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#1
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Std bore/stroke 400 - finally made a clean pass!
So my stock 4.120 x 3.75 400" motor made a clean pass, finally! Have been battling some valve train issues which i've now sorted out and first run of the night it went 11.4 @ 119.77mph. It backed it up with another 11.4 @ 118 and an 11.6 @ 119 when I was testing the 2-step launch (it spun..)
Car is 3850lbs with me in it. 400, with cleaned up round port e-heads (EHTTFMF!), victor EFI intake, Megasquirt 3X EFI, baby solid roller cam (255/262 @ 0.050 / 108LSA), Turbo 400 with a converter flashing to 4100, 4.30 gears with a 28" tyre. Have a few things to test as the logs showed I was pulling nearly 2" of vacuum at WOT and I forgot to take off the 11" x 1.5" air cleaner but it still did a reasonably well MPH for a car that is 95% street driven. I know it's nothing like you big dogs run, but it's all my broke azz can afford and a 400 is always the under dog Am hoping to see if I can get it to about 121-122mph then work on my 60' as i'm building a 4L80e box to replace the turbo 400 so the new converter will most likely be 5000-5200 in an 8" body.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser Last edited by krisr; 04-16-2019 at 07:33 AM. |
#2
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Wow very impressive!
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Chris D 69 GTO Liberty Blue/dark blue T400, 9" w 3.50s, 3905lbs 461, 850 Holley, T2, KRE 310s, Comp HR288 w 165s, RA manifolds, 11.60@114, 1.58/60 The spare: 467, 850 Holley, T2, Edelbrock Dport 310cfm w RA manifolds, HFT 245/251D .561/.594L, 11.59@ 114, 1.57/ 60' |
#3
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Nice Pass for a little engine.
How about a few pics of the car.
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66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 |
#4
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Impressive Kris. Good work!
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'65 Tempest 467 3650# 11.30@120.31 |
#5
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Sounds like a good combination. For 3800 plus pounds and only 400" those are really good numbers. Surprised that the Victor is working that well. Would've thought a little smaller intake would have been better for the number of cubic inches and relatively stock heads.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#6
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Wow, that is running very well.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#7
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Quote:
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#8
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#9
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Quote:
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#10
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Thanks mate! It's taken a while to work out, can tell you that much!!!
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#11
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Everything takes a while to work out the bugs and tune it right.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#12
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Pretty darn good!
GTO George |
#13
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Thats a cool car! Your times are very impressive considering running that tiny airfilter and also the soft 60ft. Awesome!
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#14
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Everything about it is impressive. All the numbers and the car itself.
BTW, How did you get a std bore 400 ? Sleeves ? 389 block ? Or just a NOS 400 block ? |
#15
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Cheers George!
Quote:
It's a '65 389 block that was taken out to take a 4.120 forged TRW. The only "thin'ish" area in the block was the lower thrust side of #7 so I filled the block up to the pump holes, re-checked the bores for round, nothing moved, so kept on putting it back together as it'd already been honed. The bottom end machine work was done around 10 years ago and the bores were still like new when I pulled it apart around 1.5 years ago for a freshen up so it just got a light hone for the new rings. The motor I'd rebuilt here in my garage other than getting the heads decked from 72ccs to about 56ccs to raise the compression to about 11.5:1 but that left me with no PTV so I ended up making some fly cutters using old valves so could recess basically 2.150" and 1.8" reliefs into each piston and cleaned them up a scotch brite wheel on a dremel so there was no sharp edges. Each piston assembly weighed before/after and they ended up within a gram of each other. I did a heap of machining and prep to everything to make sure that it'll take some abuse but also survive a lot of street miles as it's a street car, even has a child seat in the back as my 3 year old loves it (probably more than I do )
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#16
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Forged TRW, even more impressive.
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#17
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BTW, 11.5-1 ? What kind of fuel do you guys get out of the pump down there ?
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#18
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Our 98 RON fuel is probably the same as your 93 over there. The only time my car has any pinging issues is when it had iron heads and around 10:1 compression. The ignition map i've build for the car was a combination of a bit of dyno time, street time and track time. i.e. the car idles best with 30 degrees of timing, cruises with 46 and 38 at WOT from about 3500 to 7000. I attribute a lot of that to the camshaft I had custom ground to suit what I thought would run best. So far so good!
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
#19
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That is very impressive and good MPH too.
Damb good job bub. Love the car to it's really cool. GT. |
#20
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Quote:
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser Last edited by krisr; 04-27-2019 at 06:04 AM. |
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