Best intake runner size for sbc 350 - Chevy Nova Forum
Visit our sponsor, National Nostalgic Nova
 
Steve's Nova Site is an automotive enthusiast website dedicated to the 1962 - 1979 Chevrolet Nova, Chevy II and Acadian automobiles. We work together to preserve, restore, drive, show, race and provide fellowship for these classic cars. This is one of the best places to find information about parts, rebuilding, restoration and racing. This website is not affiliated with GM, General Motors or Chevrolet in any capacity.

Go Back   Chevy Nova Forum > Body, Chassis and Mechanical > Drivetrain & Performance


StevesNovaSite.com is the premier Chevrolet Nova Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
Old 10th-November-2008, 01:14 AM   #1
carjai
 
carjai's Avatar

Title: Nova Guru
iTrader: (4)
Status: Offline
Join Date: Nov 2008
Location: Lawndale, CA
Nova(s): 73 nova
Posts: 660
Question Best intake runner size for sbc 350

Whats the best Intake runner size for a 350 sbc that will see about 6500-6800- rpm at the most(Iron and Aluminum)? Whose head would u recommend?
  Reply With Quote
Sponsored Links
Advertisement
 
Old 10th-November-2008, 01:17 AM   #2
The Big Al
 
The Big Al's Avatar

Title: Nova Guru
iTrader: (113)
Status: Offline
Join Date: Aug 2007
Location: Newton, NC
Nova(s): 68ss, 70ss (SOLD)
Posts: 15,913
Weiand Team G

#7530
__________________

“The bitterness of poor quality & Service remains long after the sweetness of low price is forgotten”
  Reply With Quote
Old 10th-November-2008, 01:31 AM   #3
carjai
 
carjai's Avatar

Title: Nova Guru
iTrader: (4)
Status: Offline
Join Date: Nov 2008
Location: Lawndale, CA
Nova(s): 73 nova
Posts: 660
I forgot to add heads in there somewhere
  Reply With Quote
Old 10th-November-2008, 07:17 AM   #4
Pwrtrip75
 
Pwrtrip75's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Nov 2006
Location: Janesville, WI
Posts: 2,126
whats it used for? cam? head? stall? compression? When picking anything for your engine you dont just pick it for "your engine", you need to pick it for the whole system and its application.
__________________
72 Nova- LS 370 88mm turbo 4 link
99 Transam-LS 370 76mm turbo
71 Chevelle slow 350 building a LS 5.3
  Reply With Quote
Old 10th-November-2008, 10:24 PM   #5
carjai
 
carjai's Avatar

Title: Nova Guru
iTrader: (4)
Status: Offline
Join Date: Nov 2008
Location: Lawndale, CA
Nova(s): 73 nova
Posts: 660
street/ strip but more strip than street. say 90% strip
  Reply With Quote
Old 10th-November-2008, 11:00 PM   #6
veno
 
veno's Avatar

Title: Nova Guru
iTrader: (3)
Status: Offline
Join Date: Jul 2005
Location: Splendora,Texas
Nova(s): 72 385, t350, 3.73 4w-dsk
Posts: 13,317
Quote:
Originally Posted by carjai View Post
Whats the best Intake runner size for a 350 sbc that will see about 6500-6800- rpm at the most(Iron and Aluminum)? Whose head would u recommend?
you lacking lots of info here like Pwrtrip asked for....

but based on you 350 and only turning 6800 tops... 180 cc runner, edelbrock RPM 650 holley, a 270+ but not over 276 duration cam @ .050.... with a min 3000 stall...

you compression is critical, as is squish/quench... gears, converter, cam, etc....
__________________
a nation of free men, shall live forever, or die by suicide
  Reply With Quote
Old 11th-November-2008, 01:28 PM   #7
levisnteeshirt

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Oct 2008
Location: heading south
Nova(s): shopping for the 6th one
Posts: 4,597
double hump,,

I think the 461 or 462 chevy heads are still tough to beat for the RPM range your talking about and on a 355. Yes they are getting old but yes they didn't get their reputation for not being good. MY engine builder friend just built a 355 with 462's and a hydraulic cam ( Lunati ) that ran a 6.90 in an S10 on pump gas.
  Reply With Quote
Old 11th-November-2008, 02:11 PM   #8
carjai
 
carjai's Avatar

Title: Nova Guru
iTrader: (4)
Status: Offline
Join Date: Nov 2008
Location: Lawndale, CA
Nova(s): 73 nova
Posts: 660
For some reason i see the double humps work for alot of people, but people say any aftermarket head head is better than a set of those ported. How true is that
  Reply With Quote
Old 11th-November-2008, 03:09 PM   #9
D-Man
 
D-Man's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Sep 2007
Location: New Caney,Texas
Posts: 3,731
Quote:
Originally Posted by carjai View Post
For some reason i see the double humps work for alot of people, but people say any aftermarket head head is better than a set of those ported. How true is that
Very true.. Vortec heads are even a BIG step up from the old "Camel Humps"..

It's all in the combination of parts chosen and making sure they all work together. I've seen a lot of 10 and 11 second street cars built (as Judson Massingil once said) "That's a great combination of $@#%^ parts!"...
__________________
"Never trust a government that doesn't trust its own citizens with guns."
--Thomas Jefferson
  Reply With Quote
Old 11th-November-2008, 03:21 PM   #10
carjai
 
carjai's Avatar

Title: Nova Guru
iTrader: (4)
Status: Offline
Join Date: Nov 2008
Location: Lawndale, CA
Nova(s): 73 nova
Posts: 660
As far as parts working together, do u mean rpm range. How can u figure out the rpm range of some vortecs or ported camel humps
  Reply With Quote
Old 12th-November-2008, 11:54 AM   #11
levisnteeshirt

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Oct 2008
Location: heading south
Nova(s): shopping for the 6th one
Posts: 4,597
Quote:
Originally Posted by carjai View Post
For some reason i see the double humps work for alot of people, but people say any aftermarket head head is better than a set of those ported. How true is that
Its probably one of those crazy trade offs that only a person that can use a slide rule can understand. Velocity through the port compared to flow. One thing the average person can understand is what a time slip says. I've saw a few people buy a big set of heads and slow down a tenth or so. So what happened ?? I'd say the loss of velocity going through the bigger port wasn't compensated by the additional flow at the speed the particular engine was running. Put your thumb over the end of a water hose and watch the flow of water speed up, but with less flow. The cylinder of a small port head must fill faster because of the speed the charge is traveling through the port, but it will probably hit a brick wall at higher RPM's and stop accelerating because now its needing alot more flow to continue to feed the engine at higher RPMs . Look at how well some 302 Fords run that have very small ports. Compared to a Chevy it doesn't look like there is a chance for a Ford to run well at all. But they do, to a certain level. Getting a good combination of parts to work together is not easy but its the reason some cars seem to run faster than they should when you know whats in the engine.
  Reply With Quote
Old 12th-November-2008, 12:25 PM   #12
D-Man
 
D-Man's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Sep 2007
Location: New Caney,Texas
Posts: 3,731
Quote:
Originally Posted by carjai View Post
As far as parts working together, do u mean rpm range. How can u figure out the rpm range of some vortecs or ported camel humps
It can get extremely complicated especially when you start trying to look at ported heads. Who ported them? Were they "Really hogged out"? Is the throat size vs. average runner CSA vs. valve diameter all proportionate and correct. There's a hell-of-a-lot more to it than 90% of the people out there know or could even comprehend.
Then comes camshaft timing. There's some real wizardry going on there as well. Start the intake charge a little too soon and you could loose the ram-fill effect, disrupt the intake charge with reversion, etc.... Start the exhaust event a bit too soon and you give up power. Start it too late and the piston will see too much heat and pressure spikes, it will be inefficient at expelling the exhaust (disrupt in the intake charge), and will totally kill any chance of using the exhaust to scavenge--or help start the intake charge.

As far as matching the components together for a good combination......that can be fairly simple. You just have to be completely honest as to where the engine is going to spend the majority of it's time (RPM range) and shoot for the fattest torque curve and peak power.
The torque converter should "Stall" just a little below your peak torque and the rear end gearing should put you right at your red line as you cross the finish line.
Now, If it's more of a street car, then there's a long list of compromises that will hurt a little performance but make it more "Streetable" but that's completely relative!!

First, decide what the car's primary role is going to be.
Second, list out the parts you've already got.
Then you will get a lot of usable feed-back on your parts selection process.
__________________
"Never trust a government that doesn't trust its own citizens with guns."
--Thomas Jefferson
  Reply With Quote
Old 12th-November-2008, 03:24 PM   #13
Pwrtrip75
 
Pwrtrip75's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Nov 2006
Location: Janesville, WI
Posts: 2,126
Quote:
Originally Posted by levisnteeshirt View Post
I think the 461 or 462 chevy heads are still tough to beat for the RPM range your talking about and on a 355. Yes they are getting old but yes they didn't get their reputation for not being good. MY engine builder friend just built a 355 with 462's and a hydraulic cam ( Lunati ) that ran a 6.90 in an S10 on pump gas.
They got their reputation because they were all that was available at the time and they were on the "corvette" engines which were big and bad back then. Im guessing what your engine builder did with those 462s was at least some work which is time and money. You can take a set of todays heads out of the box and run circles around those worked over heads....at a fraction of the price it costs to work them over.
So "tough to beat"..... not in the least bit.

How is that so new heads unoported beat old ported ones? Intake runner volume, bowl volume and design, chamber design. The old heads were made for a 327ci engine, not anything bigger.
__________________
72 Nova- LS 370 88mm turbo 4 link
99 Transam-LS 370 76mm turbo
71 Chevelle slow 350 building a LS 5.3

Last edited by Pwrtrip75; 12th-November-2008 at 03:28 PM.
  Reply With Quote
Old 12th-November-2008, 04:17 PM   #14
carjai
 
carjai's Avatar

Title: Nova Guru
iTrader: (4)
Status: Offline
Join Date: Nov 2008
Location: Lawndale, CA
Nova(s): 73 nova
Posts: 660
The car is 85% strip- 15% street!!! I already have 3.73 gears in the rear. Im looking forward to build a 350. I guess the motor will spend most of its time above 3k. Whats a good rpm range for 3.73 gears as far as 1/8th mile and 1/4 mile go?
  Reply With Quote
Old 12th-November-2008, 05:23 PM   #15
NOVACA1N
 
NOVACA1N's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Feb 2006
Location: Long Island
Nova(s): '71 Nova- Nitrous freak
Posts: 2,505
Don't waste your money on "Camel Hump" heads...Pretty much any aftermarket cylinder head is better than those fossils.

Now, you can't expect accurate answers when you ask such vague questions. Is this 350 standard bore/stroke? Trans type/converter? Gears? Tire size/type? Suspension type? The list goes on...What do you have???
__________________
aka SmallBlockNova
  Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Which and why: 350 vs. 383 Bscman Drivetrain & Performance 37 25th-January-2014 03:42 PM
Vacuum Advance 101 the FLYER Best of Drivetrain & Performance 20 1st-October-2008 12:32 AM
Redoing my engine this winter! 270win Drag Racing Forum 130 13th-August-2007 07:51 AM
Would this intake be good for my engine? Dawg Drivetrain & Performance 9 21st-June-2007 02:57 PM
Intake manifold for a 350 SB, 450 hp Coaltrain Drivetrain & Performance 6 17th-June-2006 09:40 PM


Site best viewed set to 1024 x 768.

All times are GMT -4. The time now is 01:12 PM.

Custom Designed for Steve's Nova Site by: vBSkinworks

 
Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Lt

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.