I was checking my plugs last night for the first time after the motor has been put together and I noticed some plugs were darker than others. #1 and #4 were a dark tan, #6 and #7 were real dark and the rest were in-between. I've got a stock holley 750 vs (planning on switching primary jets from 72 to 70's), an old 327 style intake (no markings what-so-ever, dual plane polished with the oil fill provision in the front), camel humps gasket matched and bowls cleaned up, and short headers. I'm wondering if it is my "mystery intake". If you have any ideas let me know, but if you are going to flame my setup just go on to the next thread. Some of you guys are viscious.

 

Yes, it is.

That's one of the specific things that modern intakes have improved on, over those Stone-Age ones. As cheap as intakes are, get a better one, and move forward.

I'd suggest either a Performer or Performer RPM, depending on the usual considerations.

If it has a typical 327 cam in it, like the old crappy "375 HP" 151 cam, you can make a HUGE improvement by putting almost anything else in it. Your CR is kind of on the low side if your pistons are flat-tops, so don't get too carried away. Those heads, like almost any stock heads, flow worse on the exhaust than the intake, so a split pattern with a bigger exhaust lobe will help them work their best. Of course, the details of what cam to pick, will depend on the rest of the car and motor, and the application; but as long as you have those heads, that kind of puts an upper limit on the flow and RPMs you'll want to set it up for.

Actually, I'm not feeling very viscous today, I'm flowing rather slowly. Consider yourself lucky!!!

 

Thanks for the polite reply

The cam I am running is a Comp XE274 and have about 10:1 compression.

I even had to use a small distributer because a large one would hit the back runner on the manifold. If that doesn't age it. I think I would like to try an Air-Gap.