AFR BBC Heads
#1
Registered
Thread Starter
![Default](/forums/images/icons/icon1.gif)
Anybody have experience with these heads? They claim 175 HP over stock GM Iron heads. They don't say what stock GM head they are comparing against.
#5
Registered
![Default](/forums/images/icons/icon1.gif)
The Afr Is A Quality Piece For The Price But Also One Of The Best Working Conventional Heads Out There. As Far As The Power Gains Every Engine Is Different.
#6
Platinum Member
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
![Default](/forums/images/icons/icon1.gif)
We run AFR CNC ported heads on our 97 Merc 600SC ,roller 509CI TopGun motors,now an easy 800hp+ @ 5800rpms, only 6lb of boost..
I think the CNC ported AFR's are a good choice right out of the box!
1997 -10,500 lbs TopGun 94 mph gps. We gained 12mph over stock motors with the addition of AFR heads and of course other well matched components.
I think the CNC ported AFR's are a good choice right out of the box!
1997 -10,500 lbs TopGun 94 mph gps. We gained 12mph over stock motors with the addition of AFR heads and of course other well matched components.
#9
Where To
![](https://www.offshoreonly.com/forums/images/icons/prop.gif)
Join Date: Nov 2001
Location: Alexandria Bay, NY 1000 Islands
Posts: 2,517
Likes: 0
Received 3 Likes
on
3 Posts
![Default](/forums/images/icons/icon1.gif)
boatn70 was referring to me. Depending on what you are looking for, I just completed dyno running my HP500's with new 315cc CNC'd AFR's. I'd be more then happy to fill you in.
Dave
Dave
__________________
Air, Sea, and Land...Exploring the planet in 3-D!
Air, Sea, and Land...Exploring the planet in 3-D!
#10
I hate the winter!!
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Join Date: Jul 2001
Location: long island, new york
Posts: 2,707
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
I have a set of AFR 315 cnc on my NA 540. No problems to report, the best thing is they made good power through out all rpms.