427 Build And Drag Test
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427 Build And Drag Test
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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Re: 427 Build And Drag Test
Some more pictures.
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Re: 427 Build And Drag Test
Thanks-not sure about that 120 mph though.
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Re: 427 Build And Drag Test
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 ?
Re: 427 Build And Drag Test
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.. ?
How’s the car going to be set up. Transmission. Gearing. Converter etc.. ?
Re: 427 Build And Drag Test
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.maxracesoftware wrote: ↑Tue Jan 12, 2021 3:04 amnice 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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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
I'am still thinking about that.
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Re: 427 Build And Drag Test
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?
Are you going to run the cast exhaust for the full sleeper effect?
Re: 427 Build And Drag Test
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
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?
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Plattsmouth, NE
70 Mustang, 489 FE, TKO-600, Massflo SEFI, 4.11s
71 F100 SB 4x4, 461 FE, 4 speed, port injected EFI, 3.50s
Re: 427 Build And Drag Test
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.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?
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Re: 427 Build And Drag Test
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.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?
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Re: 427 Build And Drag Test
Have you ever run a QJet with your air bonnet on?
The 2006 date on the dyno sheet is interesting.
The 2006 date on the dyno sheet is interesting.