Afr Heads on sbc 327...180 or 195s????? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-15-2012, 03:49 PM
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Afr Heads on sbc 327...180 or 195s?????

I currently have a 327 which i am going to run a comp cams xe284 cam, holley 750 carb, 3200 stall, and 4.10 gears. Im racing the 1/8 mile drags. Im looking into a set of afr heads but cant decide on the 180s or the 195s. I talked with afr and they suggested going with the 180s. My only fear is that the 180s ideal rpm range is up to 5500 and im going to wind mine up to 6500 which the 195s match better...any suggestions?

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Old 01-15-2012, 03:57 PM
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for 1/8 mile, Better off 180. You will need all the troque you can get for a short distance.
hope this helps
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Old 01-15-2012, 04:07 PM
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will the 180s still pull past at the rated rpms at 5500? thats my main fear
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Old 01-15-2012, 04:10 PM
How fast is fast enough?
 
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if you're racing don't even consider the 180s. torque will never win a race.
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Old 01-15-2012, 04:17 PM
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so are the 195s my best bet?
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Old 01-15-2012, 04:23 PM
How fast is fast enough?
 
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there's no question about it. 180s will peak at 5500 rpm or a little higher if that's what you want. if you plan on going to 6500+ rpm then you'll want the 195s.
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Old 01-15-2012, 04:26 PM
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Your probably right...last season i ran a little bit different setup but with a set of heads with 1.94 valves that pretty much peaked about 55-5600 and that motor needs to run 6500 + to get good racing potential out of it
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Old 01-15-2012, 04:48 PM
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Rock the 195's and don't look back. The 180's might perform better right out of the hole, but you have a 3200rpm stall so who gives a s**t about off-idle performance. You want to race the car but you run a puny cam. Why is that?
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Old 01-15-2012, 04:52 PM
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Comp cams suggested a smaller one actually, and the rpm on that cam is 2300-6500, thought about going the next step up which would be 2800-7000 but i doubt i would make enough vacuum to support my power brakes. thats one reason for a bit smaller cam.
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Old 01-15-2012, 05:06 PM
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Quote:
Originally Posted by tobeyw86
I talked with afr and they suggested going with the 180s.
hmmmmmm.......
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Old 01-15-2012, 05:07 PM
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and anyone have a suggestion on 65cc vs 75cc combustion chamber?
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Old 01-15-2012, 05:40 PM
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Find it kind of interesting that you will listen to Comp when it comes to cam recommendation but you won't listen to AFR when it comes to intake port size.
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Old 01-15-2012, 05:41 PM
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Whatever gets you the most compression lol, so obviously the 65cc. I take that back about the puny cam, I just googled it and it's pretty stout. Here's a chart with some dyno numbers on a slightly bored 350 engine.

http://www.google.com/url?sa=t&rct=j...IN7QhCn5IPXDRg

The AFR 195 heads will stomp those sportsman II's so you've got the advantage there. They flow an honest 30cfm more. You'd probably be making a touch over 400hp but you'd be peaking at 6300 or so, not the 5800 like that 350 did.
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Old 01-15-2012, 05:45 PM
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Quote:
Originally Posted by tobeyw86
Comp cams suggested a smaller one actually, and the rpm on that cam is 2300-6500, thought about going the next step up which would be 2800-7000 but i doubt i would make enough vacuum to support my power brakes. thats one reason for a bit smaller cam.
Vacuum for power brakes? My cam is 256/260 on a 105 with almost .700" lift. My brakes work just fine. Push the pedal harder to stop sooner, lol. It's not like the pedal will suddenly go to the floor. Tons of drag cars switch to manual brakes to save weight and they have no problem stopping from 130+mph.
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Old 01-15-2012, 06:59 PM
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Yeah i think that cam might work alright for what im wanting out of that engine anyways...I am def starting to lean more towards the 195s now though.
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