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Old 03-08-2017, 01:39 PM   #1
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292 Pistons

I'm sending my 292 to the machine shop later this week and started looking for new pistons and there are 5 different stock replacement options on Summit alone.
Any opinions/suggestions on the following? Any other pistons that are better?
I want to run 87 so that is why I am looking at stock pistons.
Thanks in advance.

https://www.summitracing.com/parts/u...make/chevrolet
https://www.summitracing.com/parts/s...make/chevrolet
https://www.summitracing.com/parts/u...make/chevrolet
https://www.summitracing.com/parts/u...make/chevrolet
https://www.summitracing.com/parts/u...make/chevrolet
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Old 03-08-2017, 10:09 PM   #2
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Re: 292 Pistons

Quote:
Originally Posted by Classic v6 GMC's View Post
I'm sending my 292 to the machine shop later this week and started looking for new pistons and there are 5 different stock replacement options on Summit alone.
Any opinions/suggestions on the following? Any other pistons that are better?
I want to run 87 so that is why I am looking at stock pistons.
Thanks in advance.

https://www.summitracing.com/parts/u...make/chevrolet
https://www.summitracing.com/parts/s...make/chevrolet
https://www.summitracing.com/parts/u...make/chevrolet
https://www.summitracing.com/parts/u...make/chevrolet
https://www.summitracing.com/parts/u...make/chevrolet
All those pistons are .030 over just to be clear. Few of them have different compression distances. https://www.summitracing.com/parts/u...make/chevrolet

I'd just go with these.
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Old 03-08-2017, 11:53 PM   #3
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Re: 292 Pistons

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Originally Posted by TJ's Chevy View Post
All those pistons are .030 over just to be clear. Few of them have different compression distances. https://www.summitracing.com/parts/u...make/chevrolet

I'd just go with these.
Thanks for the reply!
Yes I was just looking at .030 over because that is a common over bore. I'm going to wait for the machinist to tell me what size is needed.
I saw the different compression distances and dish sizes and that is why I wanted suggestions.
Any reasons for those pistons over the other? Just wondering.

I am building this for my 4x4 so I want to keep the low end torque.
How much would 1.84 or 1.94 intake and 1.6 exhaust valves help?
What about lump ports?
I plan on going with a 4 barrel intake.
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Old 03-09-2017, 03:19 PM   #4
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Re: 292 Pistons

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Originally Posted by Classic v6 GMC's View Post
Thanks for the reply!
Yes I was just looking at .030 over because that is a common over bore. I'm going to wait for the machinist to tell me what size is needed.
I saw the different compression distances and dish sizes and that is why I wanted suggestions.
Any reasons for those pistons over the other? Just wondering.

I am building this for my 4x4 so I want to keep the low end torque.
How much would 1.84 or 1.94 intake and 1.6 exhaust valves help?
What about lump ports?
I plan on going with a 4 barrel intake.
I'm not sure what the stock distance was so I picked the furthest. haha Personally I'd prefer sealed power pistons over those, but you can only get cast aluminum propane pistons from them which would bump your compression to 9.5.1.
With stock compression and a stock cam bigger valves with lump ports won't do a whole lot. 1.84's with lump ports would help for sure, but adding some lift would be the best thing you could do.

Here would be a good cam:
http://www.compcams.com/Company/CC/c...x?csid=58&sb=2

This is a 250 cam so you'd have to have it custom ground on a 292 cam.

4 barrel intake with headers would help to. You'll get better mid range with them.

Really the best thing you could do is bump the compression up for more power, then you would have the low end still. 5-8 pounds of boost would really do it.
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Old 03-09-2017, 06:41 PM   #5
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Re: 292 Pistons

The #1437 would be my choice as well.

How would one deal with different fuel pump eccentric location using that 250 cam? Electric?
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Old 03-09-2017, 07:21 PM   #6
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Re: 292 Pistons

Quote:
Originally Posted by TJ's Chevy View Post
I'm not sure what the stock distance was so I picked the furthest. haha Personally I'd prefer sealed power pistons over those, but you can only get cast aluminum propane pistons from them which would bump your compression to 9.5.1.
With stock compression and a stock cam bigger valves with lump ports won't do a whole lot. 1.84's with lump ports would help for sure, but adding some lift would be the best thing you could do.

Here would be a good cam:
http://www.compcams.com/Company/CC/c...x?csid=58&sb=2

This is a 250 cam so you'd have to have it custom ground on a 292 cam.

4 barrel intake with headers would help to. You'll get better mid range with them.

Really the best thing you could do is bump the compression up for more power, then you would have the low end still. 5-8 pounds of boost would really do it.
Okay I dropped it off at the machine shop and he said we need .040 over pistons.
Can I get .040 over propane pistons? So I would have to run 91?

So if that cam, 1.84 and 1.6 valves, lump ports, 4 barrel and header will make a nice engine then I will do that. Just not sure on pistons.
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Old 03-09-2017, 09:48 PM   #7
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Re: 292 Pistons

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The #1437 would be my choice as well.

How would one deal with different fuel pump eccentric location using that 250 cam? Electric?
You can't use a 250 cam in a 292, that eccentric will hit against something and for the life of me I can't remember, OR it was the fact that you Can, but you won't be able to run a cam driven pump.
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Old 03-09-2017, 10:14 PM   #8
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You can't use a 250 cam in a 292, that eccentric will hit against something and for the life of me I can't remember, OR it was the fact that you Can, but you won't be able to run a cam driven pump.
You are probably thinking of flat spots on the 292 cam for conn rod clearance. That would be chief concern using a 250 cam.
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Old 03-09-2017, 10:16 PM   #9
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Re: 292 Pistons

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Okay I dropped it off at the machine shop and he said we need .040 over pistons.
Can I get .040 over propane pistons? So I would have to run 91?

So if that cam, 1.84 and 1.6 valves, lump ports, 4 barrel and header will make a nice engine then I will do that. Just not sure on pistons.
If it was me I'd go with a .040 over set of Ross pistons...but those will put you out $620. lol

Another issue is the sealed power pistons are only available in a .030 over bore.

If you can't find pistons you can shave the block and head for more compression. I shaved the head on my 292 .030. Block you'd have to be more conservative with. Any particular reason why you have to go .040 over???
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Old 03-09-2017, 10:17 PM   #10
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Re: 292 Pistons

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You are probably thinking of flat spots on the 292 cam for conn rod clearance. That would be chief concern using a 250 cam.
That and I thought there was a reason you couldn't as well due to the position of the eccentric. I'll have to read up on that again.
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Old 03-09-2017, 11:37 PM   #11
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Re: 292 Pistons

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Originally Posted by TJ's Chevy View Post
If it was me I'd go with a .040 over set of Ross pistons...but those will put you out $620. lol

Another issue is the sealed power pistons are only available in a .030 over bore.

If you can't find pistons you can shave the block and head for more compression. I shaved the head on my 292 .030. Block you'd have to be more conservative with. Any particular reason why you have to go .040 over???
I can't spend $620 for a driver build lol

I'm going over there tomorrow so I will ask him if I can get away with .030 over. It has a good cylinder ridge at the top so that is why he was thinking .040 to be safe.
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Old 03-10-2017, 01:41 AM   #12
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Re: 292 Pistons

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I can't spend $620 for a driver build lol

I'm going over there tomorrow so I will ask him if I can get away with .030 over. It has a good cylinder ridge at the top so that is why he was thinking .040 to be safe.
"I can't spend $620 for a driver build lol"

Sure ya can! They are a nice set to, I got them for my 292. You can use them as a mirror to comb yer hair in!

Ah ok, Might just have to go with stockers then. Only two sizes I know of for stock pistons are .030 and .060.
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Old 03-10-2017, 12:00 PM   #13
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Re: 292 Pistons

Sealed power pistons are available in .040 over I ended up with a set Im not going to use, decided to bite the bullet and get the Ross pistons from Tom
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Old 03-10-2017, 01:55 PM   #14
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Re: 292 Pistons

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Sealed power pistons are available in .040 over I ended up with a set Im not going to use, decided to bite the bullet and get the Ross pistons from Tom
The propane or stock style pistons?
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Old 03-10-2017, 02:46 PM   #15
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Re: 292 Pistons

Which lump ports would you suggest?

http://www.ebay.com/itm/HI-FLOW-inta...KVwYcw&vxp=mtr

http://www.ebay.com/itm/T6G1-230-250...hRZ9on&vxp=mtr

http://www.ebay.com/itm/T6G2-Max-Flo...RRXv3F&vxp=mtr
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Last edited by Classic v6 GMC's; 03-11-2017 at 12:16 AM.
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Old 03-11-2017, 12:25 AM   #16
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Re: 292 Pistons

Well .040 over was confirmed by the machine shop so I guess I will go with these https://www.summitracing.com/parts/uem-1437-040
I guess I can always put a turbo on it.
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1966 GMC 3/4 ton Custom PS PB Sport trim 351 v6 th400
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Old 03-11-2017, 01:48 AM   #17
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Re: 292 Pistons

Those 3 are pretty much the same, I'd get the ones in the 2nd link.

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Well .040 over was confirmed by the machine shop so I guess I will go with these https://www.summitracing.com/parts/uem-1437-040
I guess I can always put a turbo on it.
Sounds good, turbo would be good with the stock compression.
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Old 03-16-2017, 10:56 PM   #18
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Re: 292 Pistons

Well I have ordered most of the parts except for the cam and lifters.
Pics of what arrived today.
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Old 03-17-2017, 12:45 AM   #19
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Re: 292 Pistons

Cool!
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Old 03-22-2017, 08:11 PM   #20
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Re: 292 Pistons

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Cool!
Thanks

Today I got the call from the machine shop and he said the head and block were ready for pick up!!
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Old 03-22-2017, 08:16 PM   #21
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Re: 292 Pistons

Pics

Some Stainless Glasspack mufflers also arrived yesterday.
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1960 GMC 1/2 ton Custom- http://67-72chevytrucks.com/vboard/s...d.php?t=703046
1968 GMC 3/4 ton 4x4 Short Bed
1967 C20 Flat Bed Driver Project- http://67-72chevytrucks.com/vboard/s...d.php?t=725966
1962 GMC Flatbed http://67-72chevytrucks.com/vboard/s...=1#post7859242
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Old 03-22-2017, 09:02 PM   #22
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Re: 292 Pistons

This is gonna be sweet! Hope to see some footage soon!
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1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643
1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056
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Old 03-22-2017, 10:13 PM   #23
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Re: 292 Pistons

Quote:
Originally Posted by TJ's Chevy View Post
This is gonna be sweet! Hope to see some footage soon!
I hope so. I will get a video when I get it running good.
I'm watching for a video of yours running.
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1966 Chevy 1/2 ton Custom PS PB A/C BBW 283 v8 3 speed overdrive
1966 GMC Long Step 1/2 ton Custom PS PB 305 v6 Powerglide Thread- http://67-72chevytrucks.com/vboard/s...d.php?t=699959
1966 GMC 3/4 ton Custom PS PB Sport trim 351 v6 th400
1966 GMC 3/4 ton 4x4 Custom PB 305 v6 np435
1960 GMC 1/2 ton Custom- http://67-72chevytrucks.com/vboard/s...d.php?t=703046
1968 GMC 3/4 ton 4x4 Short Bed
1967 C20 Flat Bed Driver Project- http://67-72chevytrucks.com/vboard/s...d.php?t=725966
1962 GMC Flatbed http://67-72chevytrucks.com/vboard/s...=1#post7859242
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Old 03-23-2017, 10:32 PM   #24
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Re: 292 Pistons

The High torque cam and other parts arrived today so I now have most everything to assemble the engine.

Only things left now is to decide on the distributor, plug wires and harmonic balancer.
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1966 Chevy 1/2 ton Custom PS PB A/C BBW 283 v8 3 speed overdrive
1966 GMC Long Step 1/2 ton Custom PS PB 305 v6 Powerglide Thread- http://67-72chevytrucks.com/vboard/s...d.php?t=699959
1966 GMC 3/4 ton Custom PS PB Sport trim 351 v6 th400
1966 GMC 3/4 ton 4x4 Custom PB 305 v6 np435
1960 GMC 1/2 ton Custom- http://67-72chevytrucks.com/vboard/s...d.php?t=703046
1968 GMC 3/4 ton 4x4 Short Bed
1967 C20 Flat Bed Driver Project- http://67-72chevytrucks.com/vboard/s...d.php?t=725966
1962 GMC Flatbed http://67-72chevytrucks.com/vboard/s...=1#post7859242

Last edited by Classic v6 GMC's; 03-23-2017 at 10:41 PM.
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Old 03-24-2017, 01:04 AM   #25
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Re: 292 Pistons

For the harmonic balancer I went with this:
https://www.summitracing.com/parts/r...make/chevrolet


For the distributor I went with this:

https://www.summitracing.com/parts/d...make/chevrolet

The DUI is expensive....but made here in America.

Here's an alternative on Ebay(It comes with wires):
http://www.ebay.com/itm/CHEVY-Inline...RXtR~4&vxp=mtr

Or you could just get a set of Napa Premium HEI wires for a 70's 292. They are a nice set and are 8 mm.
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"6 in a row makes it go!"
"I prefer a buzzin half-dozen"
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643
1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056
My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw
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