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Help for tips 427 csb

General engine tech -- Drag Racing to Circle Track

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Stensland76
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Help for tips 427 csb

Post by Stensland76 » Sun Oct 06, 2019 12:21 pm

Hi
Hello im new to this forum, hope for some help.

can i get some setup tips for 427 csb for more power. Engine is used for street and strip.

427 cui.
4,125 bore
4 stroke
compression 10.6:1
227 Afr Race ready 75cc
super victor intake
850 Holly
solid roller duration .050 intake 264 exhaust 270
Gross valve lift .630 intake / exhaust
Lobe Sep 106.0
Comp Cs part # 12-908-9

What can I do to get an optimal layout? more horse power.

Car:
79 camaro
JW 350 trans
4500 stal speed
3:70 gears


Geir Stensland
Norway

Kevin Johnson
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Re: Help for tips 427 csb

Post by Kevin Johnson » Sun Oct 06, 2019 12:43 pm

Chevy, Small Block csb

SBC

F-BIRD'88
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Re: Help for tips 427 csb

Post by F-BIRD'88 » Sun Oct 06, 2019 1:38 pm

If you drag race it 1/4 or 1/8th mile and want it to et. Bit quicker a higher rear gear ratio may help.
You want the trap rpm about 4-8% above the peak hp rpm.
To use all the motor in 1/4 mi
The torque converter will then function better also.

You would want to know 1/4 mi MPH,. Rear tire true effective diameter and 1/4mi trap rpm
Calculate desired trap rpm for new gears.

6.50camaro
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Re: Help for tips 427 csb

Post by 6.50camaro » Sun Oct 06, 2019 3:29 pm

Two things stand out to me. If the cars is used more street than strip I would us a cam with 15 to 20 less degrees duration@.050 with the comp. ratio you have . If its used more strip than street I'd go with 4.11 or 4.30 gears maybe more depending on tire dia.and track length. Just my thoughts. Dan

steve316
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Re: Help for tips 427 csb

Post by steve316 » Sun Oct 06, 2019 3:31 pm

If you run small rod journal( 283 ) and comp star rods it will clear standard base circle cam. Also if you run honda rod journal they will clear a bbc standard base circle cam.

Stensland76
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Re: Help for tips 427 csb

Post by Stensland76 » Mon Oct 07, 2019 12:52 am

thanks for reply. For the most part, the car is used for 1/8 mile and litle street driving. considering mounting 4.30 gears.
tires are 28x11.5 Et street M/T

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Re: Help for tips 427 csb

Post by F-BIRD'88 » Mon Oct 07, 2019 6:11 am

What is the current 1/8th mi ET and Mph now?

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Re: Help for tips 427 csb

Post by mag2555 » Mon Oct 07, 2019 6:38 am

Your in a tuff spot!
You need way more gear at the track and less Manifold on the street ,maybe even to the point in terms of better average power numbers on the street of needing smaller port volume heads also for the street!

You need to decide where you want more bragging rights, as to great strip performance, or street performeance.

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Re: Help for tips 427 csb

Post by steve316 » Mon Oct 07, 2019 8:36 am

what block are you going to use?

Stensland76
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Re: Help for tips 427 csb

Post by Stensland76 » Mon Oct 07, 2019 1:59 pm

Best ET:
7.65 sec
speed 91
1.75 60-fot

Block is World Product SBC. primarily i will use the car to strip and street legal races.

cgarb
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Re: Help for tips 427 csb

Post by cgarb » Mon Oct 07, 2019 2:11 pm

What does this car weigh and what elevation are you racing at? It seems to me you must be having traction issues because your 60ft times are pretty slow. I would think even a pump gas 427 should run 6's in the 1/8th with AFR 227's on it. What is your ignition set up and the timing initial and total?

BigBlocksOnTop2
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Re: Help for tips 427 csb

Post by BigBlocksOnTop2 » Mon Oct 07, 2019 2:12 pm

Caltracs? Suspension tune? I bet you are blowing the tires of of it now.

Stensland76
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Re: Help for tips 427 csb

Post by Stensland76 » Mon Oct 07, 2019 3:18 pm

the car weighs up to the original, only minor adjustment to lighten the car. yes had problem with wheel spin. mounting CalTracs suspension next season.

timing 33 total at 4000rpm. 13 at idle.

The engine needs better adjustment carburetor also (this winter)

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Re: Help for tips 427 csb

Post by F-BIRD'88 » Mon Oct 07, 2019 3:29 pm

At 7.65 @ 91. (1/8) you're making less power than my muck more modest 406 SBC assuming about 3650# +/-.

It's way off the mark. Don't worry it is fixable.

The timing seems low.... Fuel octane used....? Is that why the timing is dialed back?

What ever comes off the 60ft launch comes right off the et too.... So.. ya 1.75 is pretty modest..

Lots of room for improvement.

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Re: Help for tips 427 csb

Post by F-BIRD'88 » Mon Oct 07, 2019 3:33 pm

7.65 @91 converts to 11.93 @ 112-115

This car is capable of much better.

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