BAE heads BAE-6 vs BAE-8

Here is my understanding

BAE 5 heads are the Fatheads and have 101 cc chambers with single plug holes and are designed for blown alcohol applications on both PM or TAFC

BAE 6 have big chambers and dual plug holes and are for fuel cars

BAE 8 is the latest and greatest version of the BAE 5 for blown alcohol with single plug holes and new designed intake runners and other modifications.

 

OK, they changed some stuff in the last two years.
BA-5 comes is two main versions which started about two years ago before that they only had a single version. They now have the alcohol and the A-Fuel head. The alcohol head comes in two versions one being for certain promod classes with small valve rules. The A-Fuel head has dual plugs and smaller ports to keep the air velocity up.

BA-6 also comes is two main versions also, the alcohol and the A-Fuel head. The alcohol head comes in two versions one being for certain promod classes with small valve rules. The A-Fuel head has dual plugs and smaller ports to keep the air velocity up and is basically the same as a BA-5 head. The alcohol version has bigger valves and better seat angles than the BA-5 head

BA-8 comes is two main versions, the alcohol and the A-Fuel head only. The alcohol version has too big of valves for PM classes that have valve size restrictions so cannot be used in JEGS ProMod Class. The alcohol version has a reshaped chamber, better port and bigger valves that a BA-6. The A-Fuel head has dual plugs and smaller ports to keep the air velocity up with reshaped chambers for nitro and different seat angles and valve sizes. The intake runner has a small vane in it on the A-fuel head to split the air and keep the velocity up.

Randy, you happy now.

 

differences

Like mentioned, call BAE, but to clear up some misinfo...

BAE Fathead 5- There was actually several versions of this. The head has a 2.425 intake valve. All versions of the 5 have the same valves. This head was offered intially as a dual plug head because that was the norm when they came out. Most blown alky cars were running dual mag, in addition to the A/F cars. Then came the next 'version' with CNC intake runners, which were predominantly single plug. The CNC intake runner heads flowed better and you can tell due to the slightly 'ribbed' finish to the intake runner. Some referred to these as '6' heads back in the day, but all of that went away when the real 6 came out.

BAE Fathead 6- As mentioned, this head was predominantly designed for Pro Mod to adhere to their 2.400 intake valve limit on a billet head hemi. The head features a slightly raised intake port and a D-shaped exaust port. Neither valve from the 5 will work, although all rocker gear will work. A .25" spacer is necessary under the intake to make the intake mate up with the higher intake runner.

BAE Fathead 8- I don't know quite as much about these as I haven't raced with them. The intake port features a divider from the bottom of the intake floor to meet up with the divider in the top of the port all heads have that diverts the air around where the valve stem enters the port. The head also features a 2.450 intake valve. I believe the exaust is the same as the 6.

I hear a BAE 7 is in the works that will combine the features of the 8 with the 2.400 valve to make it legal for Pro Mod competition. That's the story I hear why they skipped the '7'

Also it should be noted that these are 'Fatheads' I don't remember what exactly the BAE 5 cc'd out to, but I know a BAE 6 was 96 cc with a half dish exaust valve. There are multiple stages of the fuel heads, which I'm not as familiar with. Many times fuel heads are referred to as '3' heads. The fatheads really didn't start until they called them Fathead 4's.

 

My data came from BAE

 

In my conversation with BAE they said that the term Fat Head applies to -3, -4, -5, -6, and -8 heads