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427 Build And Drag Test

General engine tech -- Drag Racing to Circle Track

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vortecpro
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427 Build And Drag Test

Post by vortecpro »

Recently I built a different kind of build, here it is. A 9.7 compression 427 BBC, I used a Autotec piston with a 1.5 1.5 3.0 ring pack. The heads were 1971 GM 820 castings, used only because I had them, 1.880/2.190 valves, ported. I used the 1966 factory GM Q-Jet cast iron intake with the Q-Jet, and a 1 inch 4 hole spacer was used. I wanted a smooth 780 RPM idle with 19-20 inches of vacuum, I wanted reliability so I chose the GM factory 390 HP 427/396 350 HP hyd cam. I had my cam grinder change the lobe separation from 115 to 112, specs: 216/218/460/480 I installed the cam on a 109.5 Intake centerline. My cam core was an 1960 GM cam core with 1970s TRW hyd lifters. I ran 110/290 spring pressure. I used Comp cams roller tip rockers 1.72 with a 3/8 .080 wall moly pushrod, with adjustable guide plates. A factory GM 4 quart oil pan was used. 10/40 Maxima oil was used. So my plan is to install this 427 in my 68 Chevelle and see how fast I can get it to go. Why I have no idea. Some pictures.
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vortecpro
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Re: 427 Build And Drag Test

Post by vortecpro »

Some more pictures.
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bob460
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Re: 427 Build And Drag Test

Post by bob460 »

Nice build =D> ......my guess 11.00 @120mph
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Re: 427 Build And Drag Test

Post by vortecpro »

Thanks-not sure about that 120 mph though.
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Re: 427 Build And Drag Test

Post by maxracesoftware »

vortecpro wrote: Tue Jan 12, 2021 12:12 am Thanks-not sure about that 120 mph though.
nice build pictures !

are you going to Dyno test your Engine before you install it in your Chevelle ?

do you "stake" the Cam sprocket at the Cam degree bushing hole ?
or is there a small outer lip edge on the bushing hole preventing possible degree bushing from falling out ?
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Re: 427 Build And Drag Test

Post by Monza355 »

Interesting for sure ! Did you dyno test the engine after the build ?

How’s the car going to be set up. Transmission. Gearing. Converter etc.. ?
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Re: 427 Build And Drag Test

Post by vortecpro »

maxracesoftware wrote: Tue Jan 12, 2021 3:04 am
vortecpro wrote: Tue Jan 12, 2021 12:12 am Thanks-not sure about that 120 mph though.
nice build pictures !

are you going to Dyno test your Engine before you install it in your Chevelle ?

do you "stake" the Cam sprocket at the Cam degree bushing hole ?
or is there a small outer lip edge on the bushing hole preventing possible degree bushing from falling out ?
I ran out of lock plates so I did put a step in the gear. I'am still testing carbs, I have two more to test. I also need to make a adapter so I can mount my air turbine. Heres were I'am at so far.
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Last edited by vortecpro on Tue Jan 12, 2021 8:11 am, edited 1 time in total.
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Re: 427 Build And Drag Test

Post by vortecpro »

Monza355 wrote: Tue Jan 12, 2021 6:29 am Interesting for sure ! Did you dyno test the engine after the build ?

How’s the car going to be set up. Transmission. Gearing. Converter etc.. ?
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Re: 427 Build And Drag Test

Post by vortecpro »

vortecpro wrote: Tue Jan 12, 2021 8:08 am
Monza355 wrote: Tue Jan 12, 2021 6:29 am Interesting for sure ! Did you dyno test the engine after the build ?

How’s the car going to be set up. Transmission. Gearing. Converter etc.. ?
I'am still thinking about that.
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Re: 427 Build And Drag Test

Post by motormonkey »

Nice. Other than weight, those gm cast highrise intakes weren't that bad compared to some aftermarket intakes. I liked the square carb pattern better tho.
Are you going to run the cast exhaust for the full sleeper effect?
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Re: 427 Build And Drag Test

Post by vortecpro »

No, it will have headers, 2 inch Hookers. For those interested observed or uncorrected or "in the room HP" was 361 @ 6388 Elevation, 23.76 baro. Another picture.
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Re: 427 Build And Drag Test

Post by My427stang »

Clearly working well to make that power with a "baby" cam. I may have missed it, but where did you end up for .006 overlap and resulting idle vacuum?
70 Mustang, 489 FE, TKO-600, Massflo SEFI, 4.11s
71 F100 SB 4x4, 461 FE, 4 speed, port injected EFI, 3.50s
vortecpro
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Re: 427 Build And Drag Test

Post by vortecpro »

motormonkey wrote: Tue Jan 12, 2021 8:20 am Nice. Other than weight, those gm cast highrise intakes weren't that bad compared to some aftermarket intakes. I liked the square carb pattern better tho.
Are you going to run the cast exhaust for the full sleeper effect?
Yes its heavy........this build was about using parts I had lying around that ordinarily would have never been used, I like projects, now I have this complete engine and I kinda like it! Thats how the 327 shop truck was built as well.
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Re: 427 Build And Drag Test

Post by vortecpro »

My427stang wrote: Tue Jan 12, 2021 8:30 am Clearly working well to make that power with a "baby" cam. I may have missed it, but where did you end up for .006 overlap and resulting idle vacuum?
The idle vacuum @ 780 RPM was 14.8 inches @ 6388 feet elevation, I think it will go 19-20 down low. Dead smooth idle @ 780 RPM.
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Re: 427 Build And Drag Test

Post by tenxal »

Have you ever run a QJet with your air bonnet on?

The 2006 date on the dyno sheet is interesting.
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