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Old 01-09-2013, 12:33 PM
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Edelbrock C427x manifold

Hey I found an old Edelbrock C427x intake manifold & was thinking about using it with my 454BBC. I'm a younger guy & don't really know to much about it other than the things I've heard about it (it was used on the super cars & they ran low #'s) so I'm looking for some more insight on this manifold so I'll if it would be a good addition or not, thanks...

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Old 01-09-2013, 01:09 PM
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what does your 454 consist of inside?
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Old 01-09-2013, 01:31 PM
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As of right now it's stock as far as I know, I bought it used but its very clean & the guy said it MIGHT hav been went thru already but he neva got a chance to see due to his project being stolen. I was looking to go with a .60 over bore with a street cam
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Old 01-09-2013, 01:39 PM
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you need to decide what you want from your engine,and match the parts.Make a list quick before tech gets here.
Ill mess with his coming post
Its all about combination,combination,combination,combination
If you want 375 horse power then all the parts need to be geared to make 375 HP,heads manifold,cam.carb and exhaust
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Old 01-09-2013, 02:02 PM
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I was lookiI was looking to get as much hp as possible without doing to much of extreme mods, jus simply heads IF needed, cam, and the .60... Just going off those few things if I was to get the right parts matching like yu say ABOUT how hp would predict I could get out of the motor?
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Old 01-09-2013, 02:13 PM
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I just got these #'s directly off the motor; Block # 361959, Intake#3883948, Heads#336781. Can yu tell me anything based off these part numbers? Any insite would really help, like I stated before I'm a young guy (25) and this my first time dealing with a big block.
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Old 01-09-2013, 06:23 PM
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I see no reason for you not to be able to make 375 horse power. bolting on just 1 part is not the answer.

good headers and exhaust first,manifold/cam/ignition will be the next step
Budget will determine what you can buy
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Old 01-09-2013, 06:40 PM
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That old intake is more or less an early 375-425 horse GM intake copy. If I remember correctly a big cap HEI unit won't clear the end runner.

A good budget street intake. Similar to a Edelbrock Performer.

If you bore it, get a mid dome piston 9-10 to one compression. A mild cam, headers and a 780 vac secondary carb, you will have a torque monster.
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Old 01-09-2013, 09:35 PM
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Okay well the same guy says he has a set of GM part number 3964291 rectangle port heads & I found anotha guy with NEW ROSS RACING PISTONS ALUMINUM FULL FLOATING. CNC. MACHINED. SKIRTS THAT ARE. 060 454 OPEN CHAMBER PISTONS PART #80001,NEW EAGLE H BEAM RODS PART. #CRS -6135-S, and SPEED-PRO RINGS... How does this setup sound for horsepower?
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Old 01-09-2013, 09:43 PM
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decide on square or oval heads
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Old 01-09-2013, 10:00 PM
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Edelbrock C427x manifold

You don't say what you are going to use this engine in. First you need to have the block and heads checked out at the machine shop. It would be best to bore it .030 and zero deck the block if it is stock. Check the valve size in the heads. They would be better with 2.19 intake and 1.88 exhaust valves. This engine can produce about 400 hp and 510 lbs. torque with the parts I have listed. Factory crank, factory rods with ARP bolts, KB201 .030 pistons, XE274-3 11-246-3 Comp Cam, factory heads 781's, Fel-Pro Q1071 head gasket, Edelbrock 7161 intake, Demon 1563010VE vacuum secondaries carburetor.
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Old 01-09-2013, 10:23 PM
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Edelbrock C427x manifold

Quote:
Originally Posted by MalibuMike View Post
Okay well the same guy says he has a set of GM part number 3964291 rectangle port heads & I found anotha guy with NEW ROSS RACING PISTONS ALUMINUM FULL FLOATING. CNC. MACHINED. SKIRTS THAT ARE. 060 454 OPEN CHAMBER PISTONS PART #80001,NEW EAGLE H BEAM RODS PART. #CRS -6135-S, and SPEED-PRO RINGS... How does this setup sound for horsepower?
You have one of the best oval port heads GM produced. The 781's would be better for a street engine.
Those Ross pistons would give you a 13:1 compression ratio which will not run on pump gas. The rods are not needed on a street driven engine, its just overkill.
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Old 01-09-2013, 10:37 PM
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Okay cdminter59 since yu say those oval port heads are sum of the best if I was to go .60 bore what size cam would yu suggest I use to get the best output? I'm just trying to find a few different part combinations to go with for the best price.
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Old 01-09-2013, 10:52 PM
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what is the engine going into? a car/truck/boat?
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Old 01-09-2013, 11:05 PM
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1980 2dr Malibu with a TH400 transmission & 8.5" posi rearend with 3.73 gear
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