Join Date: Nov 2002
Location: Ontario & Oceanside CA.
A friend of mine called me with a problem and asked for my help with his 81 Corvette. He has a mildly modified 350 in it that was recently rebuilt with flat top pistons, about 10:1 compression and a mild cam. He had the bottom end done at a local engine shop and he finished the engine off himself. Cam and related parts were installed by him. Some of the mods are #186 double hump 2.02 heads. A MSD distributor with 6AL box and a Blaster SS coil, and a new Demon 650 Vac sec carb. I was introduced to this at this stage and was expected to diagnose the problem of low (and I do mean LOW) power. Everything checks out. Carb is good, ignition system is good, timing is on the money. And I'm taking his word (or at least I did)on correct cam timing. (he said he aligned the marks on the gears.) I've tried everything. Moving the timing because of the possibility of a incorrect timing pointer or slipped harmonic balancer ring and just about everything else. The engine runs not too badly. The cam, (a mild cam i'm told) sounds like a top fueler at idle. I'm at a loss to find a logical problem. I did a compression test. I got a whopping 220 PSI. I suspect the cam is advanced. Normally I would just pull this thing apart and have a look but the reason I'm fishing for suggestions is because this car has had some extensive suspension and steering mods and in order to have a look at the timing chain, the motor has to come out! No room! So before I pull it, I thought I might just ask some of you guys what you think?