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Old 09-18-2006, 02:04 PM
Redman Racing
 
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AFR's 195cc Powerband

I am focusing on bumping up the power of my SBC by stroking it . Now I wouldn't think that the heads that I have mentioned above would have a problem making power with a 383 in the 7000-7100 area but I was wondering about what you guys think of it????

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Old 09-18-2006, 02:36 PM
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To get the real info go to AIRFLOWRESEARCH.com, They have a bunch of dyno tests covering a 383 with the 195 heads. They are making big power around 5500 -6000 rpm. Why do you want to spin that tight??
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Old 09-18-2006, 03:02 PM
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Quote:
Originally Posted by 327NUT
Why do you want to spin that tight??
Not trying to build a street and strip motor this time
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Old 09-18-2006, 03:15 PM
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Depends on the lift of the cam.

As a general rule, 250cfm ports are good for 500hp on a V8 and 200cfm is good for 400hp.

Check out the flow numbers of the head at the max lift of your cam, then multiply by two and compare that to the max hp you are expecting to make. That should give you some idea.
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Old 09-18-2006, 03:33 PM
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The head is not going to be the restriction. The restriction will be the intake and the camshaft. You not going to do it with a Performer RPM intake, you'll need a Victor or Super Vic. Your also not going to do it with a solid roller in the 240 @ .050 range, your going to need at least 250+ @ .050.
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Old 09-18-2006, 03:33 PM
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You may be hard pressed to get the max power to come in at 7000 RPM using the 195's on a 383. Although those are a great head, it is still important to match all of the parts. Running a huge cam in an attempt to increaase the maximum RPM that the motor makes hp will probably not be the best route to take. The AFR 195's are recommended for ~2000-6500, but that is a rather loose recommendation considering that they will probably want to perform at a higher RPM than that on a 327 and a lower RPM on a 406. Below is a 383 with a cam that is recommended for 2500-6500 RPM. The motor peaks at around 6500 RPM. The amount of RPM that the motor is going to be able to support is going to be effected by the size of the runner of the head. You could probably go one step larger on the cam than they did in this article (to something like the xs290s, 252 260 @.050 .540 .558 lift), but too much more than that, and I think you will start to have a missmatched combination. If you had the money to go with a solid roller, I would recommed the xr286r, (248 254 @.050 .576 .582 lift) along with a victor JR. But I would have at least 10.5:1 compression. I could be wrong about this; calling AFR may be a good idea to get some insight from them.


http://airflowresearch.com/articles/article085/A-P1.htm

Adam
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Old 09-18-2006, 05:26 PM
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We built a 383 for a customer on T/C site and we used the AFR/s and so far the customer is very happy with the Dyno results and the way it drives and here is a link on that engine http://www.chevelles.com/forums/show...highlight=DYNO

We have built some 383's using the GM 906 casting Vortec heads that have been worked and both engines have Dynoed about the same the big differance is that the AFR's are a lot lighter but more money

But on the engine with AFR's we could have gone with a solid or hydraulic roler and seen better numbers but for a daily driver this engine is more then enough with 501 foot pounds of torque.
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Old 09-18-2006, 11:05 PM
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Quote:
Originally Posted by Rick WI
The head is not going to be the restriction. The restriction will be the intake and the camshaft. You not going to do it with a Performer RPM intake, you'll need a Victor or Super Vic. Your also not going to do it with a solid roller in the 240 @ .050 range, your going to need at least 250+ @ .050.

agreed I was already looking at the different single plane manifolds out there.

Edelbrock,merlin,holley, I kind of like the world products motown????? low end is not a concern since I plan on a Torque conv stall in the powerband. Don't plan on doing honestly any driving on the streets.
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Old 09-18-2006, 11:41 PM
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The World Products would be a good choice, much nicer plenum size versus the standar Victor.
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Old 10-13-2006, 10:09 PM
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Well I started this post a little bit ago and do to money I am just going to do a cam swap. Now Afr says that there springs will handle .550 lift. The cam that is in there is a xe284h .507 .510 lift. The cam that I have my eyes set on is the xs290s .540 .558. lift. After talking to compcams they assured me that the .550 lift rating that afr gives is a touch smaller than what you can actually use. What he said is that there is usually a .016 allowance or something like that. I was wondering what your thoughts where, does this sound right? Myself doesn't think that a .008 over the recommended max will be a problem at all. In any case all proper clearances will be checked.
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