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How much HP do you think I have?

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Old 11-13-2015, 09:30 AM
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Car: 1986 IROC-Z
Engine: 305
Transmission: Auto
How much HP do you think I have?

I know it's hard to guess, but surely someone has a similar setup to give me an approximate number?

I'm looking at trading for a 92 RS next week. Here's the specs, I was wondering if you guys had a guess on the HP it might have...

305 block
IROC 350 heads/intake
Edelbrock open element a/c
Holley carb
new valves/roller rockers
aftermarket headers
aftermarket dual exhaust

PS>where and how much does it cost to get your car on a dyno? Never tried that before
Old 11-13-2015, 10:30 AM
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Car: 00 SSEi / 94 C4
Engine: 231 / 383
Transmission: 4T65E / ZF 6sp
Axle/Gears: 2.93 / Dana 44 3:45
Re: How much HP do you think I have?

it's a open question. Mileage?? You need the Intake & carb "swap" Part numbers. Possibly other Parts. you are not aware of. Unknown tune..
Stock was about 170HP you now have slightly bigger valves. Face value. Plus OR Minus 30ish HP

do a online search for your area. you should find plenty of tune/Dyno shops. Roughly
$180.00 for a dyno pull

Last edited by 88gta3508; 11-13-2015 at 10:33 AM.
Old 11-13-2015, 10:34 AM
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Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: How much HP do you think I have?

You dont mention cam or what 305 it started life as. Maybe 130-150 whp?
Old 11-13-2015, 11:04 AM
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Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
Re: How much HP do you think I have?

350 heads on a 305 block? Your compression is probably crap.

You are probably making less power than when it was stock.
Old 11-13-2015, 11:22 AM
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Car: 1992 Camaro Z28
Engine: L98
Transmission: 700R4
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Re: How much HP do you think I have?

350 heads with a carbureted IROC intake? So an LG4 intake with lower compression? I'd say 150 whp, depending on condition.
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