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Old 02-10-2004, 04:49 PM
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Got a SBC question for you guys (like we dont have enough)

alright guys i know i need to invest in a desktop dyno but can one of you guys run this one for me on my street/strip buildup, first off 69 4 bolt main 350 block, hot tanked magnafluxed new freeze plugs .040 over, main and rod bearings are standard size, connecting rods are eagle brand SIR rods 5.7 length, pistons are speed pro power forged pistons 10.2:1 compression flat top with 64 cc chamber heads, heads are edelbrock victor jr. 64cc chamber 2.08 intake valve, 1.6 exhaust intake runners are 215 (i know thats a little large for what im doing but i got these heads for cheap) .100 raised exhaust ports, victor jr intake manifold, carter 750 cfm carb, GM performance HEI ignition wtih 8 mm plug wires, camshaft is a comp cams grind # 292, Advertised duration: 292 intake/292 exhaust, Duration at .050 in. cam lift: 244 intake/244 exhaust, Gross valve lift: .501 in. intake/.501 in. exhaust, Lobe separation: 110 degrees, comp cams matched lifters, pushrods, valve springs locks and retainers, comp cams double roller timing set, comp cams roller rockers 1.6 ratio, dynomax headers

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Old 02-10-2004, 06:18 PM
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I would say you would be around 450 plus.


mike
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Old 02-10-2004, 07:28 PM
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on ryans page he has your heads on a roller cammed, 406 efi motor and it makes 460 horse. Given that you're down about 50 cubes, I would say btw 415-425.

K
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Old 02-10-2004, 09:33 PM
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sounds like a good build, guy. just wondering what you've got for trans and rear gears. i know from personal use that the 292/292 is a fairly lopey cam, and really likes man. trans, and steep gears.
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Old 02-10-2004, 09:36 PM
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check the duration on that one im getting some really low torque figures for that. also did you take into consideration that the lift will be higher with the 1.6 ratio? just asking.
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Old 02-11-2004, 08:15 PM
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Whats up guys, im going to be running a B&M 10 inch converter 3,000 stall, built 350 turbo with 4.10 posi rear end
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Old 02-11-2004, 09:25 PM
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sounds good, i'd say 430-435 hp. those 4.10's should help with the weaker bottom end of that grind. just a possible heads up, but if this is for street use, vacuum stuff like brake boosters, ect may suffer from lack of in/hg.
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Old 02-13-2004, 03:57 PM
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thanks for brining that up, i am going to use those 4.10's like you said to help the low end torque, and i intend to use a vaccum canister for my power brakes
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Old 02-13-2004, 06:49 PM
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I finally purchaced the Desktop Dyno '03, I am getting use to it but I ran your specs and here's what I got:
RPM: HP: Torque:
2500 154.869659 325.226288
3000 200.182419 350.319244
3500 255.192459 382.788696
4000 312.654724 410.359314
4500 365.511658 426.430267
5000 411.672150 432.255768
5500 438.301514 418.378723
6000 450.558319 394.238525
6500 449.976044 363.442200
7000 423.447357 317.585510
7500 401.916107 281.341278
8000 369.301361 242.354019
8500 315.634552 194.950760
9000 266.745636 155.601624
9500 210.721909 116.451584
10000 155.075607 81.414696
It might be hard to read.. didn't copy and paste too well.
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Old 02-14-2004, 08:39 PM
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In an ideal world Desktop Dyno would be accurate. Unfortunately it assumes perfect ignition. Spot on timing with an ideal advance curve. A perfectly tuned and operating carburetor etc.... That's about a 100 HP margin of error. Don't believe me go to the shop nearest you that has a chassis dyno.
Those heads and intake are a bit much unless you plan on staying above 4000 most of the time and I bet that engine will fall on it's face anywhere below 3000 but, the gears will help compensate. 350's usually like 180-190 CC ports. Go bigger and you sacrifice midrange for a peak number you may rarely use, especially on the street. I like the cam though, works good in light vehicles.
Good luck with it, Joe
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