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355 swap horsepower calculations

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355 swap horsepower calculations

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Old 10-08-2018, 08:27 PM
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355 swap horsepower calculations

Just finished my 355 build and was wondering how much power I would be makeing for my 91 camaro, any input is much appreciated
specs
350 bored 4.030
4 bolt main
10.5.1 compression
Blueprint h8002k
195 intake
75 exhaust
@.500=252 intake
@.500 =207 exhaust
2.02 valve intake
1.60 valve exhaust
64 cc chamber
Comps cam xr276hr
Duration 224/230
Lobe seperstion =110°
Intake centerline = 106°
Lift .502/.510
1.52 rocker arms
Holley stealth ram
Stock throttle body
2300 stall converter
What do y'all think this motor will be putting to the rear wheels ? And does anyone have any experience with the XR276HR cam?
Thank you
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Old 10-09-2018, 06:56 AM
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Re: 355 swap horsepower calculations

300-330 whp i would guess
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Old 10-09-2018, 09:34 AM
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Re: 355 swap horsepower calculations

With a perfect tune I would guess 320ish to the wheels assuming you get your deck height and valve train geometry perfect. More realistically 290ish
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Old 10-09-2018, 09:49 AM
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Re: 355 swap horsepower calculations

My goal was to reach around 400rwhp any ideas how I could achieve that goal?
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Old 10-09-2018, 09:52 AM
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Re: 355 swap horsepower calculations

Better head and alot more cam, port the stealth ram. Flowing 250 at .500 makes it harder. Something 270+ would be better

afr 195 is very good and something more like an xfi 280 hyd roller or a xe288hr

it may make more than 330 whp as it sits, but i am being conservative lol most dynos end up leaving you disappointed


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Old 10-09-2018, 09:53 AM
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Re: 355 swap horsepower calculations

Originally Posted by jonny_sanchez99 View Post
My goal was to reach around 400rwhp any ideas how I could achieve that goal?
Either much larger cam and more RPMs or less compression and more turbo
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Old 10-09-2018, 09:57 AM
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Re: 355 swap horsepower calculations

383 , afr 195 , xfi 292 , full exhaust and a good tune
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Old 10-09-2018, 10:08 AM
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Re: 355 swap horsepower calculations

350 30 over, 4 bolt, square decked, line honed.
Forged rotating assembly, balanced, 3.75 stroke, 6” rods
About 9.6-1 compression ratio
Comp Cams XR276HR, Duration 276/282, Lift .502/.510, 110 LS
AFR 195cc Heads, 64 cc, Scorpion 1.6 rockers
Airgap intake, Quick Fuel SS-735-VS carb
MSD 8365 dist, 16 initial @ 700, 34 all in @ 2500
THM350, Coan 2600-2800 stall, 3:08 posi, 28 inch tires

that made 352 whp. 383 with that cam

my 383 stealth ram afr 195 head and a custom 230 deg .600” hyd roller made 392 heat soaked on 10th pull lol. Auto lock up converter
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Old 10-09-2018, 04:40 PM
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Re: 355 swap horsepower calculations

If I would fully port the Holly stealth ram and also used 1.6 rocker arms what kind of gains would I see ? And I fully ported the heads aswell would it make a big difference?
Thank you everyone for your input much appreciated.
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Old 10-09-2018, 05:15 PM
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Re: 355 swap horsepower calculations

For 400 at the wheels you're going to need around 500 DEPENDABLY at the crank. Not "maybe", not "it might", not "with a great tune", not not not not not. 500 true actual proven measured real-world HP at the crank.

I'm not seein it happenin with the SR. That intake is usually good for around 425 - 440 CRANK HP on anything like a streetable combo. Experienced people can sometimes sqweeeeeezze a bit more out than that but it's not the kind of thing to bet on if the extent of your experience is reading Internet posts. Plus, the bottom end becomes a MAJOR consideration. "350 4-bolt main" with no further details shows how little thought, and budget, you've put into that part of it.

150 shot of nitrous would be the eeeeeeziest and most nearly certain way to get there. Don't bet on it lasting too many passes like that though.
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Old 10-09-2018, 05:35 PM
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Re: 355 swap horsepower calculations

The bottom end is all brand new Eagle specialty steel crank and new rods, pistons, and rings so the bottom end is all rebuilt to handle the extra power much appreciated for the help and input.
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Old 10-09-2018, 05:51 PM
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Re: 355 swap horsepower calculations

Originally Posted by jonny_sanchez99 View Post
If I would fully port the Holly stealth ram and also used 1.6 rocker arms what kind of gains would I see ? And I fully ported the heads aswell would it make a big difference?
Thank you everyone for your input much appreciated.
do you already have the heads? If so someone might be able to hand port them but i think you’ll need alot more cam either way

but if not save for something better. I like afr 195’s out the box for hyd rollers but there are some cheaper options out there
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Old 10-09-2018, 08:24 PM
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Re: 355 swap horsepower calculations

throw on a 100-150 wet nitrous shot for $900 and you will be where you hoped to be
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Old 10-09-2018, 10:15 PM
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Re: 355 swap horsepower calculations

Yes the whole motor is all assembled already.
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Old 10-09-2018, 10:35 PM
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Re: 355 swap horsepower calculations

The motor is built, you’re better just maximizing its potential. Spend on other things to make the car faster...Lower gears, street slicks, suspension, long tube headers, true dual exhaust, underdrive pulleys, etc
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Old 10-10-2018, 07:36 AM
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Re: 355 swap horsepower calculations

almost the set up im running just bigger injectors an bigger throttle body an lil different cam that im using 345 hp
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Old 10-10-2018, 07:57 PM
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Re: 355 swap horsepower calculations

I agree that you need better heads and a higher duration cam to hit 400whp all day long. But honestly I don't think you'll be disappointed with mid 300'x to the wheel.

Honestly you might be more disappointed with it actually. The greatest and worst thing about a relatively high overlap camshaft is they love to Rev. They are generally ornery and sluggish at street speeds (think residential 25mph roads) and simply amazing when you can finally open the taps.

They usually put the power curve too far out of the fun zone on the street.

I honestly dislike driving the car even semi-daily. I hate being stuck in traffic or at stop n' go lights. Unless I have clear highway ahead of me I don't want to be behind the wheel. I constantly find myself looking at 383 and 396 short-block packages to bring the power curve down.
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