forged or hyper - The 1947 - Present Chevrolet & GMC Truck Message Board Network

POPO1984 · 05-03-2010, 03:48 PM

guys im building a 383. my engine guy seems like he wants me to use forged pistons. the ones he wants will put me around 9.5:1 cr and are 450 bucks. do i really need forged or could i go hyper. i dont plan on spraying it or FI

swb85 · 05-03-2010, 05:20 PM

If no power adders are planned, hyper is just fine. In all reality, you can even put a light power adder (100 shot or ~5lbs of boost) to quality hyper pistons so long as the tune is in order.

*Ticker* · 05-03-2010, 06:48 PM

The one thing to keep in mind that it's relatively cheap now to go forged...but hella expensive later (new pistons, rebalance, etc.)

If you think in your wildest dreams that you might user a power-adder later...spend the $$ now.

rjs53 · 05-03-2010, 08:11 PM

It wouldn't bother me to go hyper if no power adders. I had a ZZ4 that i angled milled the heads .020 put the comp hr282 cam in and 1.6 rockers drove it like i stole it and had close to 200 1/4 mile passes on it. always ran 91 or 110 in it the one time i put 87 in it it rattled but didn't hurt it. wish i still had that motor but that's how wheelin and dealin goes

Alex1 · 05-03-2010, 08:27 PM

Forged.

Marv D · 05-03-2010, 08:41 PM

No way would I build ANY performance or even a towing engine with hypereutectic pistons. Add a little detonation and they turn back to the sand whence they came. I have opened up more than one broken motor and found a hypereutectic piston GONE, no evidence at all it ever existed. Well,, except the big gaping hole in the cylinder wall where the rod beat the crap out of it with no piston to guide it's path.
Hypers are great for a driver / cruiser. Little thermal expansion means they have a tighter bore cold, are quiet as cast, great oil control, no scuffing if the motor overheats. They have their good points. but they also have their down side.

*Ticker* · 05-03-2010, 08:45 PM

I've built a bunch of hypereutectic engines - some that were pretty warm - and the only time I've seen 'em break is when more than a 75-100 shot of NOS is used, or when using Keith Black pistons without paying proper attention to ring gap.

NO engine is going to survive sustained detonation at speed...

ProStreet68SB · 05-03-2010, 09:33 PM

Quote:

Originally Posted by swb85

If no power adders are planned, hyper is just fine. In all reality, you can even put a light power adder (100 shot or ~5lbs of boost) to quality hyper pistons so long as the tune is in order.

hypers can handle boost, just not spray. Remember the old GMC syclones and typhoons? I wanna say it was 11 or 13lbs from the factory on hypereutectic pistons. I know a guy here in cbus is a 5.0 mustang running hypers and 10lbs i wanna say he makes 435whp. So hypers can take boost, just not spray.

hotrod 80 · 05-03-2010, 09:47 PM

Forged or cast for me .

POPO1984 · 05-03-2010, 09:56 PM

Okay I got the forged srp 18cc dished pistons for $ 450.00 out the door. I plan on running 72 cf heads which should put me around 9.1:1. This is with a 6.0 rod. At least this is what my engine guy is telling me.

fiddy9apache · 05-03-2010, 11:21 PM

forged, spend the extra money now.

*Ticker* · 05-03-2010, 11:39 PM

Quote:

Originally Posted by POPO1984

Okay I got the forged srp 18cc dished pistons for $ 450.00 out the door. I plan on running 72 cf heads which should put me around 9.1:1. This is with a 6.0 rod. At least this is what my engine guy is telling me.

Tough decision - but a good one. I personally like SRP and buy their pro kits for my builds almost exclusively.

I'm sure the engine guy has "done the math" and done it right...but ask him to lay the whole thing out for you - deck height, head gaset, quench, etc. You'll want that stuff later for sure. Generally you want to collect EVERYTHING you can and put it in a "build book", which is the "bible" (<- not capitalized, so everyone relax

) for your engine. P/N, clearances, etc...get it all.

BossHogg69 · 05-04-2010, 12:45 AM

Good call on the SRP's - I have a set of forged 23cc dome forged SRP's in my 468.

Hertzdaddy · 05-04-2010, 08:06 AM

Quote:

Originally Posted by Ticker

I'm sure the engine guy has "done the math" and done it right...but ask him to lay the whole thing out for you - deck height, head gaset, quench, etc. You'll want that stuff later for sure. Generally you want to collect EVERYTHING you can and put it in a "build book", which is the "bible" (<- not capitalized, so everyone relax

) for your engine. P/N, clearances, etc...get it all.

Very good advice. I wish I had that info now on an engine I bought already assembled.

djracer · 05-04-2010, 08:44 AM

You made the right decision so now order that plate system to get that pig out of the hole! LOL

POPO1984 · 05-04-2010, 09:10 AM

Quote:

Originally Posted by djracer

You made the right decision so now order that plate system to get that pig out of the hole! LOL

That was one of the reasons that I got the forged. If I want to spray it way later down the road ill be able to.

swb85 · 05-04-2010, 10:51 AM

Quote:

Originally Posted by ProStreet68SB

hypers can handle boost, just not spray.

Tell that to all the ls1 cars that have a 150+ shot on them. Shoot there's some local guys around here that have been spraying 200 for several years on stock bottom ends.....they won't last forever, but if you keep it from detonating it won't grenade.

J_PEPIN87 · 05-04-2010, 10:52 AM

Who's building your engine popo?

hotrod 80 · 05-04-2010, 11:53 AM

Quote:

Originally Posted by j_pepin87

who's building your engine popo?

x 2

POPO1984 · 05-04-2010, 01:10 PM

This older guy in South Houston his buisness is called speeco. Ive heard really good things about him. Really nice guy he is also doing my rebuild on the differential. His name is Harold or Buddy

*Ticker* · 05-04-2010, 01:29 PM

Quote:

Originally Posted by swb85

Tell that to all the ls1 cars that have a 150+ shot on them. Shoot there's some local guys around here that have been spraying 200 for several years on stock bottom ends.....they won't last forever, but if you keep it from detonating it won't grenade.

I have seen hypereutectics hold up under some brutal abuse...but in the end it becomes a risk management process

djracer · 05-04-2010, 02:32 PM

If my memory serves me right someone on here had a 305 with a bunch of spray and I think it had cast or hypers in it but I wouldn't try it. I always say I would rather be lucky than good. That guy was lucky.

Shon · 05-04-2010, 04:34 PM

local 135k mile STOCK Bottom end LT1 is running in the 9s (1/4 mile) on the hose so if you got the tune right, it will work....

hotrod 80 · 05-04-2010, 06:08 PM

Quote:

Originally Posted by Ticker

I have seen hypereutectics hold up under some brutal abuse...but in the end it becomes a risk management process

Quote:

Originally Posted by Shon

local 135k mile STOCK Bottom end LT1 is running in the 9s (1/4 mile) on the hose so if you got the tune right, it will work....

If these are the Mahle pistons they will take quit a bit of abuse if the tune is right , but The popular name brand that first comes to mind you couldn't give me .

**Captainfab** · 05-04-2010, 11:12 PM

So the Mahle hypers are supposed to be better than the other brand? Can you elaborate?

Quote:

Originally Posted by hotrod 80

If these are the Mahle pistons they will take quit a bit of abuse if the tune is right , but The popular name brand that first comes to mind you couldn't give me .

05-03-2010, 03:48 PM	#1
POPO1984 Registered User Join Date: Jul 2009 Location: Houston, Tx Posts: 1,133	forged or hyper guys im building a 383. my engine guy seems like he wants me to use forged pistons. the ones he wants will put me around 9.5:1 cr and are 450 bucks. do i really need forged or could i go hyper. i dont plan on spraying it or FI __________________ 1972 SWB Medium Olive South Houston Instagram: Antbish84

05-03-2010, 05:20 PM	#2
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: forged or hyper If no power adders are planned, hyper is just fine. In all reality, you can even put a light power adder (100 shot or ~5lbs of boost) to quality hyper pistons so long as the tune is in order. __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD

05-03-2010, 06:48 PM	#3
Ticker Account Suspended Join Date: Oct 2009 Location: Sammamish, WA Posts: 2,404	Re: forged or hyper The one thing to keep in mind that it's relatively cheap now to go forged...but hella expensive later (new pistons, rebalance, etc.) If you think in your wildest dreams that you might user a power-adder later...spend the $$ now.

05-03-2010, 08:11 PM	#4
rjs53 Registered User Join Date: Jan 2010 Location: nevada Posts: 649	Re: forged or hyper It wouldn't bother me to go hyper if no power adders. I had a ZZ4 that i angled milled the heads .020 put the comp hr282 cam in and 1.6 rockers drove it like i stole it and had close to 200 1/4 mile passes on it. always ran 91 or 110 in it the one time i put 87 in it it rattled but didn't hurt it. wish i still had that motor but that's how wheelin and dealin goes __________________ 2003 Dodge 2500 1969 C10 2014 Camaro SS/RS/1LE

05-03-2010, 08:27 PM	#5
Alex1 Registered User Join Date: Jul 2007 Location: Ottawa Ontario Canada Posts: 1,156	Re: forged or hyper Forged.

05-03-2010, 08:41 PM	#6
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: forged or hyper No way would I build ANY performance or even a towing engine with hypereutectic pistons. Add a little detonation and they turn back to the sand whence they came. I have opened up more than one broken motor and found a hypereutectic piston GONE, no evidence at all it ever existed. Well,, except the big gaping hole in the cylinder wall where the rod beat the crap out of it with no piston to guide it's path. Hypers are great for a driver / cruiser. Little thermal expansion means they have a tighter bore cold, are quiet as cast, great oil control, no scuffing if the motor overheats. They have their good points. but they also have their down side. __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

05-03-2010, 08:45 PM	#7
Ticker Account Suspended Join Date: Oct 2009 Location: Sammamish, WA Posts: 2,404	Re: forged or hyper I've built a bunch of hypereutectic engines - some that were pretty warm - and the only time I've seen 'em break is when more than a 75-100 shot of NOS is used, or when using Keith Black pistons without paying proper attention to ring gap. NO engine is going to survive sustained detonation at speed...

05-03-2010, 09:47 PM	#9
hotrod 80 mini truck racer Join Date: Aug 2006 Location: Baytown , texas Posts: 3,010	Re: forged or hyper Forged or cast for me . __________________ 1949 5-window 1969 Camaro 1976 Chevy Luv yellow 1978 Chevy Luv Blue 1976 Chevy Luv Black 1979 Firebird Flooded in Harvey 1999 F350 Dually 2005 GMC Sierra 4.8 RCSB 2014 Explorer (wifes) My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148 Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583

05-03-2010, 09:56 PM	#10
POPO1984 Registered User Join Date: Jul 2009 Location: Houston, Tx Posts: 1,133	Re: forged or hyper Okay I got the forged srp 18cc dished pistons for $ 450.00 out the door. I plan on running 72 cf heads which should put me around 9.1:1. This is with a 6.0 rod. At least this is what my engine guy is telling me. __________________ 1972 SWB Medium Olive South Houston Instagram: Antbish84 Last edited by POPO1984; 05-03-2010 at 10:07 PM.

05-03-2010, 11:21 PM	#11
fiddy9apache Registered User Join Date: Aug 2009 Location: ftw tex Posts: 682	Re: forged or hyper forged, spend the extra money now.

05-04-2010, 12:45 AM	#13
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: forged or hyper Good call on the SRP's - I have a set of forged 23cc dome forged SRP's in my 468. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!!

05-04-2010, 08:44 AM	#15
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,892	Re: forged or hyper You made the right decision so now order that plate system to get that pig out of the hole! LOL __________________ Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!

05-04-2010, 10:52 AM	#18
J_PEPIN87 Registered User Join Date: Sep 2008 Location: PASADENA,TX Posts: 206	Re: forged or hyper Who's building your engine popo?

05-04-2010, 01:10 PM	#20
POPO1984 Registered User Join Date: Jul 2009 Location: Houston, Tx Posts: 1,133	Re: forged or hyper This older guy in South Houston his buisness is called speeco. Ive heard really good things about him. Really nice guy he is also doing my rebuild on the differential. His name is Harold or Buddy __________________ 1972 SWB Medium Olive South Houston Instagram: Antbish84 Last edited by POPO1984; 05-04-2010 at 01:10 PM.

05-04-2010, 02:32 PM	#22
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,892	Re: forged or hyper If my memory serves me right someone on here had a 305 with a bunch of spray and I think it had cast or hypers in it but I wouldn't try it. I always say I would rather be lucky than good. That guy was lucky. __________________ Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!



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05-04-2010, 04:34 PM	#23
Shon Registered User Join Date: Sep 2005 Location: sc Posts: 1,203	Re: forged or hyper local 135k mile STOCK Bottom end LT1 is running in the 9s (1/4 mile) on the hose so if you got the tune right, it will work.... __________________ 71 Cheyenne C10 LWB cam'd 6.0/T56 Swap

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