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Old 02-25-2003, 10:45 PM
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Post AFR heads?

i read on another post (the $7k to build a motor) and saw that someone was talking about the 190cc or 195cc heads that by Airflow research makes. i have stock chevy 194(cc?) heads that are ported/gasket matched and was wondering if i got those AFR heads would it be a bigger improvement in power? im no expert on heads so what exactly is the 190-95 CC mean? anything else you guys can add about heads would be wonderful. someone once told me that Heads are basically the part on the engine that will get you the most power because of how good they flow. so thanks in advance. later

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Old 02-26-2003, 03:25 AM
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The AFR heads are very popular right now. I have some for my 331 stroker project.

Here is their site: www.airflowresearch.com
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Old 02-26-2003, 03:58 AM
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195cc refers to the volume of the intake runner. The "194" in the case of your stock heads refers to the intake valve size; their intake runner is probably more like 160-165cc. You'd definitely see more power with the AFR heads, but you might want to consider going with a different size intake runner depending on your engine and its application.
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Old 02-26-2003, 01:34 PM
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afr's are awesome heads. 195'a are a bit better but the flow #'s are really close to the 190cc's.for a street motor these will rock and they are plenty for a race motor unless your planning on turning 7000rpm.then 215's or 220's are in.i run afr195's on my 400sbc.they are hot and worth every penny. <img src="graemlins/pimp.gif" border="0" alt="[pimp]" />
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Old 02-26-2003, 01:41 PM
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hey guys thanks a lot for the information. i have been looking at there webiste and thinking about getting them. do you think i would notice a big increase of power on what i have now? even though my heads are ported? what increase in CC would i be getting? somewhere around 35cc's? that is according to what the other post said, saying my chevy heads probably have 160-165cc runners. thanks again. later
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Old 02-26-2003, 01:42 PM
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uh disregard the 2nd question asking how many cc's i will be increasing for the runner size. i forgot how simple math was and that i just had to subtract the other runners from the new.............ok sorry. later
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Old 02-26-2003, 01:58 PM
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The AFR's are a nice head. But you could look into the trickflow 195, canfield 195, pro 1 200, pro topline 200 and theyre all conciderably less money plus your going to get the same performance out of them, the only AFR head that impresses me is the 210 {probably too big for your combo}, it has great low lift flow numbers and outstanding high lift numbers. Nothing wrong with the AFR's at all but the others are much cheaper.
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Old 02-27-2003, 06:43 AM
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if your just looking for more power in your motor go with the cheeper head and spend the rest on a cam or intake but if u realy want to go for it buy the afr 190 or 195 head there the same head 195 will raise the rpm curve up a little.the afr head out performs any one of those heads by alot .i had a set of rpm heads that i changed out with the 195 and gained 50hp with just the heads
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Old 02-27-2003, 01:47 PM
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just remember that smaller motors (327-350)like the smaller runners(170-195).so look at the difference in flow #'s with different brands based on the same runner size.afr doesn't recommend their 180cc for some reason.don't know why but the rep i talked to didn't like them.edelbrock performer rpm's are great for a 350 and they are priced right for the performance.summit racing ran a special on them this past fall for $750.00 not bad
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Old 02-27-2003, 02:27 PM
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cornele i have to disagree, the afr's may flow SLIGHTLY better than the canfields or the TFS but concidering the things are CNC ported i hope they should. But if you bought some canfields put the difference in money in porting youde probably have a supirior head with the canfield or TFS.
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Old 07-19-2004, 08:09 PM
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It is true that other heads will be cheaper and may flow as good as AFR heads when ported but think about this. You can buy the heads from AFR ported with the valve and spring on. Most other heads you will get cheaper commonly a lot but unless you can do all work you must think these other heads will have to be taken to someone who can port them and it has to be a very good jump and even then you can not be sure how they will flow till after they are done. With AFR you get them ready and you know what they produce. Other heads you must port and then install everything you need this could easily out weigh the cost of buying the AFR. Thats just something to think about...
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Old 07-19-2004, 08:59 PM
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As with any aftermarket head, don't just take them out of the box and bolt them on. Take them to a good machine shop and have them checked out. I have a set of AFR SB Ford heads in the shop right now. They are warped .008" , the valve guides are too tight, and the valve seats are only contacting the outer .020" of the valve face, leaving another .015" to .020" not even contacting the valve (running off the outer edge of the valve).

The head design and CNC ports chambers are great, but the actual valve job leaves a lot to be improved upon. The warpage is about average for aluminum heads, and would not seal compression effectively for very long.

I have worked on heads like these that were bolted on and ran. The all have exhibited valve leakage and gasket leakage (both coolant and compression). Fix the heads before you bolt them on and you can leave them on a lot longer than you would otherwise.

I find this state of affairs pretty much the same with almost all of the "out-of-the-box" heads.

tom
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Old 07-19-2004, 09:05 PM
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Quote:
Originally posted by nickel333
cornele i have to disagree, the afr's may flow SLIGHTLY better than the canfields or the TFS but concidering the things are CNC ported i hope they should. But if you bought some canfields put the difference in money in porting youde probably have a supirior head with the canfield or TFS.
I like Canfields heads as much as AFR's, Canfield has a fine cnc porting profile of they're own. They have very similar flow numbers when fully cnc ported as AFR heads are.

You will not find anyone willing to port any as cast head, like Trick Flows, to flow more air than AFR or Canfield heads for less than $1500+.

I know this because I've tried to do it myself. I started porting heads for others until I had enough money to buy a used flow bench and quantify the results of the work that I do. I haven't learned all the secrets yet. My finished product is far behind what more experienced people have gotten from similar castings.

It usually takes around 100 hours of work to hand port new heads unless I've done the same castings several times. Then it's still around 75 hours or so. Time consuming and expensive.

Needless to say I don't do much work for others because it's so expensive for them and time consuming for me. They can get better flowing heads for the same or less money from AFR, Canfield, and a host of others. Quicker too.

Larry
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Old 07-19-2004, 09:06 PM
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Of course you must admit that having much of the port job done already is a very large + for most people. Time wise it matters a lot if heads are ported to start. Another problem of course being finding a good shop springs and valves are one thing porting (and I don't mean min. porting but full port jobs) take time adn money. If I had to choose to have a valve job or that and a porting I would go for just the valve I mean when working on something important as heads the more work done to them only runs the risk of getting something wrong unless of course it is a very good shop and even then mistakes do happen.
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Old 07-19-2004, 09:46 PM
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I have bolted on a set of AFR 195 on my SBC 400 and was very impress with the performance on the dyno and the little driving that I have done since putting the engine in the car this past week. You can really feel the seat in the pants power and hopefully I will be able to get a few rounds at the track if I could convince them to let my car as a hardtop convertible. Convertible require a roll gage that I don't wont on my street rod...

Now I totally agree with Machine Shop Tom about going through your heads before bolting them on. I found all type of metal shaving in my heads and the installed height was not correct. Since I have to cange out the spring for my cam I really did not bother me that much. You should take them apart and check everything twice and clean them yourself.

Take a look at the buildup and dyno that was done on my motor:
Make sure you select " Normal Size" to view the dyno sheets...

SBC 400
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