Join Date: May 2007
Location: Baltimore Maryland
Re: Please help! odd SBC oil leak
I agree with deerhunter. If you are getting oil on your lower hose, then it's leaking from the front and being blown back to the starter area. I had the same issue as you. If I drive normal, no leak, but the minute I put her through her paces, she leaked. They make two different thickness front seal 1pc rubber pan gaskets. The earlier engines(55-74) use the thinner front seal(part #OS34509T). The later engines(75-on) use the thicker front seal(part #OS34510T). If you have an earlier engine, unless you are using an OEM pan or the original, you need to call the manufacturer and ask whether or not it uses the thin or thick front seal. Most tell you in the instructions. For example, my 67 has a 71 small block, but I run a Milodon 7qt pan that requires the thick front seal. You can't assume because when you look at it, it appears to be making the proper contact. The difference is significant, but with the pan bolted up, it's hard to know for sure. Also, did you make sure you used RTV on the corners of the of the gasket? Some can get away without it, but I haven't seen one that could. Mine has ALWAYS required RTV.
Also, like SSDoug said, check the bolt hole on the front of the engine that leads to the fuel pump push rod. There should be a bolt in that hole. Even if there is one, pull it and inspect the threads. Clean and reinstall with some sealer.
Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)