Ready to install my new Q-jet and was wondering if there is any major difference whether I use a 4-hole gasket or the open type. I'm leaning toward the 4-hole because I'm using the TA performance dual plane intake and think the extra gasket material would seal better between the carb and intake. Thoughts? J-
I went to an Autozone and asked for a Carb base gasket. The guy gave me an open One. I told him I wanted a Four Hole. He said What's the difference. I looked at him and said if he didn't know the difference he shouldn't be working here. He got pissed and walked away. PONCH
Thanks for this. I posted a thread of my own about a week ago and got one response to use the open gasket on my stock manifold. I kind of thought the 4 hole was correct.
It won't hurt to use te open note stock intake but dont run te 4 hole on aftermarket because pieces of the gasket will end up in the motor if te gasket isnt trimmed out
Here's my concern with not using the 4-hole gasket. The attached photo of the dual plane intake shows it has a divider. So I thought that if I used the open gasket it would create a 1/16 inch gap between the carb and intake. So using the 4-hole gasket would fill that gap. Granted, I don't know if such a gap would have any adverse effects, but it deserved some thought. Thoughts?
For that intake, I would use a 4 hole to seal plenum divider and promote max torque and carb signal. Open gasket if you plan to run acarb spacer.
See that's what I was thinking. I thought I was being logical in my thinking. Just needed to confirm. Thanks Greg.
Keep in mind that with factory divorced choke set-ups, going to a thicker than stock gasket changes the relationship between the intake mounted choke and carburetor choke mechanism. Without changing the length of choke rod, the choke will take longer to unload, and may not work properly without adjustment, or getting/making a longer rod. I'm with Greg on the 4 hole gasket to improve "signal" to the carburetor, even when going to a thicker version. At most, on a stock type 4 hole intake, you might want to trim out a small piece between the secondaries. This allows the plenums to "see" each other, and can show a minor performance gain with some set-ups.......Cliff
