port or not port heads

[hotrodharley]

building my first blower engine and confused on what to do with heads.
eng. specs;
540ci[4;25 stroke-4.50 bore]
11.8 to 1 comp
736 lift rollor cam
12-71 alcohol blower[25% od]
enderle "big&ugly" injector hat
mallory super maglll
enderle 110 pump


the heads i have are bordix 2-plus;;should i spend the $1000 or about to have heads flowed or save my money?i'm on a very tight budget but don't want to cut corners either.how much advantage will this $1000 on heads give me..i think i already know answer but would like to hear from experiance blown alcohol engine builders.as i stated--first blower and first alky engine.

[ashbros]

Looks Like your just about ready to get serious. LOL

Nothing better than a blower motor..

Save your money and buy a nice set of titanium retainers for your heads.

The Brodix BB2 heads are a great head, These are a CNC head from the factory, so extensive porting isnt neceaasry nor is polishing but,
In most cases, I just tear down the heads lightly sand down all rough areas in the runners and chambers to a smooth finish, polish the heck out of the runners and chambers, Clean the heads of all debris and reassemble with titanium retainers and check the spring pressures open and closed.

Whats your engine cubic inch displacement? Your cam seems to have enough lift, but curious as to what your lobe seperation and duration is?

Is compression ratio calculated including blower boost or are you starting out at 11.8:1?

If you run too high of compression 16+ or 17:1 on boost you may see better results running high octane race fuel. The highest you can find... Don't get me wrong your motor will run just fine on alcohol, but there are differing levels of fuel for differing levels of compression to maximize optium performance.

If I am not mistaken these heads flow factory around 340 to 350 but I don't know if they are designed to be ran over 7500 RPM.

Seems there should be some standard recommendations that come in the box when you purchased the heads.

Not to be redundent, save your money...

Have fun doing what your doing..... :D

[OneBadGMC]

Are you smoking crack Barry? There is NOTHING better than alky for roots blown, except roots blown alky w/nitro!!!

Gas and roots /facepalm

I had a set of GM 990 heads that flowed the same as your Brodix 2+ (350/230 @ .700) on my 505.

It was an 11.5:1 static motor, similar cam (Ultradyne .723/.725).

With 18 PSI (about 22% OD on an 8-71) with just hat nozzles, the motor made 1200 HP on the dyno.

Here's the dyno sheet.

http://www.onebadgmc.com/gallery/displayimage.php?pid=113&fullsize=1

The small blower held that motor back. You should be able to make some good power with it. Even better if you step up on cam and port flow.

[bbchevy]

Those Heads are NOT CNC!
Unless they are M2 or WP .
And they are only Good for the Under 500" Motors,Unless they are an EXTRA head,then good for a 565" Motor.
I was thinking that your motor was in the 572" range,but maybe Not?
Later
G 8)

[hotrodharley]

Looks Like your just about ready to get serious. LOL

Nothing better than a blower motor..

Save your money and buy a nice set of titanium retainers for your heads.

The Brodix BB2 heads are a great head, These are a CNC head from the factory, so extensive porting isnt neceaasry nor is polishing but,
In most cases, I just tear down the heads lightly sand down all rough areas in the runners and chambers to a smooth finish, polish the heck out of the runners and chambers, Clean the heads of all debris and reassemble with titanium retainers and check the spring pressures open and closed.

Whats your engine cubic inch displacement? Your cam seems to have enough lift, but curious as to what your lobe seperation and duration is?

Is compression ratio calculated including blower boost or are you starting out at 11.8:1?

If you run too high of compression 16+ or 17:1 on boost you may see better results running high octane race fuel. The highest you can find... Don't get me wrong your motor will run just fine on alcohol, but there are differing levels of fuel for differing levels of compression to maximize optium performance.

If I am not mistaken these heads flow factory around 340 to 350 but I don't know if they are designed to be ran over 7500 RPM.

Seems there should be some standard recommendations that come in the box when you purchased the heads.

Not to be redundent, save your money...

Have fun doing what your doing..... :D

11.8 is static comp. before boost.below is cam card specs that came with cam.
http://i8.photobucket.com/albums/a43/hotrodharley/CCF09152009_00000.jpg

[ashbros]

Heres a link for brodix bb-2 plus

http://www.brodix.com/heads/bb2.html

Here some info I have copied and pasted for ya.

bbchevy you might be on to something their recommendation for engine size does not exceed 509 cid

Says they are CNC ported The BRODIX porting design was incorporated into a 100% CNC ported masterpiece that can be mass produced. The CNC ported BB-2 Plus castings are CNC ported to a mirror finish and flow within 1% of each other.

Cubic Inch Compression Camshaft RPM

BB-2 PLUS 427 - 509 11.5 Minimum Flat Tappet/Roller 4000-7200

Also states they flow 344 at 0.700 lift

Onebad, no cracky cracky today, lol. I spoke out of context. Using fuel with roots application would generate too much heat causing bad fuel atomization and a loss of power, unlike alcohol and nitro.

As a general rule of thumb, Alcohol is recommended for use between 12.5:1 to 16.5:1 in N/A motors. The key phrase there is "N/A motors"

[/quote]

[OneBadGMC]

The heads are a bit small, but they'll work. Boost over comes a LOT of head restriction issues.

A Dart 360 or 380 would be a better choice, if not a Brodix BB2-Xtra.

As I've said many times before... You can't put too much cam or head on a blower motor... Only too small.

[bbchevy]

Heres a link for brodix bb-2 plus

http://www.brodix.com/heads/bb2.html

Here some info I have copied and pasted for ya.

bbchevy you might be on to something their recommendation for engine size does not exceed 509 cid

Says they are CNC ported The BRODIX porting design was incorporated into a 100% CNC ported masterpiece that can be mass produced. The CNC ported BB-2 Plus castings are CNC ported to a mirror finish and flow within 1% of each other.

Cubic Inch Compression Camshaft RPM

BB-2 PLUS 427 - 509 11.5 Minimum Flat Tappet/Roller 4000-7200

Also states they flow 344 at 0.700 lift

Onebad, no cracky cracky today, lol. I spoke out of context. Using fuel with roots application would generate too much heat causing bad fuel atomization and a loss of power, unlike alcohol and nitro.

As a general rule of thumb, Alcohol is recommended for use between 12.5:1 to 16.5:1 in N/A motors. The key phrase there is "N/A motors"

[/quote]

If He has the CNC BB-2 Plus Version,NOT ALL BB-2 Heads are CNC Ported.
Later
G 8)
Also AGGREE BIGTIME with GMC,that the 360 Dart Head with a S/Charger Is BADDAZZZZ!

[hotrodharley]

my heads isn't c&ced.still rough casting inside ports.

[OneBadGMC]

my heads isn't c&ced.still rough casting inside ports.

Run it like it is. If you're not happy, rather than spending more money on those heads, which are too small even CNC'd, sell em and get better heads.

[bbchevy]

You ALWAYS have a OPTION when a S/Charger is Involved!
A SMALLER TOP PULLEY!!!OR FUEL?
Personally,I LIKE BOTH!
Later
G 8)

[bjuice]

onebadgmc i was impressed with the Tq Curve on that ENGINE of Yours ....that was one Pulling SOB wasn't it ?
thats what i love about Blowers...the freakin constant TQ curve

HotRod i ran the BB-2 on my 565ci and it was down a tad on HP but it made More TQ being a little smaller head ( valve Size)...i had alot of Port work done to them...No flow bench work.
Best to my knowledge the valve size difference on the bb-2 head VS the bb-2 extra is the 2.25 VS 2.30 on the intake valve.
as GMC said above the Blower will get the air thru them...just get your cam profile right on the lobe seperation so it can let the Boost out.

IMO you would be throwing that 1k away....and even if it did pick it up 30/40 hp...i doubt very seriously you would even notice it...Your gonna have enough problems planting what you got.... :shock:

But if you just determined to spend some Money on Heads...sell the ones you got, take the 1,000 cash and Buy you some BB-3 Oval Ports..
other then this...save the cash....Maybe take that 1k and spend it toward some R/D With Some E-85.........Pro-systems swears they got the carb deal figured out....

105 octane for 2.10 a gallon.....hey why not ?...i am going this route with a blow thru procharger

[hammertime]

Maybe take that 1k and spend it toward some R/D With Some E-85.........Pro-systems swears they got the carb deal figured out....

105 octane for 2.10 a gallon.....hey why not ?...i am going this route with a blow thru procharger

I like that idea :D 2.10 a gallon nice :lol:

Pro System and APD both have a handle on them

[cepx111]

Sorry for the Hijack, but where would one get some E-85 @?

To my knowledge it's not in the Memphis metro area yet.


Cp

[cepx111]

N/M

I answered my own question, did a google search, only a few cities in Tn that sell E-85, closiest is Nashville and it was only one station.

I checked my old residence of Sioux Falls, South Dakota.

16 stations in that one city alone.

They have plenty corn up there.
Cp

[maxpower671]

Brian,

did i read that right, a procharger? :o blow thru? :shock: :shock:

[OneBadGMC]

http://www.racingjunk.com/category/1283/Heads/post/1644275/Dart-360-heads-and-Jesel-shaft-rockers.html

There's the heads you need (no, I don't know the seller or the condition of the heads).

[bjuice]

Brian,

did i read that right, a procharger? :o blow thru? :shock: :shock:


oh YEAH a very effective way to run a procharger !

[bbchevy]

http://www.racingjunk.com/category/1283/Heads/post/1644275/Dart-360-heads-and-Jesel-shaft-rockers.html

There's the heads you need (no, I don't know the seller or the condition of the heads).
Just take a MINUTE and LOOK at the PIctures?See if the WORD EXPLOTION,Or BOOM enters the Equation....................?MAYBE :shock: :shock:
Later
G 8)

[OneBadGMC]

http://www.racingjunk.com/category/1283/Heads/post/1644275/Dart-360-heads-and-Jesel-shaft-rockers.html

There's the heads you need (no, I don't know the seller or the condition of the heads).
Just take a MINUTE and LOOK at the PIctures?See if the WORD EXPLOTION,Or BOOM enters the Equation....................?MAYBE :shock: :shock:
Later
G 8)

ExploSion even. :D

Yeah, they look a bit rough... BUT, that being said... Aluminum heads are pretty much infinitely repairable.

If they have the Pro-Series Jesel (and not the sportsman), it's a decent deal, depending on what the rest of the head looks like. Would be worth inquiring for some more detailed photos before writing it off.

[71]

I had good luck porting some Brodix -2 heads. Went from just over 300cfm to 390cfm. Brett Bowers did the porting in Fort Collins,CO. I know some people have had bad luck with him ripping them off but I had no problems. That was 2 years ago and I think he had some strange things going on with his buisness but don't know all the details. He was great to work with for me though. Anyways. I moved from KS where altitude is 1200 ft. to CO where it is 5800 ft and the car ran the same in CO as it did in KS after porting. My buddies that come up and race in CO see a .6 sec. difference so porting helped considerably. They are the small 305cc intake runner on a 540 with a single 4 barrel. 720 lift roller 15:1 comp. on gas. Small heads for this motor but they work. It ran 8.50's in a 2000lb altered and 8.11 @ 163 with a 150 shot. Never did go back to lower altitude but is should have run a 7.90 on the motor comaring to my buddies cars. No blower though so it's not a good comparison for your setup.