Racing - TRW Chevy Pistons heres a link for Speed Pro Pistons Speed-Pro __________________ There Is No Replacement For Displacement

03-09-2008, 06:05 AM	#6
frank3ks Full Member Join Date: Mar 2007 Posts: 27	thankx Thankx hayden i appreciate your help. frank3ks

03-07-2008, 10:25 AM	#3
75K30 Senior Member Join Date: Jul 2006 Posts: 2,627	Another fine suggestion mudseeker. It does not make much sense to take the engine all the way down, and replace just one piston. What was the reason it went bad? Did a valve hit it? Did it get hot and crack? Did it detonate and get torn up, or maybe a foreign object was introduced into the engine and found one cylinder? Either way, all of the pistons are subject to the same potential damage and all have an equal amount of wear and tear. THis means that unless you can absolutly guarantee that damage was limited to one cylinder. Even then, you have to consider that you will still have to hone (at minimum) the cylinder with the replacement piston. This is pretty impossible without contaminating the rest of the engine. You do not want those metal, and abrasive particles sitting around since you will have no way to properly clean up. I know it is not what you wanna hear, but now will bw a good time to remove all of the suspect pistons, and replace them. THe good news, is that you will have a fresh engine, and you can pick up some real performance with a few changes. For example: a set of 2 valve relief pistons will have a slightly higher compression ratio than a set with 4 reliefs, and promote better flame travel, thus providing better power. THe same is true for a larger bore. You will also get a slightly better (dynamic, and static) compression ratio, and the increase in cubic inches (while minimal) will also equal more power. A slightly more aggressive cam will really let this engine work well. AT any rate, I believe you need to seek some additional advice on re-building the entire engine. It is the right thing to do.

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