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#1
04-22-2018, 11:23 AM
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406 dyno results
Hello All,
I´ve been following the forum for quite sometime but joined just recently. My motor was in dyno after cam swap (new HFT cam) and I thought results might be in interest here in street section. So: 1968 400 +.030 , L-2262F pistons. Done 15yrs and 25K miles ago. 3.750 stroke, factory Nodular crank, 4-bolt mains, factory 6.625 rods, ARP studs and bolts. Factory intake, no porting. 670 cfm carb, vacuum secondaries, 71 and 74 jets, 1" 4-hole adapter, long tube headers. Pontiac HEI, tuned up. 15° initial, 33° total. Factory 72CC D-port heads, 2.11 and 1.77 valves, intake seat angle 30°, exhaust 45°, factory 1.5 rockers, no porting. Now heads were checked for straightness, leaks etc. and chambers measured, bottleneck studs changed to ARP 7/16 studs + locks. Actual CC is 74,5. Hardened seats were installed to exhaust. HyLift Johnson lifters with Smith Bros 5/16 one piece pushrods, .083 wall. After consulting a member of this forum I chose Voodoo 703 for new cam. New springs were set for 130lbs on the seat, 310lbs open as recommended. Installed height 1.79". CR 9.65 In the dyno this combo made 377hp @ 5300 , 447 lb.Ft. @ 3800 Torque was over 400lb.Ft from start of the measuring point 2500 up to 5000. Motor is meant to be reliable and fun street engine in a 68Bird, manual transmission, 3.90 gears.
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 68 Bird
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#2
04-22-2018, 12:27 PM
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Sounds like a nice build, good torque, well done, sir.
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"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
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#3
04-22-2018, 12:42 PM
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Nice job!
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#4
04-22-2018, 01:06 PM
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Awesome job! Welcome to the Forum. Just curious, your location say Hki. Where is that?
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#5
04-22-2018, 01:24 PM
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Thanks,
in Finland. Abbreviation of Helsinki
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68 Bird
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#6
04-22-2018, 02:10 PM
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nice job
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1980 TA 455 th400 2.56 posi [email protected] http://www.dragtimes.com/Pontiac-Tra...lip-29967.html http://www.youtube.com/watch?v=6X5XJ9PR1Qw https://www.youtube.com/user/hal101/videos |
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#7
04-22-2018, 02:50 PM
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Awesome! That should be fun! I especially like your combo. It is almost identical to my 406, and estimates for my build was around 380hp.
Great numbers. Did it have a chance for tuning? I wonder if you have a little bit more in it.
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"...ridge reamer and ring compressor? Do they have tools like that?" |
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#8
04-22-2018, 03:04 PM
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Nice street 400.
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
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#9
04-22-2018, 05:06 PM
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Deep gear is the icing on the cake, should be fun.
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#10
04-22-2018, 05:38 PM
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Enjoy it, great street motor, Nice torque curve
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71 Goatman Hot Rods & Horsepower.......A diease for which there is no cure. 71 GTO, 463, SD 295 d-port heads, 10.75:1, RPM intake, 502hp/560tq @ the crank, 200r4, 10" Continental convertor, Bullet 234/244 cam, Cliff's Q-Jet, 3:42's w/Eaton True Trac, 5 Power Tours. New performance numbers coming 
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#11
04-22-2018, 06:46 PM
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[QUOTE=Squidward;5874003] Did it have a chance for tuning?
Yes, ignition and carb were tuned and several pulls made. Maybe different carb might give more power. With this combo this was best we could get.
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68 Bird
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