I started a thread last week about a knock in my '67 327 in the engine forum. After inspection, it was determined to be a rod bearing issue with the number 8 rod bearing. It spun and both halves nested on the rod side of the crank. The number 7 rod bearing was missing a chunk of material as well, but had stayed where it belonged. This left some marks on the crank, but it looks to be rebuildable (see photos)
Now, by the numbers (V05I8KM), this was an L30 spec (275hp) engine. Code Year CID HP BBL Appl KM 1967 327 275 4 a/t, A.I.R.
Well, that's what it started life as. When I took it apart, I found +.030 flat top pistons and a Viking 100H cam. Crank main and rod bearing do not show any +\- numbers, so I am assuming they are standard, but the rod journals will need to be ground due to current damage.
I have the double hump heads (3890462) and cast iron 4 bbl intake (3895898 or 3895893, I'm not sure), RamHorn manifolds and dual exhaust through Magnaflow mufflers that exit in front of the rear tires.
What I would like to do with this engine is build it up to the L79 spec. (327/350hp)
I know that the block is a 2 bolt main, but I don't think any of the small journal 327 were 4 bolt mains. Does this sound like a good decision for this block? Should I go to the L79 spec, complete with dome pistons to up the compression to the factory rating of 11:1, build using flat top pistons and keep the lower compression (L30 was rated at 10:1), or do the regular rebuild using the full L30 spec? It will be going back into my '62 C10 Shortbed Stepside. I have the SM420 4 speed and a non-posi 3.90:1 rear end. I am using a Holley Mdl 4175 650cfm spreadbore for the carb.
I don't know what the difference is between the factory cam for the L30 and the Viking 100H cam, but I did like the power it produced. I would prefer to go to the full L79 treatment, but am concerned about running pump gas in it. I was currently using 87 octane regular unleaded with no pings or pre-detonation. The current +.030 have L2165 on the deck along with the 030. This leads me to think they are TRW forged pistons and correct for 10:1 CR with the 64cc heads. Would the L79 cam (3863151) or any of the current cams with a similar grind (Elgin E903H, CompCams CCA-CL12-106-3, etc..) really help at 10:1, or is the compression too low to add any benefit?
