Please help me pick a cam, intake, and carb- 383 Stroker - Page 6 - Hot Rod Forum : Hotrodders Bulletin Board
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  #76 (permalink)  
Old 05-22-2013, 07:07 PM
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Tech, that's great stuff right there. Thank you! So, it's obvious that the pistons I currently have wont be doing the trick for this application. Is there a specific piston that you would recommend? I am open to any brands that are of good quality that meet our criteria.

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  #77 (permalink)  
Old 05-22-2013, 08:55 PM
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If properly built 11:1 will be done on 91 octane, but I wouldn't trust a carb on it, they fall out of tune too easily.

You can run those pistons with no problem or just knock a hair off them if you really want 10.5:1. This isn't rocket science.

People sure get in a hurry to spend money around here.

I also don't see why you don't have the PC heads checked before you make any decision. It's very possible you could run the heads and the pistons with only some machine work.

But if money is flowing there's nothing wrong with AFRs either.
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  #78 (permalink)  
Old 05-22-2013, 09:17 PM
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Originally Posted by ap72 View Post
If properly built 11:1 will be done on 91 octane, but I wouldn't trust a carb on it, they fall out of tune too easily.

You can run those pistons with no problem or just knock a hair off them if you really want 10.5:1. This isn't rocket science.

People sure get in a hurry to spend money around here.

I also don't see why you don't have the PC heads checked before you make any decision. It's very possible you could run the heads and the pistons with only some machine work.

But if money is flowing there's nothing wrong with AFRs either.

I understand what you mean! But I unloaded those heads to my brother who has plans for them on a little 350 project he has coming up, so that made my decision a little easier. I definitely don't want to spend more than is necessary, but I would like to have this engine done right the first time.


This piston stuff is all new to me and a bit confusing, so that's why I was hoping I could get a recommendation on a good one too go with that would meet my needs and get the CR I'm shooting for.

Caleb
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Old 05-22-2013, 09:46 PM
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You'll need to find out what length rod is in the motor. 5.7" rods used a piston with a ~1.425" compression height piston. 6.0" rods used a ~1.125" compression height piston.
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Old 05-22-2013, 10:04 PM
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Originally Posted by techinspector1 View Post
You'll need to find out what length rod is in the motor. 5.7" rods used a piston with a ~1.425" compression height piston. 6.0" rods used a ~1.125" compression height piston.
I believe they are 6.0", but I will verify that ASAP.

Caleb
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Old 05-23-2013, 03:45 PM
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They are definitely 6" rods.:thumbup


So, would these fit the bill?

http://www.jepistons.com/Products/140350.aspx

Last edited by Sixshooter45; 05-23-2013 at 03:52 PM.
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Old 05-23-2013, 08:09 PM
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Originally Posted by Sixshooter45 View Post
They are definitely 6" rods.:thumbup
So, would these fit the bill?
140350 Product Detail Information - JE Pistons
No, those are +7cc's pop-ups, same as you have now.

You will want a -4cc to -7cc piston. I don't know if you want to stay with forged or back off a little to a hypereutectic piston. If I were in charge of spending your money and trying to look for max value for the money , I'd probably choose a forging something like this....They may be a closeout because of the low price. The low price may be because of the ring thickness. Most builders nowadays will opt for the thinner (and therefore lighter) 1/16" rings to help prevent ring flutter at high rpm's. I see nothing wrong with using 5/64" rings in a motor that will be rpm limited to ~6000.
http://www.summitracing.com/parts/pb...make/chevrolet

If you wanted to stay with SRP forged, this might be a choice....
http://www.summitracing.com/parts/sr...make/chevrolet

Last edited by techinspector1; 05-23-2013 at 08:21 PM.
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  #83 (permalink)  
Old 05-23-2013, 08:18 PM
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Originally Posted by techinspector1 View Post
No, those are +7cc's pop-ups, same as you have now.

You will want a -4cc to -7cc piston. I don't know if you want to stay with forged or back off a little to a hypereutectic piston. If I were in charge of spending your money and trying to look for max value for the money , I'd probably choose a forging something like this....
http://www.summitracing.com/parts/pb...make/chevrolet

If you wanted to stay with SRP forged, this might be a choice....
http://www.summitracing.com/parts/sr...make/chevrolet



I don't know how I screwed that up, I meant to link to the same 138095 flattops that you linked too and not the domes! I will take a look at the others as well, and do more research to see if forged would be worth the money or not.

I noticed those pistons on Summit say +5, while the same part number on SRP's site says -5. What gives here, misprint on Summits side??

Many thanks Tech!

Caleb

Last edited by Sixshooter45; 05-23-2013 at 08:26 PM.
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Old 05-23-2013, 08:52 PM
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Quote:
Originally Posted by Sixshooter45 View Post
I don't know how I screwed that up, I meant to link to the same 138095 flattops that you linked too and not the domes! I will take a look at the others as well, and do more research to see if forged would be worth the money or not.

I noticed those pistons on Summit say +5, while the same part number on SRP's site says -5. What gives here, misprint on Summits side??

Many thanks Tech!

Caleb
No miss print, summit lists their dish as positive
For example if you use their compression calc in the effective dome field a dish will have a + beside it.
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  #85 (permalink)  
Old 05-23-2013, 08:56 PM
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Ok I follow now. Thanks for the clarification!

Last edited by Sixshooter45; 05-23-2013 at 09:05 PM.
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