Hoping for good results from my 408 combo

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Michael Scott

Michael Scott

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Joined
Apr 11, 2018
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Location
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I' putting together my first 408
Going in my 69 dodge dart weighing 3250lbs. 3500stall. 4-10gear
Motor combo is balanced
Indy 360-H1-1K heads and Indy single plane intake. 210 intake runners
2-10int 1-65ex vlvs
Scat crank 11.25 to 1 forged Icon pistons. 850 carb. Hughes flat tappet hydraulic cam .582int .600exh lift
Hoping mid to low 11s on motor and low tens with 150shot nitrous
Gonna be fun
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Should run 10’s without working up a sweat. Cam is tiny, but maybe you have a reason for that.
 
jealous about your top end......how much are these heads, intake and rockers?

You should reach your goals without much trouble.

Michael
 
The only thing I would change is go solid lifter. I run 12.0 with no where near your intake or exhaust. Your heads are probably better also.
 
360duster said:
jealous about your top end......how much are these heads, intake and rockers?

You should reach your goals without much trouble.

Michael
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That setup ready to bolt on comes withs all gaskets and studs is $4295. Includes intake. Rockers complete heads
 
Well I hate your choice of convertor but other than that if it wouldn't run low 10's NA I would throw it off the highest nearby bridge.
 
pittsburghracer said:
Well I hate your choice of convertor but other than that if it wouldn't run low 10's NA I would throw it off the highest nearby bridge.
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I' going with a 3500to 3800 stall because it is going to be on the hwy a lot. If i don' like the way it performs then there is a 4200stall converter just sitting and waiting
 
Sounds like a winner to me! Lots of airflow through the heads, moderate cam. If it had less head flow, i would like to see how the car would perform with a dual plane intake, since you have a fairly tight converter. Maybe some of the engine builders here have tried a similar combo with both intakes. My 408 with lowly EQ heads made 504 hp with an airgap intake and 10/1 compresion, similar cam, 850.
 
Mine makes 490 hp 523 TQ with 10 to 1CR Eddy heads 566/.578, dur @ .050 244/248 with a
108 LSA. 850 quick fuel. I would think your will be quite a bit more, the heads are the limiting factor on mine.
 
gregsdart said:
Sounds like a winner to me! Lots of airflow through the heads, moderate cam. If it had less head flow, i would like to see how the car would perform with a dual plane intake, since you have a fairly tight converter. Maybe some of the engine builders here have tried a similar combo with both intakes. My 408 with lowly EQ heads made 504 hp with an airgap intake and 10/1 compresion, similar cam, 850.
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What kind of times yours turning
 
So are they as cast or ported ?
What do they flow ?
 
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Michael Scott said:
Current motor 100shot drops it a second and a tenth and with 150shot drops it a second and 8tenths so I fgure 150 should get a second out of this setup
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Interesting, maybe the hotter a motor is, the less it will drop it . I had an approx. 600horse vega, that was originally built by don hardy /east texas race cars, a 100 shot only dropped it from 70`s to 20`s, 1/2 second. It was tubbed /14x32`s, ladder bars, only weighed 2440 pounds w/o me in it.
 
why so much more exhaust lift than intake restricted exhaust or something
do you have head flows?
 
Michael Scott said:
What kind of times yours turning
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My motor is still sitting in the shop, waiting for install. Lots to do on the car.
65 Dart, 3.55 gears, 3200 stall, no cold air package, so i figure it will mph high, (118?) but ET will be off quite a bit due to converter, and tires. Time will tell.
 
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