In switching out an Autolite 2100 with a Holley 0-7448 (350 cfm) carb do I need to keep the spacer? This is on a 68 302 2V. Holley makes a thinner spacer/gasket (.31") that comes with new studs, so if the OEM spacer isn’t necessary then I’ll probably go with that since I’ll need new studs anyway. Also, if anyone has done this, was it a problem routing the fuel line to the passenger side? I’m assuming it won’t be something that cant be solved with an extra length of tubing.
The factory 1 inch spacer has the vacuum port for the PCV valve on the valve cover.
Besides that, its typically advisable to utilize the tallest spacer that allows everything to fit under the hood. A taller spacer increases the runner length between the carb butterflies and intake valves, and that aides torque and low to mid-range power.
Also, although its more trouble, I’d strongly advise running a new metal line from the fuel pump to the carb. Pressurized gasoline running through rubber hose on top of a hot engine should be minimized as much as possible.
Forgot about that PVC port. CJ- it’s all metal up to the point where I have the fuel filter. I don’t know of another way to have the filter inline. It’s a black reinforced hose I’m using.
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So the Holley has a PVC port built into the base. So my question remains - is the spacer needed? I suppose I can just plug one of the ports, but if so it would probably be the one off of the spacer. I ask because I’ve heard various reasons for the spacer regarding improved performance.