Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

18* head flow numbers inside = )

Thread Tools
 
Search this Thread
 
Old Mar 11, 2006 | 09:04 PM
  #1  
topend's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2004
Posts: 199
Likes: 0
Default 18* head flow numbers inside = )

well finally i have heads that flow great.

Brodix 18c

Lift intake and exhaust at 28" drop


.100 64.6
.200 129.4 128.2
.300 198.1 191.4
.400 262.0 232.5
.500 314.3 252.0
.600 347.9 262.2
.700 373.9 267.2
.800 378.3 270.0
.850 378.7 270.2

Im very happy with the results.The heads flowed within 2% of advertised. The exhaust outflowed my brodix 10x unported on the Intake side lol.
the only thing i have left to do is pick a cam.Im thinking of going with cam motion.What cam and/or cam company do u guys recommend???(anything but comp cams)
Reply
Old Mar 11, 2006 | 09:42 PM
  #2  
LS1SSII's Avatar
Staging Lane
iTrader: (2)
 
Joined: Feb 2005
Posts: 74
Likes: 0
From: Peoria, IL
Default

I have had Cam Motion grind me three cams and they are all great. I will only use them.

Are your heads CNC spread port?
Reply
Old Mar 11, 2006 | 09:54 PM
  #3  
topend's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2004
Posts: 199
Likes: 0
Default

Are your heads CNC spread port?
yes they are cnc`d

Check out the pics here

18* topend
Reply
Old Mar 12, 2006 | 11:22 AM
  #4  
PRAY HRD's Avatar
9 Second Club
iTrader: (119)
 
Joined: Aug 2003
Posts: 2,972
Likes: 1
From: CISSNA PARK, IL
Default

looks like some good #'s. how much lift are you actually looking at making? and what's the setup, turbo or s/c?
Reply
Old Mar 12, 2006 | 01:13 PM
  #5  
topend's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2004
Posts: 199
Likes: 0
Default

looks like some good #'s. how much lift are you actually looking at making? and what's the setup, turbo or s/c?
the cam numbers i dont know yet. i faxed my setup to cam motion. i`ll post on what they recommend.The shaft roller rockers have a 1.7 in and 1.6 ex.
Im going NA with my motor, nitrous maybe later.compression should be in the 14+ to 1 range.Flat top pistons netted 13 to 1 .
Reply
Old Mar 12, 2006 | 03:35 PM
  #6  
PRAY HRD's Avatar
9 Second Club
iTrader: (119)
 
Joined: Aug 2003
Posts: 2,972
Likes: 1
From: CISSNA PARK, IL
Default

oh, ok. i didn't realize this was a race application. so what kind of car?
Reply
Old Mar 13, 2006 | 12:01 AM
  #7  
93LT1's Avatar
Teching In
 
Joined: Jun 2005
Posts: 49
Likes: 0
Default

do they make heads for a LT1??
Reply
Old Mar 13, 2006 | 06:48 PM
  #8  
slow trap's Avatar
TECH Addict
iTrader: (22)
 
Joined: Sep 2004
Posts: 2,639
Likes: 0
From: tennessee
Default

i'll take a stab at the cam size not knowing how many cubes you're running=276 @.050 intake,284 @.050 exhaust,.710-740 lift with your rockers.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Mar 13, 2006 | 06:56 PM
  #9  
topend's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2004
Posts: 199
Likes: 0
Default

oh, ok. i didn't realize this was a race application. so what kind of car?
89 Trans Am


i'll take a stab at the cam size not knowing how many cubes you're running=276 @.050 intake,284 @.050 exhaust,.710-740 lift with your rockers.
the motor is a dart block 4.185 bore by 3.875 stroke =426". The heads were flowed on a 4.155 bore so flow should pick up with my bore.I dont think your to far off with your cam recommendation .
Reply
Old May 21, 2006 | 09:47 AM
  #10  
topend's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2004
Posts: 199
Likes: 0
Default

Here`s my cam specs to my daily driver
Intake Exhaust
Duration 282 288.5 @ .050
Lift .782 .714

Lobe separation 109.9
Reply
Old May 21, 2006 | 11:36 AM
  #11  
TwoFast4Lv's Avatar
10 Second Club
20 Year Member
Photogenic
iTrader: (8)
 
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Default

Nice numbers! I will probably be selling my Brobix 18* heads to pick up a set of CFE 18* heads.

To use them on a LT1 they need to be converted. I will be using mine on a LT1 I already have a Hogans Intake ready to do go.

I also order all the company cams through Cam Motion I try to keep lift in the low to Mid .600s so valve guide wear is not an isuue for a street car

BTW what CC's are the intake ports and the chambers?
Reply
Old May 21, 2006 | 12:24 PM
  #12  
topend's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2004
Posts: 199
Likes: 0
Default

Originally Posted by TwoFast4Lv
Nice numbers! I will probably be selling my Brobix 18* heads to pick up a set of CFE 18* heads.

To use them on a LT1 they need to be converted. I will be using mine on a LT1 I already have a Hogans Intake ready to do go.

I also order all the company cams through Cam Motion I try to keep lift in the low to Mid .600s so valve guide wear is not an isuue for a street car

BTW what CC's are the intake ports and the chambers?
If u put those heads and intake on your LT1 could u still call it a LT1???

I should of gone with a Hogans manifold too but at the time i was tossing the idea of going with a carb or fuel injection. So undecided i went with a regular intake manifold instead.

the chamber is 53cc and the port is 280 cc
Reply
Old May 21, 2006 | 12:40 PM
  #13  
TwoFast4Lv's Avatar
10 Second Club
20 Year Member
Photogenic
iTrader: (8)
 
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Default

Originally Posted by topend
If u put those heads and intake on your LT1 could u still call it a LT1???

I should of gone with a Hogans manifold too but at the time i was tossing the idea of going with a carb or fuel injection. So undecided i went with a regular intake manifold instead.

the chamber is 53cc and the port is 280 cc

LOL the arguement of the decade! I still have an LT1 block and it is reverse flow and it is an Expensive PITA to get done. Sounds like a LT1 to me!

I sold a Complete LT4 top end to get the intake alone. I was thinking of going 23* RR but figured WTF if I am going to do lets do it all the way I have most of what I need. I had planned on just getting this set of heads finished but for the price I might as well just buy another set finished and be done with it.

here are a few pics
http://groups.msn.com/WashingtonFBod...to&PhotoID=519
http://groups.msn.com/WashingtonFBod...to&PhotoID=518
http://groups.msn.com/WashingtonFBod...to&PhotoID=517
http://groups.msn.com/WashingtonFBod...to&PhotoID=520
http://groups.msn.com/WashingtonFBod...to&PhotoID=530
http://groups.msn.com/WashingtonFBod...to&PhotoID=531
http://groups.msn.com/WashingtonFBod...to&PhotoID=521
http://groups.msn.com/WashingtonFBod...to&PhotoID=522
http://groups.msn.com/WashingtonFBod...to&PhotoID=529


Keep us up to date on you project!

BTW what car is it going in?
Reply
Old May 21, 2006 | 01:13 PM
  #14  
topend's Avatar
Thread Starter
On The Tree
 
Joined: Nov 2004
Posts: 199
Likes: 0
Default

thats a nice intake manifold u have there.

My car is 89 GTA .
Reply




All times are GMT -5. The time now is 10:14 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE