AFR BBF Head

Carl wrote:Clearly a bogus marketing ploy.  

(joking)

Impressive work.  Congratulations!


.

Personal attack on.....

Now guys like you can build race engines that make more than 1.5 hp per cube!

Personal attack off....

STR-LGL-70 wrote:I just re-read through this build and maybe I missed it, but what is the bore & stroke?

Thanks, Sheldon

4.600 x 4.500 x 6.800"

Thanks for the info, impressive build!

At what RPM does the AC compressor belt start to slip?  

looks like a torque monster.

cletus66 wrote:At what RPM does the AC compressor belt start to slip?  

How much belt dressing you got :-}?

Lem Evans wrote:

Considering the oil pressure....who can correctly guess the inches of Hg the vacuum pump was producing?

Freelander....you know about everything, how come you aint in on this?

Lem Evans wrote:

Lem Evans wrote:

Considering the oil pressure....who can correctly guess the inches of Hg the vacuum pump was producing?

Freelander....you know about everything, how come you aint in on this?

651?

Lem Evans wrote:

Considering the oil pressure....who can correctly guess the inches of Hg the vacuum pump was producing?

I'll take a stab in the dark and say it's a trick question and there was no vacuum pump.

You are right and wrong.......

It is only semi a trick question but it did have a pump on it.

OK, had pump but not hooked up.....ha ha. Nice engine! Hopefully my new pan going to help keep oil pressure like this one.

Here is a good read.....please read it all.

http://www.yellowbullet.com/forum/showthread.php?t=926370

Notice it's June of 2014

glenevans wrote:OK, had pump but not hooked up.....ha ha.   Nice engine!  Hopefully my new pan going to help keep oil pressure like this one.

Wrong!!

Some testing on smaller engines might prove interesting. The AFR 270 CC vs a few other heads. Look at page 3 of this thread. Westech dyno testing.

I’m going to go out on a limb hear and say I don’t think any of the castings have any advantage over each other as cast.

Imo who’s doing the porting and valve job on the castings (whether custom or out of the box) does dictate what you get, but ultimately once you get to the 400-410 cfm I’m not convinced gaining more airflow equates to more power or going faster.

I’m also starting to think the valve location on these low port heads does nothing but make a good show on the flow bench and does nothing to make things go faster either, if it is a gain it’s not big or may even go unnoticed, but same goes with the port entry shape be it square or round.

All this AFR voodoo is is a good marketing deal and an out of the box product that make life simple for bolt on guys, all the other quality heads, TFS, P-51, Eddy, BT, SCJ, A429 and even factory iron all have the same potential if you put the time in them.

Lem built a nice 598 and good to see people building Fords in sea of Chevys

dfree383 wrote:I’m going to go out on a limb hear and say I don’t think any of the castings have any advantage over each other as cast.

Imo who’s doing the porting and valve job on the castings (whether custom or out of the box)  does dictate what you get, but ultimately once you get to the 400-410 cfm I’m not convinced gaining more airflow equates to more power or going faster.

I’m also starting to think the valve location on these low port heads does nothing but make a good show on the flow bench and does nothing to make things go faster either, if it is a gain it’s not big or may even go unnoticed, but same goes with the port entry shape be it square or round.

All this AFR voodoo is is a good marketing deal and an out of the box product that make life simple for bolt on guys, all the other quality heads, TFS, P-51, Eddy, BT, SCJ, A429 and even factory iron all have the same potential if you put the time in them.

Lem built a nice 598 and good to see people building Fords in sea of Chevys

Lem said he has a new set of P-51's maybe they can run the cnc program on them and not do any hand work to them and slap them on the same long block for a test. CNC head vs CNC head.

Nice job Lem and Philip. Very nice job. Rick and the staff and AFR have a nice piece and you guys made it shine!!!

As a hobbyist "bolt-together-guy" I am very happy to have more head options. Competition improves the breed, or so they say.

1k hp is nice, but the 14.4:1 CR is a no-go for most of us street/strip guys. I would love to see how these stack up when coupled with a more friendly compression ratio.

BigBlockRanger wrote:As a hobbyist "bolt-together-guy" I am very happy to have more head options.  Competition improves the breed, or so they say.

1k hp is nice, but the 14.4:1 CR is a no-go for most of us street/strip guys.  I would love to see how these stack up when coupled with a more friendly compression ratio.  

I think Straub, Carl Hanson, Randy M, Scotty J, and others have built some pump gas engines using the AFR's with really good success.

BigBlockRanger wrote:As a hobbyist "bolt-together-guy" I am very happy to have more head options.  Competition improves the breed, or so they say.

1k hp is nice, but the 14.4:1 CR is a no-go for most of us street/strip guys.  I would love to see how these stack up when coupled with a more friendly compression ratio.  

I have an AFR 315 build in planning and collecting parts and I'm thinking of going E85 at about 13:1 or so. This will be for a street driven pulling truck.

BigBlockRanger wrote:As a hobbyist "bolt-together-guy" I am very happy to have more head options.  Competition improves the breed, or so they say.

1k hp is nice, but the 14.4:1 CR is a no-go for most of us street/strip guys.  I would love to see how these stack up when coupled with a more friendly compression ratio.  

Customer of mine in Winnipeg did a 531 back last year. It was right at 11.5 to 1 compression. It's posted on here. I think we were around 740HP

^^^^^Were you able to use 90-92 octane gas at 11.5 cr?

68formalGT wrote:^^^^^Were you able to use 90-92 octane gas at  11.5 cr?

Yes. I have asked the engine builder to send me the sheet on the engine.

68formalGT wrote:^^^^^Were you able to use 90-92 octane gas at  11.5 cr?

Apparently I am not allow to post an attachment. Can't post dyno sheet.

Here is the 521CID