Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Tech/Performance
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette Sponsored by
VBP

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 11-17-2001, 01:12 PM   #1
rainman69
CF Senior Member
 
rainman69's Avatar
 
Member Since: Oct 2001
Location: Westampton NJ
Default Stock "Camel Hump" flow?

Does anyone have flowbench numbers for a set of -186 "Camel Hump" heads?

Thanks in advance. :smash:
rainman69 is offline   Reply With Quote
Old 11-17-2001, 02:16 PM   #2
SteveG75
CF Senior Member
 
SteveG75's Avatar
 
Member Since: Jun 2000
Location: Lusby MD
Default Re: Stock "Camel Hump" flow? (rainman69)

Try http://www.chevyhiperformance.com and the Cyber-Flow link. They have a lot of flow info there but I am not sure about the the -186's.
SteveG75 is offline   Reply With Quote
Old 11-17-2001, 04:09 PM   #3
Rowdy Rat
CF Senior Member
 
Rowdy Rat's Avatar
 
Member Since: Dec 1999
Location: PA
Stans.Corvette.Restoration
Default Re: Stock "Camel Hump" flow? (rainman69)

Stock "186" heads with 1.94"/1.50" valves and no modifications whatsoever flow right around 180cfm/121cfm (at 25" of water and .485"/.450" of valve lift). A good three angle valve job, backcutting the valves and increasing valve size to 2.02"/1.60" will get you up around 206cfm/155cfm... At least according to David Vizard's testing.

Any luck with photos of your clutch assembly? I've talked to a couple of owners of original cars since that thread was active and they swear that the 11" clutch/14" flywheel was what was installed in their cars... If your 10.4"/12.75" setup was originally installed in your car, you might have a real oddball there!

Regards,
Rowdy Rat is offline   Reply With Quote
Old 11-17-2001, 05:10 PM   #4
MassVette
CF Senior Member
 
MassVette's Avatar
 
Member Since: Oct 2000
Default Re: Stock "Camel Hump" flow? (rainman69)

Try GM performance parts--they have a complete chart for all the SB and BB Chevy heads. And I believe these heads weren't near the top, but check it out. Seems to me the Vortec and SB II heads were quite high in flow, according to GM---
:yesnod: :chevy :chevy :chevy :yesnod:
MassVette is offline   Reply With Quote
Old 11-18-2001, 06:45 PM   #5
rainman69
CF Senior Member
 
rainman69's Avatar
 
Member Since: Oct 2001
Location: Westampton NJ
Default Re: Stock "Camel Hump" flow? (MassVette)

So, I tried http://www.chevyhiperformance.com/ and I can't get to it. It just keeps reloading the page every second or so. What the heck???

Thanks for the info so far, I'll keep looking. :smash:
rainman69 is offline   Reply With Quote
Old 11-18-2001, 07:30 PM   #6
Stingy74
CF Senior Member
 
Stingy74's Avatar
 
Member Since: Apr 2001
Location: Regina Saskatchewan, Canada.
Send a message via MSN to Stingy74
Default Re: Stock "Camel Hump" flow? (rainman69)

Back in the day a friend of mine ran 10.15's in a super gas Vega he built from scratch. He was young and poor and used a set of double bumps that he had heavily ported. They must have flowed good to be that fast but then again the car only weighed 2200 pounds and made up for lost power elsewhere. That's a while ago but he consistantly tells me he would have run 9.40's or better like everyone else, had he had better flowing heads and a Lenco transmission and stuff. I'm assuming you could probably get them to flow like 250 or something but that's completely a guess. Most enlarged port race heads flow close to or over 300 cfm.
Stingy74 is offline   Reply With Quote
Old 11-18-2001, 08:09 PM   #7
rainman69
CF Senior Member
 
rainman69's Avatar
 
Member Since: Oct 2001
Location: Westampton NJ
Default Re: Stock "Camel Hump" flow? (Stingy74)

Can anyone get to these charts? GM Performance Parts was rather worthless unless you know the part number as far as I could find.
http://www.chevyhiperformance.com just won't open. So, if anyone else can get to these charts and email them or post them (text preferred)...
rainman69 is offline   Reply With Quote
Old 11-19-2001, 02:00 AM   #8
SteveG75
CF Senior Member
 
SteveG75's Avatar
 
Member Since: Jun 2000
Location: Lusby MD
Default Re: Stock "Camel Hump" flow? (rainman69)

OK, my bad, got to go to Best of CHP Engine Tech, then Engines, then Cyber Flow to Go. And they don't have a listing for the 186 heads. Probably the closest is the 462 heads which ere used on 327's thru 1968.

462 heads:

Lift Intake Flow Exhaust Flow

0.050 18 27
0.100 50 54
0.200 119 88
0.300 167 116
0.400 198 128
0.500 212 134
0.600 218 137

Hope this helps. Should be fairly close.
SteveG75 is offline   Reply With Quote
Old 11-19-2001, 02:19 PM   #9
Rowdy Rat
CF Senior Member
 
Rowdy Rat's Avatar
 
Member Since: Dec 1999
Location: PA
Stans.Corvette.Restoration
Default Re: Stock "Camel Hump" flow?

The Chevy High Performance flow numbers were measured at 28" of water... The test numbers in David Vizard's books are typically taken at 25" of water. The CHP numbers will be higher as a result.

Just something to keep in mind when looking at flow test data. :)

Regards,
Rowdy Rat is offline   Reply With Quote
Old 11-20-2001, 11:41 PM   #10
adam
CF Senior Member
 
adam's Avatar
 
Member Since: Jul 2000
Location: Allen, TX, USA
Default Re: Stock "Camel Hump" flow? (rainman69)


Vizard's Book How to Build max performance SBC, says:

(reading from a graph)

186's @ 28 in h20

lift intake exhaust
100s 44 60
200s 75 110
300s 112 160
400s 125 180
500s 135 190
600s 140 191
700s 143 192

Pg. 84 Fig 9-4.

adam is offline   Reply With Quote
Old 11-21-2001, 02:42 AM   #11
Dino_'72
CF Senior Member
 
Dino_'72's Avatar
 
Member Since: Aug 2000
Location: Vancouver B.C.
Default Re: Stock "Camel Hump" flow? (adam)

Check out these links for flow numbers relating to various heads. I believe 186s are a similar casting to 462 and 492.
http://www.topher.net/~bearman/gmheadcomp.html http://www.geocities.com/MotorCity/Speedway/5117/flow/ http://www.castheads.com/heads/heads.htm

Dino.
Dino_'72 is offline   Reply With Quote
Old 11-21-2001, 11:29 AM   #12
Rowdy Rat
CF Senior Member
 
Rowdy Rat's Avatar
 
Member Since: Dec 1999
Location: PA
Stans.Corvette.Restoration
Default Re: Stock "Camel Hump" flow?

David Vizard seems to be one of the few people still interested in testing the older original engine parts as well as the current offerings. He has put together some great books over the years and I would recommend reading ANYTHING he has written.

I went back through his book How To Build And Modify Chevrolet Small Block V8 Cylinder Heads last night (where I found the original flow numbers that I posted) to see what else I could turn up... Ran across a sidebar on page 66 that noted while the flow numbers in the book were taken at 25" of water, it was possible to convert pressure drops to allow direct comparison of flow numbers. The formula that David Vizard gave was:

[(New Pressure Drop/Old Pressure Drop)^(1/2)] x Flow at Old Pressure Drop

For example: going from measurements taken at 28" of water to 25" of water;

[(25"/28")^(1/2)] x Flow at 28"
[.8928571^(1/2)] x Flow at 28"
.9449112 x Flow at 28"

For those interested in making "apples to apples" comparisons of flow numbers taken at different pressure drops, this should be a big help.

Regards,
Rowdy Rat is offline   Reply With Quote
Old 11-21-2001, 11:29 AM
 
Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Tech/Performance
Reload this Page Stock "Camel Hump" flow?
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
It's Hump Day Camel time- Twerk style. Crank it up! corvettezman Off Topic 20 11-07-2013 09:40 AM
WTB SBC Header/SidePipe Combo ThorpesCorvettes C3 Parts for Sale/Wanted 0 03-01-2013 02:44 AM
Double hump heads vs Camel hump heads Mark_Milner C1 & C2 Corvettes 19 02-09-2013 12:49 AM
3890462 Camel Hump Cylinder Heads For Sale vintagecorvette C1 & C2 Parts 4 11-23-2009 10:01 PM
Accessory Bolt Holes for Camel Hump Heads??? toddalin C1 & C2 Corvettes 13 04-12-2005 03:56 PM


Tags
186, 191, 462, 492, camal, camel, cfm, chart, david, flow, heads, heaf, hump, humps, numbers, stock, tomahawk, vizzard


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -4. The time now is 11:51 PM.


Emails & Password Backup