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Old 07-21-2006, 11:51 PM
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Still waiting on AFR heads

I purchased a set of 2006 castings of AFR's 195 comps for my SBC 355 back in Feb 2006. I called today and they are still a few months out from production. So started thinking about switching my SBC order to a BBC order. I have always wanted to build a big block for my six six Impala. I already payed in full for the Comp 195's. So for a few more hundred dollars I can get a good set of big block heads.

So this leads me to my questions:

I want to build a 502 block with numbers around 600 HP and 600 Torque. My car will only be driven on the street. But I want neck snapping, off the line power. BIG lopey cam (.650 or larger lift) and 11.5 compression.

I am currently running:

SBC 355
Comp Roller cam with 245@50 with .600 of lift intake/exhaust
Torker II Intake
Camel Hump 2.02's
KB Pistons 11.2 compression with 64 cc heads
Mighty Demon 750
Yank 3800 stall converter
4.11 rear gears with posi

With the AFR Comp 195's I figured I would be in the 475-500 HP range with my 355. So I want to shoot for 600 plus on the 502

Here is how my current SBC sounds.... http://www.airriderz.com/HAN.wmv

I have noticed that Dart sells a rotating 502 assembly up to 700 HP for $2500. Would a rotating assembly be a good choice?

I have never owned a big block. So I can only compare my SBC to how I like things. I want a cam with the same pop and lopey idle as my Comp Roller Cam I have now. But more pop would even be better. And I have no detonation with 11.2 compression at my altitude of 4800 feet in Reno, Nevada. So will I be able to get away with the same amount of compression on the big block? Any and all thoughts are appreciated on how I should set the big block up.......

Dave

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Old 07-22-2006, 07:34 AM
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big block all day long

hi dave,
looking at your car and the freedom from an abundace of accessories;i'd say go for the big block.as for the set up;big block vs small block is night and day.11.5 to compression is not very pump gas friendly on the street with a big block even with aluminum heads.drop it down a point.you can keep the camshaft specs close to the same duration @ .050 and you pick up a ton of
torque and still keep that sweet stumble at idle.
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Old 07-22-2006, 10:25 AM
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I think that would be a good idea. If you went with a set of the fully ported 315cc heads, and a roller cam around ~250 @.050 I think you would actually be closer to 700 hp. I would try to stick to around 11:1 max. You may be able to get away with more, but I would not chance it. Just make sure your quench is correct. Below is a 512 with the 315cc heads and a 256 260 @.050 solid roller cam that made 741 hp with pump gas compression. I figure that with the same setup but a hyd roller you should still be at 700.

512 afr 315cc 741 hp @6500 RPM pump gas
http://airflowresearch.com/articles/article052/A-P1.htm

quench explained (if you didnt know)
http://www.chevyhiperformance.com/techarticles/94138/


Adam
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Old 07-22-2006, 06:56 PM
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big block

Thanks for the replys guys. So my cam specs for my small block will work good for the big block? Im sure it will pound the ground a little better in a 502
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Old 07-23-2006, 07:21 PM
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The cams would be close. You would be able to get away with more cam on the big block because it is more like a stroker, along the lines of a 496 compared to a 454. The extra cubes will bring the powerband down from the stated RPM range. A 2500 to 6500 cam in a 355 will probably run best in that stated range. A 2500 to 6500 cam in the 502 will probably act best in a roughly 2000-6000 range. A good example is the 512 in the article above that has the 315cc heads and a cam rated for 3200-7200 RPM that made its max power at 6500 RPM.

Adam
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