I've been in the tech area alot lately at a local track. They have a pretty much strictly stock class there. The rule says must run an open chamber heads. One of the gray areas has been a 305 head on a 350. This is what the track says. The 305 chamber fits the cylinder on a 305, but on a 350 it overlaps the cylinder, and makes it a closed chamber. Is that so? I know a double humped head is a closed chamber head, but some of the guys being dq'd say that the 305 head isn't a closed chamber head, but rather a small chambered head. The track says that's the case on a 305, but it becomes a closed chamber on a 350. The track also says a 350 head such as a 487 won't run good at all on a 305. Is that so? Also some of the guys that run 350's are alledging that the some of the guys running blocks with a 305 number on them and a 305 head could be boring them out to 350. Now I know that the catings in those 2 blocks are different and the cylinder walls would be too thin, but some of them are claming that some of the 305 blocks can be bored out to a 350. Is this true?
I've seen things like this before. 78-86 GM passenger cars with a metric frame are supposed to be automatic, a no disc brakes on the back. That's what most people say anyway. Well, my friend has a 78 Monte Carlo that come stock with a standard tranny in it. The Floorboard is prepared for it and everything. My neighbor has a Buick Grand National, and it has stock disc brakes on it. By the way, that's a V6, and it will fly. Could possibly an early 305 have been just a smaller bored 350?
I've seen things like this before. 78-86 GM passenger cars with a metric frame are supposed to be automatic, a no disc brakes on the back. That's what most people say anyway. Well, my friend has a 78 Monte Carlo that come stock with a standard tranny in it. The Floorboard is prepared for it and everything. My neighbor has a Buick Grand National, and it has stock disc brakes on it. By the way, that's a V6, and it will fly. Could possibly an early 305 have been just a smaller bored 350?