'68 318 to carbed Magnum 5.2: Check my checklist
When I pulled the heads off last night, I was too utterly tired to realize this discovery:
The stock lifters and pushrods are oil-through units:
Despite this, the conventional rockers have no oil hole, as you've seen in the earlier photos. Go figure.
Between this and the oiling mod in front of the engine, I'm starting to think that the late-model, roller-cam 360-3s were somehow testbeds for the eventual Magnums.
I'm going to measure the pushrod length, check those lifter part numbers, and maybe even have a look at the camshaft lift, because I don't trust anything about what's supposed to be in this engine at this point - it's already bucked that trend nicely. Just for the record, it's an LA block all right (block casting 4315830); so it's not some sort of hacked-together warranty short block.
EDIT: Pushrod length is 6.75", and correlates with a roller LA.
EDIT #2:
According to a forum member (67Barracuda), stock cam specs are as follows:
Lift Duration Installed CL
89-91 360 .391/.391 240/240 ???
5.2 Magnum .432/432 251/264 115
5.9 Magnum .410/.417 249/269 117
Intake cam lift on my 360 at is 0.272 at the lifter. Figuring the 1.5 rocker ratio of the standard LA rockers, that works out to 0.408 lift with the setup now.
Exhaust cam lift is 0.258; at 1.5, that'd be 0.387 lift.
Now if we take those specs and apply them to a 1.6 rocker ratio:
0.272 x 1.6 = .435
0.258 x 1.6 = .412
Well, it doesn't match up to any of the stock specs...
-Kurt
When I pulled the heads off last night, I was too utterly tired to realize this discovery:
The stock lifters and pushrods are oil-through units:
Despite this, the conventional rockers have no oil hole, as you've seen in the earlier photos. Go figure.
Between this and the oiling mod in front of the engine, I'm starting to think that the late-model, roller-cam 360-3s were somehow testbeds for the eventual Magnums.
I'm going to measure the pushrod length, check those lifter part numbers, and maybe even have a look at the camshaft lift, because I don't trust anything about what's supposed to be in this engine at this point - it's already bucked that trend nicely. Just for the record, it's an LA block all right (block casting 4315830); so it's not some sort of hacked-together warranty short block.
EDIT: Pushrod length is 6.75", and correlates with a roller LA.
EDIT #2:
According to a forum member (67Barracuda), stock cam specs are as follows:
Lift Duration Installed CL
89-91 360 .391/.391 240/240 ???
5.2 Magnum .432/432 251/264 115
5.9 Magnum .410/.417 249/269 117
Intake cam lift on my 360 at is 0.272 at the lifter. Figuring the 1.5 rocker ratio of the standard LA rockers, that works out to 0.408 lift with the setup now.
Exhaust cam lift is 0.258; at 1.5, that'd be 0.387 lift.
Now if we take those specs and apply them to a 1.6 rocker ratio:
0.272 x 1.6 = .435
0.258 x 1.6 = .412
Well, it doesn't match up to any of the stock specs...
-Kurt