427 Progress - Chevelle Tech
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post #1 of 4 (permalink) Old Apr 27th, 12, 1:34 AM
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427 Progress

After a few years of working on everyone elses hotrods I'm finally making some headway on my '69 Chevelle.

427 +.030. TRW L72 pistons. ~9.65-1 compression with 119cc chambers. OEM rods with good bolts, OEM forged crank, 2 bolt block.
This has been a reliable solid running combo in the past. I used to daily drive the car.

It's getting updated to a Cam Motion HR 236/240 110 LSA .612/.596 cam, Morel rollers, Comp Ultra Magnum rockers.

The heads came in today. Profiler 290 cc ovals (Jeg's). I'm planning to do some very minor work to clean up the ports, check the guide clearance, valve job, chamber cc, install some titanium retainers, check the springs, etc.

The intake is a Edelbrock Vic. Jr EFI with a FAST 1375 cfm throttle body. Injectors will likely be 48 lb/hr. Looking at the Holley Dominator controller so it can run the 4L80E as well.

Planning on Stainless Works headers running through the existing 3" exhaust (probably upgrade to a stainless exhaust eventually).

Overall a pretty tame driveable 427. I hope to make it run solid mid 11's through the mufflers on drag radials.

Anybody want to make suggestions on the head/intake port configuration.
I know the Profiler heads like their own intake, the Vic Jr I have is a rect port. I plan to look at them tomorrow when I get some gaskets in hand.

I know the rect port intake/ oval head combo works fine, and this is obviously not an all out combo with the baby HR cam. Is it worth doing anything to the heads or intake to help match them up, or just run with it?
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post #2 of 4 (permalink) Old Apr 27th, 12, 9:16 AM
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Re: 427 Progress

Glad to hear that you get to work on your own project. Hope you are able to get it up and running soon and enjoy some of the summer. I have seen a set of oval port heads that had been matched to a rect intake, pretty ugly. I have never done it or played with a flow bench to see what would happen, but would think that some light radius around the port may help against some reversion? Hopefully somebody more knowledgable will chime in. I just want to see your post stay up top and not get missed, you help way to many of us. Thanks Jake

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post #3 of 4 (permalink) Old Apr 27th, 12, 11:17 AM
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Re: 427 Progress

Jake, not being in my range of expertise, I did nothing to attempt to port match the oval heads and old skool rectal tripower. Low speed seems fine. Thea heads dont carry much past the mid 6000 range, and it may be that port match issue or the untouched oval intakes. Nevertheless, this occurs above the range you'd likely push the HR cam anyhow.

The only thing I was tempted to do ( and I did roll the ports, more like deburr the entrace) is to cut some sort of cathedral at the top where the charge hits a wall, literally. But.... nothing is better than removing metal I cant put back.

BTW, Mr Gasket UltraSeal 5828 is the ticket.


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post #4 of 4 (permalink) Old Apr 27th, 12, 12:06 PM
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Re: 427 Progress

FWIW ....... as Gene said leave it as is .........I have a 396 going back together right now with factory ovals and factory 063 rect intake & new mild HR .......it ran that way for years with 3 .73 and flat tappet cam ......no botttom end loss and improved top end ran low 12's back inthe day

Looks like a nice combo on your 427 good choice on cam spec .................dont see any reason why it wont run just over the roll bar rule ....... BTW cr 9.65 with 119cc heads .can I assume that pistons at zero deck to get that cr

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