What's wrong with AFR's exhaust port?
03-06-2015 | 03:57 PM
#141
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Joined: Apr 2004
Posts: 1,268
Likes: 239
From: Michigan
That seems a little tight for a marine supercharged setup esp running cool water temps . inconel valves are great but they still need a wide seat to aid in cooling the valve .
My next set of heads I will be buying bare and having my head guy assemble them, check guide clearances, check valve job ...
My next set of heads I will be buying bare and having my head guy assemble them, check guide clearances, check valve job ...
03-06-2015 | 05:27 PM
#142
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Joined: Jun 2009
Posts: 9,966
Likes: 6,453
From: Chicago
Although they say nothing about seat widths they do mention vgc in the literature as follows : Our typical valve guide clearances are .0013 - .0016 . In some severe applications ( nitrous , marine endurance racing or blower usage ) looser guides might be required . Check with your engine builder .
Why settle for less? Bob Teague spent some time at the ARF factory and helped develop a program for what we like to call a true HIGH PERFORMANCE CNC MARINE HEAD.
All the heads in stock are madewith 3/8 exhuast valves instead of 11/32 because we think that the thicker valve stem is much stronger especialy for the punishing heat and rpm most high performance motors make.
With this CNC program you get THICKER VALVE SEAT WIDTHS for more surface area to transfer heat.
A chamber of 124cc instead of 121cc, the bigger chamber drops static compression so you can run more boost and the custom chamber design also picks up exhuast flow to make more power on blower motors.
So as you can see by some of the things we do different on our CUSTOM CNC AFR HEADS from the AFR heads you can buy somewhere else you not only get a much stronger set of heads but a more POWERFULL set of HEADS.
These are the same heads that we use on every motor we build and they are available to you. Why settle for less ? There is no reason, just buy the best...........
I have them in stock
All the heads in stock are madewith 3/8 exhuast valves instead of 11/32 because we think that the thicker valve stem is much stronger especialy for the punishing heat and rpm most high performance motors make.
With this CNC program you get THICKER VALVE SEAT WIDTHS for more surface area to transfer heat.
A chamber of 124cc instead of 121cc, the bigger chamber drops static compression so you can run more boost and the custom chamber design also picks up exhuast flow to make more power on blower motors.
So as you can see by some of the things we do different on our CUSTOM CNC AFR HEADS from the AFR heads you can buy somewhere else you not only get a much stronger set of heads but a more POWERFULL set of HEADS.
These are the same heads that we use on every motor we build and they are available to you. Why settle for less ? There is no reason, just buy the best...........
I have them in stock
http://www.offshoreonly.com/forums/n...ine-heads.html
03-06-2015 | 06:22 PM
#143
Registered
Joined: Oct 2000
Posts: 4,541
Likes: 107
From: Western Michigan
Although they say nothing about seat widths they do mention vgc in the literature as follows : Our typical valve guide clearances are .0013 - .0016 . In some severe applications ( nitrous , marine endurance racing or blower usage ) looser guides might be required . Check with your engine builder .
