super victor on a mild combo - Chevelle Tech
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post #1 of 28 (permalink) Old Mar 22nd, 20, 7:44 PM Thread Starter
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Matt
 
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super victor on a mild combo

Hi guys. Just wondering if any of you have some insight as to whether it would be worthwhile to swap intake manifolds. This combo is a little unconventional and what I'd like to do is soften the 60 ft just a bit and gain some MPH on the big end.

I like to cruise this car on the highway (occasional street race) and often drive it to the track (over 100 miles each way) so I don't want to give up the 3.08 gears. The new vette would blow my doors off in a street race. I'd like to close the gap a bit.

In the 1/4 mile, I never hit 3rd. I shift into 2nd (around 6600 rpm) at 70 MPH and cross the stripe (around 6800) in 2nd. The car sixty foots in the low 1.7's. I have to roll into the throttle to maintain traction otherwise I smoke the Nittos. Perhaps with a new set of Mickeys I could hit it harder and get into the 1.6s, but I'd hate to blow up the 10 bolt rear. So a soft launch is ok with me. I love the fact that the car runs 11.70's but I'd like to see more mph. It currently goes 116mph, which is decent but I'd love to see more like 120.

Here is the current combo:
small chevy 423 (4.165 bore and 3.875 stroke) with 10.25 compression.
cylinder quench is .049. I could close that to .037 with a set of Cometic gaskets and get a .3 compression bump.
Brodix dragon slayer heads (300 cfm). Beehive springs and titanium retainers.
custom hyd roller 240/243 with .600 lift (1.6 ratio). 110 sep.
Hooker super comp headers 1 3/4 primaries, 3 inch collector
Pro-Systems 840 carb
Edelbrock Performer RPM intake (not the air-gap).
11 inch converter (3000 stall) by Turbo Action.
Factory 3.08 gears (use only 1st and 2nd in the 1/4 mile).

Engine pulls to 7k. I feel that the power seems to flatten around 6200 (probably from the dual plane intake) and fall off after 6600 (perhaps cam peaking).

From what I've read, a small block of this size, with its tremendous piston speed needs adequate cross-sectional area (CSA) to hit it's potential. I'm certain the Performer RPM is holding things back in that department. Perhaps a Wilson ported Super Victor would help things out... Thoughts/comments?

1966 Chevelle, mild SBC stroker, factory 10 bolt, 3.08 gears, column shift, Performer RPM intake. 11.70's at 116 mph through 2 1/2 exhaust.
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post #2 of 28 (permalink) Old Mar 22nd, 20, 7:55 PM
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Gary
 
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Re: super victor on a mild combo

Sbc dual planes are fairly small and restrictive. They work great to about 450 hp. Your car would definitely be faster with an open plenum intake.you might try an open spacer. The car would prob et quicker if you lowered your shift rpm to 5500and shift I to 3rd. Hard to believe you use only 2 gears even with a 308 when you're in the 11s
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post #3 of 28 (permalink) Old Mar 22nd, 20, 7:58 PM
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Rick
 
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Re: super victor on a mild combo

Any suspension mods?
What size tire?
Info on fuel delivery system.


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post #4 of 28 (permalink) Old Mar 22nd, 20, 8:16 PM
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Jim
 
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Re: super victor on a mild combo

Do you have room under the hood?

Jim

77 Monte
421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. from Jake 200-4r w/ 3.73's
Machine work by Torvinen's machine
11.93 @ 112.7 & tuning
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post #5 of 28 (permalink) Old Mar 22nd, 20, 8:49 PM Thread Starter
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Matt
 
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Re: super victor on a mild combo

Stock suspension except for sway bar upgrades (1 1/4 front, 7/8 rear), Hotchkis 1 inch lowering springs, 9/10 front shocks and 50/50 rear.
tires are Nitto 275/60-15.
fuel pump is a mechanical rated to 600hp. The factory 5/16 fuel line was upgraded to 3/8. A/N -6 lines with radius fittings. No 90 degree fittings.
i'm running a 1 inch spacer. hood clearance will accept a 5.5 inch tall manifold.

1966 Chevelle, mild SBC stroker, factory 10 bolt, 3.08 gears, column shift, Performer RPM intake. 11.70's at 116 mph through 2 1/2 exhaust.
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post #6 of 28 (permalink) Old Mar 22nd, 20, 8:55 PM Thread Starter
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Matt
 
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Re: super victor on a mild combo

Quote:
Originally Posted by gnicholson View Post
Sbc dual planes are fairly small and restrictive. They work great to about 450 hp. Your car would definitely be faster with an open plenum intake.you might try an open spacer. The car would prob et quicker if you lowered your shift rpm to 5500and shift I to 3rd. Hard to believe you use only 2 gears even with a 308 when you're in the 11s
I have a spacer on it now. It helped the top end, but mostly helped the vapor lock that I got here in the hot Florida summer.

I tried shifting sooner and shifting into 3rd. It hurt the MPH quite a bit.

1966 Chevelle, mild SBC stroker, factory 10 bolt, 3.08 gears, column shift, Performer RPM intake. 11.70's at 116 mph through 2 1/2 exhaust.
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post #7 of 28 (permalink) Old Mar 23rd, 20, 12:00 AM
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Kerry
 
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Headers are too small for that cubic inch small block. 1 7/8”, and I hope you have 3” exhaust, with x pipe and good flowing mufflers like ultra flows or magnaflow. NOT flowmasters. Read here about header size on a 423.

https://www.speed-talk.com/forum/vie...57826&start=45

I think your cam should have more exhaust duration.
Considering your gear, I would keep the performer rpm and send it to Wilson for porting.
Then still run a 1” open spacer.
How big is your air filter?
Have you connected a vacuum gauge and ran it at the track to see if your carb is big enough?
Have you had someone sit in the car, floor the pedal and confirm you are getting full throttle?

How much timing are you running?
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Last edited by pockets; Mar 23rd, 20 at 12:20 AM.
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post #8 of 28 (permalink) Old Mar 23rd, 20, 12:31 AM
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post #9 of 28 (permalink) Old Mar 23rd, 20, 10:09 AM
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Re: super victor on a mild combo

Quote:
Originally Posted by gnicholson View Post
Sbc dual planes are fairly small and restrictive. They work great to about 450 hp. Your car would definitely be faster with an open plenum intake.you might try an open spacer. The car would prob et quicker if you lowered your shift rpm to 5500and shift I to 3rd. Hard to believe you use only 2 gears even with a 308 when you're in the 11s
I can see it. The 3.08 gear is exactly how I run my drivers as well, I believe this combination delivers the best performance with being able to drive down the hi way, over an over drive trans, I applaud you! But......I'm not sure your intake is your problem, it will be interesting to see. The RPM you need to turn at the top of 2nd gear to me means HYD roller R&D on the dyno. Good luck, let us know.
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post #10 of 28 (permalink) Old Mar 23rd, 20, 5:10 PM
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Re: super victor on a mild combo

The 2925 SV makes great power down low and even more if you port the plenum area. I know I did mine and it worked even better ported. The one thing is without porting the 300-25 Strip Dominator will kill the SV on the top end, The Strip Dominator is just less restrictive out of the box.


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post #11 of 28 (permalink) Old Mar 23rd, 20, 5:50 PM
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Re: super victor on a mild combo

The heads and cam are probably not helping matters either...switching intakes would help some, but Iím thinking it still wonít make power up at the top.

I would swap intakes if you have it...

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post #12 of 28 (permalink) Old Mar 23rd, 20, 7:31 PM
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Re: super victor on a mild combo

There is always someone faster. If you want to be one of the top dogs in your area you need to change plans.
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post #13 of 28 (permalink) Old Mar 23rd, 20, 7:36 PM
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Rick
 
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Re: super victor on a mild combo

What is the real cfm for that carb?
Your instant center?
Pinion angle?
You need to work on the suspension. It will not work good until you do.


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post #14 of 28 (permalink) Old Mar 23rd, 20, 7:45 PM
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Re: super victor on a mild combo

3.08 rear gear, 1.7 60 foot times driving it out of the hole and running 11.70's ..I feel you are doing very well.
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post #15 of 28 (permalink) Old Mar 23rd, 20, 8:33 PM
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Re: super victor on a mild combo

HI
Tire diameter is the only way to measure gear ratio .
What is your diameter ??????? 275 60 15 711mm 28 inch

2200 RPM at 60 mph in top gear
Anywhere upto 3000 RPM at 60mph is fine for a mild build
Serious builds are around 3300 and up at 60mph

Need to get the most rear traction

Exhaust 1 7/8 primaries
Over 410 cuin 1 3/4 become restrictive

Dragon slayer heads
3 specifications for great heads in priority
1/ pinch /MCSA min cross section area expect 2.2 sq inch Brodix slayer ???????
2/ valve size and MCSA work together 2.08 minimum if not 2.1 inch
3/ flow 300cfm at 600lift

Over 410cuin RPM dual plain becomes restrictive

Try Weiand Team G 7530 if bonnet clearance is an issue

Similar set up
406 cuin Dart
13:1 CR
227 Afr heads
1 7/8 primaries
260+ cam Solid Roller
tyre 275 50 15
rear gear 4.3
super victor
peak hp 6800 rpm
1/4 mile 10.6 sec
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