Need some advice - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**americanmusc1e** · 02-12-2009, 04:20 PM

I have a '70 long fleet with a brand new (3000 miles) 350 (.060 over) it has home-ported vortec heads, a HE260 cam, 1.6 stamped roller rockers, headers, a weiand stealth intake and a 600 vacumn secondary..... the motor has dished hyperecutec pistons, stock rods, four bolt mains, 9:1 compression and a cast crank......... the truck has a th-350 and 3.08 open diff which i am replacing with a 700-r4 and a 3.73 posi........................... I want this thing to eat a stock '09 challenger (13.2 seconds) for breakfast...... can i do this on my new stock short block?........... what mods are recomended.....my idea is a weiand 142 huffer and AFR 195 heads and a blower cam........I am on a budjet and do what I can when I have the money.......... this is my daily driver...........a HT502 big block would be nice but thats $5600

thanks in advance

djracer · 02-12-2009, 04:57 PM

You can probably get there with a huffer or some spray with the motor like it is. Just be real careful on your tune up with those hyper pistons.

**americanmusc1e** · 02-19-2009, 06:27 PM

anybody know how much horsepower a stock cast 350 crank can take if its not going to be revved past 5500????????

nxtruck · 02-20-2009, 12:53 AM

The crank will take a LOT more than the hyper-pistons you have. Those pistons don't hold up well to any kind of detonation. It's not so much the power levels that will kill it as it is the detonation that could happen trying to achieve those power levels. As Kevin said, watch your tuneup with either power-adder and it will live.

LuckyHenriksen · 02-20-2009, 01:17 AM

I think that Weiand huffer and some nice heads would put you there. But as stated, the pistons would be the weak link

scatesracing · 02-20-2009, 11:45 AM

I have hyperecutec pistons in mine......... I spray it with a 200 shot.. and Its still in alive.. I know there is a little luck involved but I always keep it fat ....... And like everyone else has already said dont let it ping.. The last time out I was crossing the line at 7300.... It also has a cast crank. Its a street truck it dosnt get raced every weekend. I dont know that I would trust it to that but I dont hesitate to run the hell out of it. One more little note I built it before my daughter was born...... shes nine now.

djracer · 02-20-2009, 11:56 AM

be careful too fat will lift the ring land off the pistons. Fuel gets under the top ring land then fires and folds it right up. Its a big misconception that fat is good on a Nitrous tune up. Fat kills more stuff than lean most of the time.

Marv D · 02-20-2009, 12:44 PM

Here's what can happen NORMALLY ASPIRATED with Hypereutectic pistons, cast GM crank and just under 580HP at nearly 6800rpm.

WELL beyond thge reliability of any 'stock' component (block, crank or hyper pistons)

RPM's are much more devistating on the bottom end than brute HP.

scatesracing · 02-20-2009, 07:51 PM

I never said it was smart......... And maybe fat was the wrong choice of words. maybe make sure it dosnt lean out. better choice

02-12-2009, 04:20 PM	#1
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	Need some advice I have a '70 long fleet with a brand new (3000 miles) 350 (.060 over) it has home-ported vortec heads, a HE260 cam, 1.6 stamped roller rockers, headers, a weiand stealth intake and a 600 vacumn secondary..... the motor has dished hyperecutec pistons, stock rods, four bolt mains, 9:1 compression and a cast crank......... the truck has a th-350 and 3.08 open diff which i am replacing with a 700-r4 and a 3.73 posi........................... I want this thing to eat a stock '09 challenger (13.2 seconds) for breakfast...... can i do this on my new stock short block?........... what mods are recomended.....my idea is a weiand 142 huffer and AFR 195 heads and a blower cam........I am on a budjet and do what I can when I have the money.......... this is my daily driver...........a HT502 big block would be nice but thats $5600 thanks in advance

02-12-2009, 04:57 PM	#2
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,891	Re: Need some advice You can probably get there with a huffer or some spray with the motor like it is. Just be real careful on your tune up with those hyper pistons. __________________ 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!

02-19-2009, 06:27 PM	#3
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	Re: Need some advice anybody know how much horsepower a stock cast 350 crank can take if its not going to be revved past 5500????????

02-20-2009, 12:53 AM	#4
nxtruck Registered User Join Date: Jun 2006 Location: Jackson, Mo. Posts: 607	Re: Need some advice The crank will take a LOT more than the hyper-pistons you have. Those pistons don't hold up well to any kind of detonation. It's not so much the power levels that will kill it as it is the detonation that could happen trying to achieve those power levels. As Kevin said, watch your tuneup with either power-adder and it will live. __________________ Chris 1966 Chevy C10 LWB, 434 sbc, TH350, 12-bolt, factory suspension, pump gas 7.02 @ 95.8, 1.45 60' 1965 Chevy C10 LWB, 355 sbc, TH350, daily driver

02-20-2009, 01:17 AM	#5
LuckyHenriksen Registered User Join Date: Oct 2007 Location: Sherwood Oregon Posts: 1,908	Re: Need some advice I think that Weiand huffer and some nice heads would put you there. But as stated, the pistons would be the weak link __________________ 1968 Yenko Chevy LWB 6.0L/TH400 3/4 Drop Senior Project Build Thread Here

02-20-2009, 11:45 AM	#6
scatesracing Machinist Join Date: Sep 2007 Location: Derby Kansas Posts: 296	Re: Need some advice I have hyperecutec pistons in mine......... I spray it with a 200 shot.. and Its still in alive.. I know there is a little luck involved but I always keep it fat ....... And like everyone else has already said dont let it ping.. The last time out I was crossing the line at 7300.... It also has a cast crank. Its a street truck it dosnt get raced every weekend. I dont know that I would trust it to that but I dont hesitate to run the hell out of it. One more little note I built it before my daughter was born...... shes nine now. Last edited by scatesracing; 02-20-2009 at 11:46 AM. Reason: for got my e on note

02-20-2009, 11:56 AM	#7
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,891	Re: Need some advice be careful too fat will lift the ring land off the pistons. Fuel gets under the top ring land then fires and folds it right up. Its a big misconception that fat is good on a Nitrous tune up. Fat kills more stuff than lean most of the time. __________________ 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!

02-20-2009, 12:44 PM	#8
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: Need some advice Here's what can happen NORMALLY ASPIRATED with Hypereutectic pistons, cast GM crank and just under 580HP at nearly 6800rpm. WELL beyond thge reliability of any 'stock' component (block, crank or hyper pistons) RPM's are much more devistating on the bottom end than brute HP. __________________ 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. Last edited by Marv D; 02-20-2009 at 12:46 PM. Reason: I'll get this link right YET!!!

02-20-2009, 07:51 PM	#9
scatesracing Machinist Join Date: Sep 2007 Location: Derby Kansas Posts: 296	Re: Need some advice I never said it was smart......... And maybe fat was the wrong choice of words. maybe make sure it dosnt lean out. better choice



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