400 Small Block Build And Dyno Test - Chevelle Tech
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post #1 of 342 (permalink) Old Mar 26th, 20, 11:46 PM Thread Starter
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MARK
 
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400 Small Block Build And Dyno Test

A forum member had me build a mild 406 for his 71 Chevelle, I thought I would post some pictures. I had a very nice thick 817 production block, bore and stroke 4.155 X 3.750, with a 7/16 6 inch rod and a Mahle piston, we ended up with 10.3 compression. The cam is hyd roller, 234/238 @ .050 .560/.530 lift on a 110. We used a AFR 195 head with modifications and a performer RPM air gap intake with a 1 inch open spacer. Carb is a AED 750 CFM. We plan on testing different distributers, locked and with a timing curve. Gas will be 91 octane from 7-11. Should be a interesting build. I should mention the valve job from AFR was a disaster.
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post #2 of 342 (permalink) Old Mar 27th, 20, 12:51 AM
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Re: 400 Small Block Build And Dyno Test

HI
Very interested in the dyno sheet . Considering the emphasis on mid range is the dyno sheet going to give readings between 2500 thru 6500??
engine vacuum at idle eg 12 inches at 850rpm ???.
Results for dyno 400 street motors are a little scarce most hardly include any details .
As street motors can have vastly different rear gear the dyno curve is interesting 2500---3000 rpm
To get the most out of any top end a dyno test will also show how quick the drop off is after peak at up to 6500 for tq and hp

A guess for peak tq is at 4800rpm ,Peak HP at around 6000rpm
manifold and heads would be ok but I would consider them the limiting point

Seen 5 deg smaller cam with 195 street AFR and Weiand single manifold similar build . Corvette forum Wes Migletz

Hope test goes well.
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post #3 of 342 (permalink) Old Mar 27th, 20, 6:39 AM
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Re: 400 Small Block Build And Dyno Test

Considering a similar build for my 67. Would like to know the results!

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
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post #4 of 342 (permalink) Old Mar 27th, 20, 7:45 AM
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Gene
 
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Re: 400 Small Block Build And Dyno Test

When is it going on the dyno Mark? Sounds stout from the parts selection and assembly so far!

Gene
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post #5 of 342 (permalink) Old Mar 27th, 20, 9:11 AM
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Re: 400 Small Block Build And Dyno Test

I'll make a guess on Torque and Power numbers



Trq 488 @ 4500 rpm
HP 514 @ 6000 rpm

Andy

1969 GTO 433" BBC 990 Rec Heads, Richmond 5spd, 12 Bolt Moser, Straub Hyd Roller - 440 HP at the wheels

1976 Vega 8/71 408" BBC 675HP , TCI 350 9 inch - Comp Cams Hyd Roller, 14 Pt cage, Fiberglass Frnt end
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post #6 of 342 (permalink) Old Mar 27th, 20, 9:16 AM
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Rick
 
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Re: 400 Small Block Build And Dyno Test

Oh no, the dreaded 7-11 doughnut / gas stop !


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post #7 of 342 (permalink) Old Mar 27th, 20, 9:40 AM
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Re: 400 Small Block Build And Dyno Test

I built a nice little 406 a few years ago for a truck.

I too will be interested to see what this mighty mouse makes.


76 impala 400.

Bored .30 over.
Scat internally balanced 5.7 rod crank.
Scat 5.7 rods.
DSS forged pistons.
Dart 200cc SHP heads. (ported and polished) bench flow tested to 218cfm....
Crower roller cam and full roller valve train. 1.6 rockers. Cam number 00469
MSD ready to run distributor.
Performer RPM air gap intake.
APR studs and bolts through out.
10.1 compression
Fast EZ EFI.

With a 850 DP on the dnyo it made 474hp @5800rpm and 514 ft lbs @4400rpm
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post #8 of 342 (permalink) Old Mar 27th, 20, 10:43 AM
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Re: 400 Small Block Build And Dyno Test

Any porting? What were the flow numbers?

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post #9 of 342 (permalink) Old Mar 27th, 20, 10:54 AM
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Re: 400 Small Block Build And Dyno Test

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Originally Posted by 70GS455 View Post
Any porting? What were the flow numbers?

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post #10 of 342 (permalink) Old Mar 27th, 20, 11:42 AM
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Re: 400 Small Block Build And Dyno Test

Quote:
Originally Posted by VORTECPRO View Post
A forum member had me build a mild 406 for his 71 Chevelle, I thought I would post some pictures. I had a very nice thick 817 production block, bore and stroke 4.155 X 3.750, with a 7/16 6 inch rod and a Mahle piston, we ended up with 10.3 compression. The cam is hyd roller, 234/238 @ .050 .560/.530 lift on a 110. We used a AFR 195 head with modifications and a performer RPM air gap intake with a 1 inch open spacer. Carb is a AED 750 CFM. We plan on testing different distributers, locked and with a timing curve. Gas will be 91 octane from 7-11. Should be a interesting build. I should mention the valve job from AFR was a disaster.
Are you finding that those 1" spacers are pretty consistently giving you a little extra power, or is it just something the customer wanted?

'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 #11 of 342 (permalink) Old Mar 27th, 20, 12:11 PM
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Re: 400 Small Block Build And Dyno Test

Quote:
Originally Posted by VORTECPRO View Post
Should be a interesting build. I should mention the valve job from AFR was a disaster.

Runout or otherwise, just curious.
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Bill Koustenis
Advanced Automotive Machine
Waldorf Md


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post #12 of 342 (permalink) Old Mar 27th, 20, 12:16 PM
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Chris
 
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Re: 400 Small Block Build And Dyno Test

530/500+lbs.
You know I love these engines! Mine had/has the OTB 195 64cc comps from 15yrs ago (on the engine in my sig)!. Still going!
6" scat H with beams,7/16 bolts, -22 D dish Mahle's 2 bolt studded mains.
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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 #13 of 342 (permalink) Old Mar 27th, 20, 1:14 PM
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Re: 400 Small Block Build And Dyno Test

Really interested in the results too because when I added the 1' spacer to my RPM Performer on my 406 it really woke it up.No real dyno results however it felt better all through the gears.
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John
71 El Camino SS
406 SBC M21 3.31 12 bolt
"Quality is always remembered,long after the price is forgotten"
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post #14 of 342 (permalink) Old Mar 27th, 20, 1:32 PM
Kim
 
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Re: 400 Small Block Build And Dyno Test

AFR must have gotten worse. My pre eliminator 1050 heads were dead on, but I did buy them used. Maybe previous owner corrected them.

OP that 400 is going to be a real nice street machine. My 400 build is quite similar. Don't expect a long timing curve.
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post #15 of 342 (permalink) Old Mar 27th, 20, 3:12 PM
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Re: 400 Small Block Build And Dyno Test

Quote:
Originally Posted by 71350SS View Post
Really interested in the results too because when I added the 1' spacer to my RPM Performer on my 406 it really woke it up.No real dyno results however it felt better all through the gears.
Mine needed it too. This was when the 355 had those heads(my AFR's) and the A/G. car slowed down without it.
No dyno test, just track.
Whoever gets this 406 will be very happy, maybe even surprised what they can do.
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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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