Suggestions for getting more out of 350 - Chevelle Tech
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post #1 of 47 (permalink) Old Dec 8th, 19, 1:51 PM Thread Starter
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Sam
 
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Suggestions for getting more out of 350

Hi everyone, over the winter I'm pulling my engine for modifications. It's a basically stock 350 that was rebuilt yrs ago. I did put a cam in it but that was so long ago I don't remember the specs. I also don't remember if the Pistons are dish or flat so for now I'm assuming it's 8 to 8.5-1 compression. It currently has a performer intake Holley 600 and headers with 3.90 gears and stock converter. It runs strong could be wishful thinking but I feel like there's still a good amount power I can get out of it. I was gonna rebuild it but after running it I wanna see how much more potential it has. My plan is new heads cam and converter. I ran it recently and made 3 runs all 14.4 at 95 mph. I'm thinking 64cc heads not sure about which cam though. I would appreciate any suggestions for cam choice. I put a link to my last run
Thanks
https://youtu.be/yGwIAEYEqD0
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post #2 of 47 (permalink) Old Dec 8th, 19, 2:48 PM
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Re: Suggestions for getting more out of 350

Vortec heads with the best valve job you can afford, Air Gap, 650 Holley or QF 650, it should put you in the 13's pretty easy.
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post #3 of 47 (permalink) Old Dec 8th, 19, 3:31 PM
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Re: Suggestions for getting more out of 350

Good suggestion above, the only thing I would add IF budget allows, is really good heads and decent converter.
I would also add a HR but that's even more money tho.

If you do have dished pistons, I would use a shim for a head gasket too.
I used it for my iron heads and the AFR's on my 355 to bump compression and help quench.

That combo, AFR 195's, 227/232 .528" lift hr, single plane with 750, th350 with a tci streetfighter converter and 3.73's went an [email protected] 113.5 mph with a pooch 1.68 60'.

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 #4 of 47 (permalink) Old Dec 8th, 19, 4:18 PM
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Re: Suggestions for getting more out of 350

Ok this was a guy I hung around back in the 80s. Stock 1980 z28. He did shift kit with 3500 stall and 4.10 gears. Motor was stock gm bottom end i think 1 3/4 headers that i don't know exactly. Put brodix iron track 1 head roller tipped rockersholley strip dominator intake with 650 double pump carb. Cam was hydraulic 500/300 with rhoads lifter. That 3800 lbs z28 would run 12.70.

RH
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post #5 of 47 (permalink) Old Dec 8th, 19, 5:05 PM Thread Starter
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Sam
 
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I'm definitely gonna put in a new converter. I wasn't able to leave any higher than about 1,000 rpms tires wouldn't hold. It went 2.1 to the 60' and by the 1,000 mark it went flat. I'm hoping a converter will improve my 60' and a new valve train will help it up top. I'm thinking about the brodix lk80 heads with the voodoo 268 cam and matching converter.
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post #6 of 47 (permalink) Old Dec 8th, 19, 5:18 PM
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Re: Suggestions for getting more out of 350

A converter won't help your 60' if you're already having traction problems. It'll probably get worse.
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70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #7 of 47 (permalink) Old Dec 8th, 19, 5:34 PM Thread Starter
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A converter won't help your 60' if you're already having traction problems. It'll probably get worse

That's a good point. I'll look into a set of drag radials.
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post #8 of 47 (permalink) Old Dec 8th, 19, 6:25 PM
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Tom
 
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Re: Suggestions for getting more out of 350

You're leaving a couple tenths on the table with your current engine. You definitely need some drag radials and need to look into getting some weight transfer. More power and a converter that flashes closer to peak torque is going to make your 60 way worse.

70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #9 of 47 (permalink) Old Dec 8th, 19, 8:10 PM Thread Starter
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Quote:
Originally Posted by Tommy the Cat View Post
You're leaving a couple tenths on the table with your current engine. You definitely need some drag radials and need to look into getting some weight transfer. More power and a converter that flashes closer to peak torque is going to make your 60’ way worse.
I'm not sure I follow. How would more power and converter hurt my 60'?
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post #10 of 47 (permalink) Old Dec 8th, 19, 8:18 PM
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Rick
 
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Re: Suggestions for getting more out of 350

If you do not eliminate tire spin you are wasting time and money. The complete package is bumper to bumper for any combo.


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post #11 of 47 (permalink) Old Dec 8th, 19, 8:40 PM Thread Starter
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Quote:
Originally Posted by mrpaticular View Post
If you do not eliminate tire spin you are wasting time and money. The complete package is bumper to bumper for any combo.
My bad I misread the previous post
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post #12 of 47 (permalink) Old Dec 8th, 19, 8:42 PM
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Re: Suggestions for getting more out of 350

Quote:
Originally Posted by snake2k View Post
I'm not sure I follow. How would more power and converter hurt my 60'?
Because more power and/or a converter that flashes closer to peak torque will hit the tires harder. If you're already struggling with traction it's only going to get worse with increased power and/or a converter that flashes higher.

Your MPH will go up but your 60 will probably get worse because you'll spin more at the line. Radial tires typically don't recover once you break the traction threshold. Usually you have to back all the way out of the throttle and allow the tires to grab and match vehicle speed once they lose grip. Staying in the throttle is a good way to end up in the wall/other lane/ditch.
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70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #13 of 47 (permalink) Old Dec 8th, 19, 8:53 PM
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Re: Suggestions for getting more out of 350

Quote:
Originally Posted by mrpaticular View Post
If you do not eliminate tire spin you are wasting time and money. The complete package is bumper to bumper for any combo.
x2. My daughters 300hp Mustang can outrun my Chevelle right now because at least she could just floor it and take off. My 1st gear is basically worthless at WOT at anything less than 40mph with these all-season radials I'm running.

'72, 385 sbc, Voodoo roller, 219/227; .515/,530 lift; AFR 180cc Eliminators, RPM Air-Gap, 770 Avenger, TH350 trans, 12 bolt 3.42's, Eaton Posi, TCI 2000 stall, Pypes 2 1/2" X-pipe system w/Race Pro's
Vehicle weight: 3390 lbs
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post #14 of 47 (permalink) Old Dec 8th, 19, 9:25 PM
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Back in the early ‘90s, I worked on my cast piston 355, installed a Wolverine 280/480 HFT cam. With the 882 1.94/1.5 valve heads, stock stall and 4.10 gears, it went 14.15 @ 98 mph. No other changes, swapped for double hump 1.94/1.5 heads and it went 13.5 @ 101.5. This was at about 3550 lbs on 235/60 Dunlop tires - dead hooking.

It’s been my experience, it’s much easier to dead hook on radials if you under-stall the combination slightly. You have 3.90s, considering your stall, use a healthy cam or get sticky tires to hook a small cam.

Proving every day hindsight is 20/20.
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post #15 of 47 (permalink) Old Dec 8th, 19, 10:21 PM Thread Starter
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Sam
 
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Now I'm thinking about just getting slicks instead of drag radials. You guys think this is too much for cam for my engine? I plan on changing the heads to support the new cam.

https://www.summitracing.com/parts/lun-10120703lk/
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