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Old 01-29-2013, 10:26 AM   #1
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AFR heads

Well I've made up my mind that AFR has the proven gains I want but I still have questions for you engine building guys. I am aware that the 165cc heads will probably clear the valves on a stock cam but what about the 185s? I ask this because I honestly don't want to have to check clearance with clay then have to clean pistons. I just want to bolt on and go. I believe AFR recommends not using a cam with over .500 lift? Also on stock bottom end and stock cam, what would the 185ccs with 58cc combustion chambers raise the compression to approximately? I'd like to be upwards of 10.5:1. Anyone and everyone weigh in on this if you'd like to. Thanks
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Old 01-29-2013, 10:59 AM   #2
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My freind has the 165 cc on his fox with a small cam and there was a huge difference over the trick flows he used to have
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Old 01-29-2013, 11:17 AM   #3
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Originally Posted by 2300turboford View Post
My freind has the 165 cc on his fox with a small cam and there was a huge difference over the trick flows he used to have
So your saying the difference was better as in the AFRs were better?
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Old 01-29-2013, 11:29 AM   #4
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Quote:
Originally Posted by Ewokjax95 View Post

So your saying the difference was better as in the AFRs were better?
Yes I am a full believer in afr heads u won't be sorry well worth the money !!
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Old 01-29-2013, 11:38 AM   #5
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Yep. That's what I've been told but I'm just trying to be cautious. I'd hate to pay 1500$ for them and find out I need fly-cut pistons. It is my dd after all. I suppose I should do a little more research.
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Old 01-29-2013, 12:13 PM   #6
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From my research the trickflow 170s flow like the afr 180, just with a shorter runner due to the twisted wedge design. It also makes the trickflows much friendlier with larger cams on stock pistons
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Old 01-29-2013, 12:34 PM   #7
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Trickflow/afr is one of those never ending debates. You can read a million threads about which ones are better. They are both great heads and you will be happy with either.

But to answer the op question. 185s has less valve clearance then the 165s. I believe the product information says "requires special pistons". But for a mild 302 build 165s are a great head. You wouldn't see much gain with a small cam and stock stroke going with the 185s over the 165s.
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Old 01-29-2013, 12:35 PM   #8
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Originally Posted by keaton5.0
From my research the trickflow 170s flow like the afr 180, just with a shorter runner due to the twisted wedge design. It also makes the trickflows much friendlier with larger cams on stock pistons
Yup, that's what I came up with to. .
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Old 01-29-2013, 05:28 PM   #9
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It claims 95 hp gain over gt40x heads
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Old 01-29-2013, 07:42 PM   #10
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Also, the compression ratio should not change considering your stock heads are also 58cc.
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Old 02-01-2013, 07:03 AM   #11
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Go Edelbrock RPM Heads lol!!
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Old 02-01-2013, 07:37 AM   #12
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I think if you match the cam up better with a set of trick flow heads I have a lot of friends with 170 track heats going 11.6 with stock bottom end and 5 speed, which head you want is a personal preference flow numbers aren't everything it's about the velocity the that makes the power also. But trick flow and afr are both great company's can't go wrong
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Gt40x heads,e 303 cam, Ford racing 1.6 roller rockers, cobra upper and lower intake, ram air intake, c&l bigger maf, 30lb injectors, Bbk fuel Pressure regulator, double roller timing chain,Bbk shorty headers & h-pipe,flowmasters cat back,chipped,t-5 swap king cobra clutch, 4.10 gears.
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Old 02-02-2013, 10:44 AM   #13
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Well i have the afr 165s with a custom cam with a 590 lift no Clearence issue with stock bottom end i love my afr heads
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Old 02-02-2013, 02:03 PM   #14
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Quote:
Originally Posted by captain78
Well i have the afr 165s with a custom cam with a 590 lift no Clearence issue with stock bottom end i love my afr heads
Duration is what causes piston to valve clearance
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Old 02-02-2013, 05:15 PM   #15
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Duration is what causes piston to valve clearance
What's the Highest duration Afrs can run then? Do you know?
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Old 02-02-2013, 06:42 PM   #16
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Originally Posted by The420fox

What's the Highest duration Afrs can run then? Do you know?
There no set amount. Every motor is different and there is way to many variables. Even if you were to call afr themselves they would tell you to check piston to valve clearance.

The area most likely to have clearance can be any where from -20* to +20* from tdc.
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Old 02-02-2013, 06:44 PM   #17
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There no set amount. Every motor is different and there is way to many variables. Even if you were to call afr themselves they would tell you to check piston to valve clearance.
Thanks dreamstang
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Old 02-02-2013, 06:44 PM   #18
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Originally Posted by The420fox

Thanks dreamstang
Your welcome. And I added a bit to my last post.
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