mild 396 build Looking for more RPM and HP - Team Camaro Tech
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post #1 of 5 (permalink) Old Oct 3rd, 09, 10:49 AM Thread Starter
TTO
 
Join Date: Oct 2009
Location: Wi.
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mild 396 build Looking for more RPM and HP

Looking for some feedback for my 396 build, started with an all original L34 396 +.030 now a 402 with one exception the cam [Comp cam 11-238-3 XE262H]. All other parts original Carb 4160 Holley 585cfm cast intake, heads 2.06/1.72 with no porting, stock points distibutor with all timing in [35deg.] by 5000, exhaust stock cast iron manifolds. New pistons 10:1 comp ratio. 1st dyno run was [email protected] then fell south. torq [email protected]. Any other adjustments I can make to this setup to squeeze a few more rpm's and HP?
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post #2 of 5 (permalink) Old Oct 3rd, 09, 11:56 AM
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Kevin
 
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Re: mild 396 build Looking for more RPM and HP

If you're looking for more upstairs, it's time for some more airflow. I doubt you'll ever get any more working with that carb/intake/head combo. I had a 396 years ago that fell off after 5000. I was using an Edelbrock Performer intake, which I discovered later is actually a peanut port intake! Good for a pickup perhaps, but not a hot rod.

If you're trying to maintain a stock look, try porting the heads and intake and upgrading carb size.

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'69 X44, stock 350 (for now), TH350, 3.70:1 gear 8.5" 10 bolt, Auburn Posi.
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post #3 of 5 (permalink) Old Oct 3rd, 09, 12:53 PM
 
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Re: mild 396 build Looking for more RPM and HP

A little bigger carb and some more cam(I would start at high 270's to low/ mid 280's if your comp atually works out to 10-1)
I can tell you that street 396's love the old Crane 3/4 race(low 280's) cam
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post #4 of 5 (permalink) Old Oct 7th, 09, 08:40 PM Thread Starter
TTO
 
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Location: Wi.
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Re: mild 396 build Looking for more RPM and HP

I'm going to run a Holley 4150 3310 780cfm not the original Holley 4160 585cfm hope that gives me a few more hp's

What kind of 1/4 mile times could I produce with a honest flywheel 350hp motor M20 muncie and 3:73 posi. car weight 3,550lbs

There is no way a Factory 396 350hp made that kind of power and I say that beacause I'm making 354hp with a bigger cam better timming and I'm sure alot more motor detail.
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post #5 of 5 (permalink) Old Oct 7th, 09, 09:24 PM
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Wes
 
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Location: Leander, TX
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Re: mild 396 build Looking for more RPM and HP

If you can swing it, get these heads:

http://brodix.com/heads/raceritebb.html

They'd be worth from 50 to 100 hp over the stockers.

If not, find some 049s or 781s oval ports and have them ground for the bigger valves and the have ports massaged a bit.

Also, an RPM Performer would be a good investment.

Headers,..you need them,..worth at least another 20 HP.

Carb,..I'm comfused. The L-34 came with a Q-Jet; not a holley.

For a cam recommendation, we need to know more about the rear gear, tranny, vacuum requirements, and your goals for the car.

But, another 100-150 HP is easy,..if you have the cabbage.

Good luck!
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