SUM-k1202 cam in ’84 c10

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letgomyleghoe

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shawn
Truck Year
1974
Truck Model
c10
Engine Size
350ci
Hi,
I’m planning out a build for my ’84 c10 with 350/th400 and a 12 bolt 3.08 posi rear end, I have 27 inch tires and will be installing aluminum 64cc heads to boost my compression up to about 9.5. This will be a weekend car for the most part, I have a van I use for work. Will this cam still be “street able” or should I look for something a little less hot, I would still like to able to drive this thing on 1-2 roadtrips every once in a while.

Cam is 4/7 swap
218/228 duration
109lsa
.465/.473 lift with 1.5 rockers
 

xm20k

Runs on 93 octane, caffeine, and spite
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Thats practically stock compared to the one I drive daily in the summer. You'll still have vacuum brakes too.

11.25 compression
252/252
110
.600/.600

4000 stall
457 gears on a spool
32 inch drag radial
 

letgomyleghoe

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Location
Milwaukie, OR
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shawn
Truck Year
1974
Truck Model
c10
Engine Size
350ci
Thats practically stock compared to the one I drive daily in the summer. You'll still have vacuum brakes too.

11.25 compression
252/252
110
.600/.600

4000 stall
457 gears on a spool
32 inch drag radial
Yeah I’m hoping to keep it right in the middle, not hot but not mild. I’m open to swapping to a higher stall converter, I just want to keep the 3.08 posi rear end as a majority of my driving style is backroads and highways >60mph. I’m thinking I’m gonna go 1.6 ratio rockers which will put it at .504 lift intake side. Do you think I’ll need a higher stall converter with 1.6 rockers? Or should I send it and expect to possibly be swapping the converter.
 

xm20k

Runs on 93 octane, caffeine, and spite
Supporting Member
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Location
Girard, Ohio
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David
Truck Year
78
Truck Model
c10
Engine Size
388
Yeah I’m hoping to keep it right in the middle, not hot but not mild. I’m open to swapping to a higher stall converter, I just want to keep the 3.08 posi rear end as a majority of my driving style is backroads and highways >60mph. I’m thinking I’m gonna go 1.6 ratio rockers which will put it at .504 lift intake side. Do you think I’ll need a higher stall converter with 1.6 rockers? Or should I send it and expect to possibly be swapping the converter.
That duration shouldn't be ratty enough to need a converter, it'll idle with a bit of a lope, have vacuum for power brakes. Decent upgrade from the stock cam for daily use I'd run it with your planned build.
 

letgomyleghoe

Junior Member
Joined
Jul 10, 2024
Posts
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Location
Milwaukie, OR
First Name
shawn
Truck Year
1974
Truck Model
c10
Engine Size
350ci
That duration shouldn't be ratty enough to need a converter, it'll idle with a bit of a lope, have vacuum for power brakes. Decent upgrade from the stock cam for daily use I'd run it with your planned build.
Sweet thanks for the input!
 

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