355 mild upgrade - Chevelle Tech
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post #1 of 41 (permalink) Old Feb 5th, 18, 11:20 PM Thread Starter
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355 mild upgrade

355, chevy perf. 062 Vortec heads, screw in 3/8 studs, Edel. Performer intake. Edel. 600cfm carb. Scorpion 1.60 full roller rockers. Howards 110931-11 FT cam 450/450 lift. [email protected] 213/213. Duration 267/267. Lobe sep. 111. Should be 480/480 lift with the 1.60 rockers and comp beehive springs. Should be finished in a few days. Looking for your pro's and con's. Feel free to hurt my feelings! Has 1 5/8" Hedman longtubes an X pipe and Flowmaster 50's. 2 1/2" to the rear bumper. Any estimates HP and Torque?
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post #2 of 41 (permalink) Old Feb 5th, 18, 11:30 PM
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Re: 355 mild upgrade

IMHO, you should have gone with an RPM intake, a bigger cam, and a cam with an 8-12 degree split in duration.
You have a decent combo...but you could have used slightly more performance oriented parts that complimented each other better.
Should still be a decent combo, though.
Since you asked......
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'69 Malibu 383/TCI TH350/8.2 3.36 Eaton Posi. Street Edge 10" 2800, E-Tec 170s, Custom Mike Jones HR Cam, RPM Air-Gap, StreetAvenger 770, Pertronix HEI, Hedman 1 5/8" Headers, Moser Axles, PMT 1320R Kit. [email protected] 111 MPH, 1.6865 60 ft, Nitto 555
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post #3 of 41 (permalink) Old Feb 6th, 18, 12:29 AM
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What was the goal of the build? Seems like a solid street/DD type engine. Should be a fun, jump in and drive type deal with decent mileage. I'll say 1hp/cube and 385# tq? Just a WAG.

1961 Bel Air 'sport coupe' ZZ454/M21
1965 Bel Air station wagon, sbc/th350 (daily driver)
1969 C10 swb, Straub/Foxwell ZZ532, Tremec Magnum Extreme (by American Powertrain)
(sorry, no Chevelle)
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post #4 of 41 (permalink) Old Feb 6th, 18, 1:19 AM Thread Starter
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Re: 355 mild upgrade

I didn't want a gas guzzling, see you in traffic court kind of build. It'll never see a track and not many stoplight races.
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post #5 of 41 (permalink) Old Feb 6th, 18, 3:14 AM
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Re: 355 mild upgrade

Judging by your reply in post #4 as to the car's use, I think you have got it pretty much nailed!
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post #6 of 41 (permalink) Old Feb 6th, 18, 4:40 PM
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Re: 355 mild upgrade

x2 bet it runs very strong with what you have OP. Drive and enjoy

There will always be a textbook better way but at what cost

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post #7 of 41 (permalink) Old Feb 6th, 18, 11:07 PM
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Re: 355 mild upgrade

Dont get wrapped up in bench racing HP numbers. I think you will have a fun car to bomb around in. With reasonable gears and convertor the car could run in the low 13s. The last time I ran my 71 with a similar 355 it trapped at 104mph and was 3520 lbs with me in it. By the math thats showing about 310 hp. If power is important be a stickler with the timing and carb tune.

Have fun and report back.
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post #8 of 41 (permalink) Old Feb 7th, 18, 12:40 AM Thread Starter
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Re: 355 mild upgrade

200-4R with 2400 stall and 373 posi.
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post #9 of 41 (permalink) Old Feb 7th, 18, 1:57 AM
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Re: 355 mild upgrade

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Originally Posted by artmalibu View Post
Dont get wrapped up in bench racing HP numbers. I think you will have a fun car to bomb around in. With reasonable gears and convertor the car could run in the low 13s. The last time I ran my 71 with a similar 355 it trapped at 104mph and was 3520 lbs with me in it. By the math thats showing about 310 hp. If power is important be a stickler with the timing and carb tune.

Have fun and report back.
The OPs combo is NOT a low 13 second combo, IMHO. High 13s at best, possibly low 14s. Tranny and gear will help a lot....but he doesn't have enough motor to run low 13s.

He'll wind up around 350 HP, which is what a lot of us had in the 1980s and early '90s. But he's able to hit that number with a milder cam b/c his Vortec heads are better than what we had back then. That is not the worst thing in the world. Far from it.

Then again, he doesn't care how fast he goes.....which is totally fine.
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'69 Malibu 383/TCI TH350/8.2 3.36 Eaton Posi. Street Edge 10" 2800, E-Tec 170s, Custom Mike Jones HR Cam, RPM Air-Gap, StreetAvenger 770, Pertronix HEI, Hedman 1 5/8" Headers, Moser Axles, PMT 1320R Kit. [email protected] 111 MPH, 1.6865 60 ft, Nitto 555
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post #10 of 41 (permalink) Old Feb 7th, 18, 9:13 AM
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Re: 355 mild upgrade

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Originally Posted by blue_69_malibu View Post
The OPs combo is NOT a low 13 second combo, IMHO. High 13s at best, possibly low 14s. Tranny and gear will help a lot....but he doesn't have enough motor to run low 13s.

He'll wind up around 350 HP, which is what a lot of us had in the 1980s and early '90s. But he's able to hit that number with a milder cam b/c his Vortec heads are better than what we had back then. That is not the worst thing in the world. Far from it.

Then again, he doesn't care how fast he goes.....which is totally fine.
Not to argue but it sounds like my 71 has a very similar engine. My heads are AFRs but likely not a big advantage because my cam is about identical to the OPs and I dont have the 1.6 rockers to get the much needed lift. I also have 3.42 gears with 28 inch tires and a TH350 trans so the OPs car should better my 60 foot time. My convertor was not very good and flashed at 2200 that didnt help. Before I put the AFRs on I has a set of 882s all else the same and it ran a best of 13.9 @ 98 mph the AFR heads took it down to 13.3 @104. I think most of the gain came from the jump in compression due to the combustion chambers were 76cc on the 882s and 65cc on the AFRs. The vortec has 64cc so power between my engine and the OPs should be close.

The HP numbers based on my track speeds and weight are about 310HP. So if he has 350HP It should do as well..


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post #11 of 41 (permalink) Old Feb 7th, 18, 10:46 AM Thread Starter
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Re: 355 mild upgrade

This engine was [email protected] HP and [email protected] Torque. Does anyone know if these are the true numbers? I read somewhere that the true hp was more like 238 or in that range. Other than boring .030, the engine was rebuilt to stock specs.
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post #12 of 41 (permalink) Old Feb 7th, 18, 11:14 AM
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Re: 355 mild upgrade

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Originally Posted by jerry van View Post
This engine was [email protected] HP and [email protected] Torque. Does anyone know if these are the true numbers? I read somewhere that the true hp was more like 238 or in that range. Other than boring .030, the engine was rebuilt to stock specs.
I'm not sure what you mean by "stock". Stock....what?

Your torque number is good. Your HP is low and the RPM point of peak HP is also low.....but they are related.

Not sure what you mean by true HP. But most people measure HP at the flywheel (Gross) or at the rear wheels. For example, my combo is roughly 480 Gross HP around 5800 RPM and 361 at the rear wheels.

'69 Malibu 383/TCI TH350/8.2 3.36 Eaton Posi. Street Edge 10" 2800, E-Tec 170s, Custom Mike Jones HR Cam, RPM Air-Gap, StreetAvenger 770, Pertronix HEI, Hedman 1 5/8" Headers, Moser Axles, PMT 1320R Kit. [email protected] 111 MPH, 1.6865 60 ft, Nitto 555
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post #13 of 41 (permalink) Old Feb 7th, 18, 11:20 AM
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Re: 355 mild upgrade

Quote:
Originally Posted by artmalibu View Post
Not to argue but it sounds like my 71 has a very similar engine. My heads are AFRs but likely not a big advantage because my cam is about identical to the OPs and I dont have the 1.6 rockers to get the much needed lift. I also have 3.42 gears with 28 inch tires and a TH350 trans so the OPs car should better my 60 foot time. My convertor was not very good and flashed at 2200 that didnt help. Before I put the AFRs on I has a set of 882s all else the same and it ran a best of 13.9 @ 98 mph the AFR heads took it down to 13.3 @1 04. I think most of the gain came from the jump in compression due to the combustion chambers were 76cc on the 882s and 65cc on the AFRs. The vortec has 64cc so power between my engine and the OPs should be close.

The HP numbers based on my track speeds and weight are about 310HP. So if he has 350HP It should do as well..
Art: You aren't giving your AFR heads their due. They had more to do with your power increase than you may think....or so I opine. One point in compression is roughly 4% in HP. So, at the 300 HP level, a full point increase in compression is only 12HP. Even old AFR heads are great heads.

When I went 12.99 @ 106 MPH, I was making 310 HP......at the wheels, running a turd convertor that was basically stock and didn't really stall much above stock. Gross HP was probably 420-430....if my rings weren't shot. The OP's motor will not be anywhere near that.

'69 Malibu 383/TCI TH350/8.2 3.36 Eaton Posi. Street Edge 10" 2800, E-Tec 170s, Custom Mike Jones HR Cam, RPM Air-Gap, StreetAvenger 770, Pertronix HEI, Hedman 1 5/8" Headers, Moser Axles, PMT 1320R Kit. [email protected] 111 MPH, 1.6865 60 ft, Nitto 555
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post #14 of 41 (permalink) Old Feb 7th, 18, 12:01 PM Thread Starter
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Re: 355 mild upgrade

Stock as how it left the factory. No cam, heads, or intake upgrades when it was rebuilt other than the .030 rebore. HP and Torque numbers are from owners manual. I do know GM liked to fudge the rated figures.
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post #15 of 41 (permalink) Old Feb 7th, 18, 12:13 PM Thread Starter
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Re: 355 mild upgrade

The Compression is 10.25 again according to owners manual.
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