67 c10 283

[trockmalone]

Hello everyone,

I have a c10 1967 w/ stock 283. Going to freshen up the motor and stick with the 283. Even though a crate 350 is cheaper, everyone has 350s and I just love that little 4.6L. Couple of questions for the 283 gurus. Keep in mind this is not going to be raced. Just daily driver/cruiser. Here is a starting list of parts I am thinking of. Please let me know your thoughts as this is the first 283 I've done.

- COMP Cams CL12-242-2
- GM Performance 12558060
- MagnaFlow 16643
- Summit SUM-G9006-9

These Vortec heads any good? On Summit site it reads

They require the use of a Vortec-style intake and self-aligning rocker arms

Summit site says they will fit a 67 283. Anyone have any experience with these heads? Or any suggestions on cam choice, heads, or exhaust? Any thoughts/ideas would be much appreciated. I'm ready to get to work.

Thanks!!

[j_cst_10]

Can you list the specs on the parts so people don't have to look them up?

[trockmalone]

Sure!

- COMP Cams CL12-242-2 (Cam Kit)

Part Number: CCA-CL12-242-2
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,600-5,800
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 224 int./230 exh.
Advertised Intake Duration: 268
Advertised Exhaust Duration: 280
Advertised Duration: 268 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.477 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.480 in.
Valve Lift with Factory Rocker Arm Ratio: 0.477 int./0.480 exh. lift
Lobe Separation (degrees): 110
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.


- GM Performance 12558060 (Heads)

Part Number: NAL-12558060
Cylinder Head Style: Assembled
Cylinder Head Material: Cast iron
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 64
CNC-Machined Combustion Chamber: No
Intake Runner Volume (cc): 170cc
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Intake Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Location: Standard
Spark Plug Style: Straight
Intake Valves Included: Yes
Intake Valve Diameter (in): 1.940 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.500 in.
Valve Springs Included: Yes
Outside Diameter of Outer Spring (in): 1.250 in.
Damper Spring Included: No
Number of Springs Per Valve: Single
Retainers Included: Yes
Retainer Material: Steel
Locks Included: Yes
Lock Style: 7 degree
Valve Stem Seals Included: Yes
Valve Stem Seal Style: Umbrella
Rocker Arm Studs Included: Yes
Rocker Arm Nut Thread Size: 3/8-24 in.
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: No
Accessory Bolt Holes Drilled: Yes
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seats Machined: No
Valve Seat Material: Steel
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Quantity: Sold individually.
Notes: Requires Vortec-style intake manifold for installation.

- MagnaFlow 16643 (Exhaust System)

Part Number: MPE-16643
Exit Quantity: Dual
Exit Location: Split rear
System Material: Stainless steel
System Finish: Natural
System Style: Crossmember back
Muffler Included: Yes
Muffler Quantity: Two
Muffler Configuration: Single inlet/Single outlet
Muffler Style: Turbo
Exhaust Type: Dual
Hardware Included: Yes
Inlet Quantity: Dual
Intermediate Pipe Diameter (in): 2.500 in.
Tailpipe Diameter (in): 2.500 in.

- HED-69096 (Headers)

Part Number: HED-69096
Header Style: Full-length
Header Material: Steel
Header Finish: Ceramic coated
Primary Tube Diameter (in): 1 5/8 in.
Collector Attachment: Ball and socket flange
Collector Diameter: 3.000 in.
Tuned: No
Primary Tube Gauge: 18-gauge
Flange Style: Standard
Flange Thickness (in): 1/4 in.
Bolts/Studs Included: Yes
Gaskets Included: Yes
Reducers Included: Yes
Y-Pipe Included: No
Quantity: Sold as a pair.


Thanks in Advance!!

[j_cst_10]

I have a set of iron eagle dart heads which are in the same ballpark as the vortecs if you put the bigger 2.02/1.60 valves in it and i had that same exact cam but later changed it.

If you really want power convert to a hydraulic roller cam with around 235-240 degrees duration and buy the vortec heads from scoggin dickey which already have screw in rocker studs and larger valves. For a headers I would go to a 1 5/8 to 1 3/4 stepped primary full length header.Lastly, get an edelbrock rpm air gap manifold for vortec heads.

My Monte Carlo with this similar combo but with dart heads puts 350 HP to the rear wheels.

[j_cst_10]

Though mine wasn't a 283.......second thought keep the cam

[bhoeger70]

what is the use intended for the truck? That cam might be a little big for a 283 unless it is greared down (4.10-4.56 range). It is really easy to over cam a 283, try to keep the duration at 216 at .50 or less especially if it has the stock gearing.

[trockmalone]

Thanks for everyones reply. Opinions/Thoughts are much appreciated. Intended use for the truck is aggressive daily driver. Is there somewhere to look up what my stock duration is on my engine?

Thanks!!

[special-K]

Glad to here you`re keeping the 283.Is you`re truck manual or automatic?I think what I`d do is research the specs on the performance 283s and duplicate that.Like the 263horse 283.You can always bump it up a notch for a bit more power.The 283 likes the hign side of rpms and you may want to go for more bottom end than upper with a cam.I think with the weight o a truck,that`s where you`ll feel the modt improvement.Go for torque and the rest will follow,IMO.

[trockmalone]

Thanks man! To answer your question, it's a 3 speed manual. I'll check the specs on the ho 283's you mentioned. Never thought of that. I have had friends in the past put way too much cam in their engines and they sound great but are about useless unless you are at 4K RPM so I will go for the most torque I can get out of her! I'll keep you posted to my progress.

Thanks again!