355 sbc Horsepower estimate - Chevelle Tech
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post #1 of 38 (permalink) Unread Jan 8th, 20, 7:55 PM Thread Starter
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Gary
 
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355 sbc Horsepower estimate

Just what to know what you guys think of this 355 build.. Hoping it gets sons car to 7.30's to possible 7.20's in the 1/8 mile.. I think it might make 450 to no more than 500..

350 sbc .30 over
JE flat top pistons 2v reliefs
Sealed power file fit rings
6" Scat rods
GM stock crank
Brodix IK 200 heads ( no extra porting )
Victor Jr. copy intake not real sure of the brand
650 double pumper Proform main body ( may need a 750 )
1"5/8 Headman headers
Howards hydraulic roller
.550/.540 .247/.253 @.050 ground on 110

Car should weigh about 3500, it has a 700r4 with a FTI 4000 stall, Moser 9" with 4:56 gears.. thanks, Gary

1955 Chevy
496 bbc
best 60' 1.36
best ET 6.23
best MPH 110.67
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post #2 of 38 (permalink) Unread Jan 8th, 20, 9:01 PM
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MARK
 
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Re: 355 sbc Horsepower estimate

454 HP = 119 MPH @ 3500 pounds. 119 MPH / 1320=11.09. 1.57 X 7.10 = 11.14. So there you have it. So....now it comes down to the drive line, can it do it, I don't think so, but please keep us informed.

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post #3 of 38 (permalink) Unread Jan 9th, 20, 12:13 AM
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Re: 355 sbc Horsepower estimate

My 9 to 1 358 with Home ported Sportsman II heads, 300-25 Strip Dominator, 850 Mighty Demon 1 3/4 Super comps went 7.24 last outing a couple of years ago
so you should be able to do it.
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post #4 of 38 (permalink) Unread Jan 9th, 20, 9:04 AM
 
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Re: 355 sbc Horsepower estimate

I could imagine 7.30's out of that if everything is working as it should.

But it's going to take a very low density altitude to get there. During the summer heat I'd say 7.50s would be more realistic.
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post #5 of 38 (permalink) Unread Jan 9th, 20, 9:07 AM
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Re: 355 sbc Horsepower estimate

I think you'll be close. We had a 355 in my friends 69 camaro. The car looked factory original except for the wheels and tires. 2 valve relief flat tops, World Sportsman II heads, Ultradyne 251/251 solid flat tappet, .518/.530 cam. T-400 with a 4400 converter and 4.56 gears. The car went 11.58 at 115 mph.
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post #6 of 38 (permalink) Unread Jan 9th, 20, 11:04 AM Thread Starter
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Gary
 
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Re: 355 sbc Horsepower estimate

Thanks for the replys guys.. Just a little history on this build and why we are doing it. My son bought this car last fall, it had some Edelbrock 185cc heads and a Comp 305 magnum cam with a flat lobe. With this set up the other owner the car went 7.66 1/8th mile. My son pulled the engine, sold the old heads and bought the Brodix and we are installing the Howards cam. So basically this is a new build.. I sent out the block and crank to the machine shop, for cleaning, new cam bearings, I also had the block zero decked... My thinking with the way we are building it should run close to our goals.. The chassis is set up pretty good with all Spohn adjustable torque arm, rear sway bar, lower control arms, it has Hole Shot wheels, no heat or air, going to get a manual steering box. We are installing a S &W roll bar, might be lighter than 3500 lbs... This is his first fast car, so hopefully it gets close to our goal.. It will be midsummer before the first pass, but I will let everybody know how it does.. thanks, Gary
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1955 Chevy
496 bbc
best 60' 1.36
best ET 6.23
best MPH 110.67
TAG55 is online now  
post #7 of 38 (permalink) Unread Jan 9th, 20, 7:07 PM
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Rick
 
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Re: 355 sbc Horsepower estimate

Pretty basic build, probably closer to 400 hp.
Somewhere in the 12's for 1/4 mile.
You never mentioned new body bushings or anti roll bar.


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post #8 of 38 (permalink) Unread Jan 9th, 20, 9:58 PM
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Chris
 
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Re: 355 sbc Horsepower estimate

My Nova went 7.40's @ 94 mph, 11.78 @ 113/114 in good air with a pooch 1.68 60' with my 2 bolt .030 over 355.
Stock rods,Trw dished 4 relief pistons. Custom Cam Motion HR cam 224/232 .528" lift, 64cc AFR 195 Comp ported heads, Hurricane intake w/780ps carb, 1-3/4 super comps with full exhaust to the bumper, th350 w/ 3k tci converter and 3.73's
The compression I guess was around 9/9.5:1

Shell super as always.
60' was killing it.

3515#'s with me.
Is the 3500 with driver?


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73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #9 of 38 (permalink) Unread Jan 9th, 20, 10:47 PM
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Re: 355 sbc Horsepower estimate

Quote:
Originally Posted by WHT/73 View Post
My Nova went 7.40's @ 94 mph, 11.78 @ 113/114 in good air with a pooch 1.68 60' with my 2 bolt .030 over 355.
Stock rods,Trw dished 4 relief pistons. Custom Cam Motion HR cam 224/232 .528" lift, 64cc AFR 195 Comp ported heads, Hurricane intake w/780ps carb, 1-3/4 super comps with full exhaust to the bumper, th350 w/ 3k tci converter and 3.73's
The compression I guess was around 9/9.5:1

Shell super as always.
60' was killing it.

3515#'s with me.
Is the 3500 with driver?


355ci NA - YouTube
People need to understand what it can mean to race in "good conditions" at Englishtown. These conditions today at Englishtown could very well be 1/2 second quicker than a normal near sea level day at the track anywhere else. Incredible power making conditions that I will never see in my racing.

temperature = 30.16 deg f
relative humidity = 54 %
uncorrected barometer* = 30.64 inHg
corrected barometer* = 30.73 inHg
wind speed = 0.73 mph
wind direction* = SW (241)
more info: current metric | historical | forecast | help
dew point = 17 deg f
saturation pressure = 0.167 inHg
vapor pressure = 0.090 inHg
grains = 12.9
air density (w/o water vapor) = 109%
air density (w water vapor) = 108%
density altitude = -2766.43 ft
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post #10 of 38 (permalink) Unread Jan 9th, 20, 11:12 PM
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Chris
 
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Re: 355 sbc Horsepower estimate

Are you dissing my passes? We all know it will be slower waaaaaaaaaaaaaay up in the mountains where your located. You have mentioned this many times.
Imagine if I was at atco! Below sea level?
It's not my fault I live where I live and the track that I used (45 miles in either direction from me) has good conditions or "better air" conditions then tracks up in Denver.
I'm well aware of what good air can do as I watched my son run 11.01 up at island in 97* heat and humidity and know FULL well he would have went 10's at Englishtown or even quicker at Atco but he wanted to go so we went.
Oh yeah we don't have to worry about having good air anymore as Englishtown is a dirt lot when we went to island and we didn't want to travel 2.5hrs to atco.
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73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #11 of 38 (permalink) Unread Jan 10th, 20, 6:44 AM Thread Starter
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Gary
 
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Re: 355 sbc Horsepower estimate

Quote:
Originally Posted by mrpaticular View Post
Pretty basic build, probably closer to 400 hp.
Somewhere in the 12's for 1/4 mile.
You never mentioned new body bushings or anti roll bar.
No body bushings, its a 83 Camaro, it has a Spohn rear sway bar and all the adjustable stuff they make for these cars.. It has already been 7.66 in the 1/8th, which works out to about a 12.10 in the 1/4 with the junk cam and heads it had.. 7.66 x 1.58 = 12.10

Quote:
Originally Posted by WHT/73 View Post
My Nova went 7.40's @ 94 mph, 11.78 @ 113/114 in good air with a pooch 1.68 60' with my 2 bolt .030 over 355.
Stock rods,Trw dished 4 relief pistons. Custom Cam Motion HR cam 224/232 .528" lift, 64cc AFR 195 Comp ported heads, Hurricane intake w/780ps carb, 1-3/4 super comps with full exhaust to the bumper, th350 w/ 3k tci converter and 3.73's
The compression I guess was around 9/9.5:1

Shell super as always.
60' was killing it.

3515#'s with me.
Is the 3500 with driver?


355ci NA - YouTube
On the weight I'm just taking a SWAG we have no idea what it weighs until I get the engine together and weigh it at the track.. It has alot of stuff already removed A/C, heat, inner bumper support, glass hood, light weight wheels, ect.
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1955 Chevy
496 bbc
best 60' 1.36
best ET 6.23
best MPH 110.67
TAG55 is online now  
post #12 of 38 (permalink) Unread Jan 10th, 20, 7:09 AM
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Chris
 
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Re: 355 sbc Horsepower estimate

Removing all that stuff will definitely help make it lighter.
Got a JY near you? We paid the guy at ours $10 to use his scale.
This helped me get the weight for the front Santhuff springs.

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #13 of 38 (permalink) Unread Jan 10th, 20, 10:22 AM
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Re: 355 sbc Horsepower estimate

Quote:
Originally Posted by WHT/73 View Post
Are you dissing my passes? We all know it will be slower waaaaaaaaaaaaaay up in the mountains where your located. You have mentioned this many times.
Imagine if I was at atco! Below sea level?
It's not my fault I live where I live and the track that I used (45 miles in either direction from me) has good conditions or "better air" conditions then tracks up in Denver.
I'm well aware of what good air can do as I watched my son run 11.01 up at island in 97* heat and humidity and know FULL well he would have went 10's at Englishtown or even quicker at Atco but he wanted to go so we went.
Oh yeah we don't have to worry about having good air anymore as Englishtown is a dirt lot when we went to island and we didn't want to travel 2.5hrs to atco.

Not at all. Denver has nothing to do with this. Results one gets at Englishtown in certain times of the year will be difficult to reproduce at low altitude tracks in other parts of the country due to the extreme high barometer this area can get, 30.64 corrected baro is super charging a NA engine. When Ed Bigleys brought up, remember he raced in these unheard of conditions regularly.
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post #14 of 38 (permalink) Unread Jan 10th, 20, 1:19 PM
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Bill
 
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Re: 355 sbc Horsepower estimate

Well you certainly have some nice parts in that engine. I assume its balanced. That's a pretty hot cam for the street. I had a 230 degree roller at 50 in my 74 L82 with World Product 64 CC heads and the rest is pretty much the same as your engine.. I would put you in the 450-475HP gross range if it is properly setup. My 650DP ran better then a 750DP but you have a hotter cam so you may be able to use it. The difference wouldn't be huge though. No matter what it runs it will be a quick fun car. Mid to low 12's in the quarter. Enjoy
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post #15 of 38 (permalink) Unread Jan 11th, 20, 11:14 AM
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Rick
 
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Re: 355 sbc Horsepower estimate

Chris, your combo is very different that OP's. No comparison. I think if all works good he will be 13.0-12.5. Maybe mid 13's until all is worked out and driving improves. In the beginning everything is going against your goal.


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