period correct tunnel rams

[TheNovaMan]

The reason I ask is this:

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Da Grump (in The Chevrolet Racing Engine)</div><div class="ubbcode-body">The 4224 idle circuit requires some &quot;fixing&quot; in order to achieve a clean idle with a radical engine. The idle circuit in the number 5913 primary metering block supplied with the 4224 was originally designed for a carb with a power-valve system. The 4224 doesn't have a power-valve circuit and the idle circuit may be very rich with the normal race engine idle settings.</div></div>
And then he goes on to the bit about the 0.017&quot; diameter wire in the idle feed restriction. I was reading that the other night, and I thought &quot;why not just put a power valve in it then? I drive on the street, and it might cut down on some unnecessary fuel consumption while cleaning up the idle and off-idle mixtures at the same time!&quot;

I don't experience backfires very much, but I figure I'd probably install power valve protector check valves while modifying the carbs for power valves.

[Hemicolt]

Power valve circuit should help you.
When we ran the 540 on the dyno, the A.F. ratio was down in the 11.0 range. Way to fat for a street car. Bobby Myers added a power valve to the Dominator by removing the block off and drilling two holes into the metering plate to feed fuel to the power valve. After moving down 4 jet sizes, the average A.F. ratio was in the 14.5 range at idle and through the pull.

[Plowman]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TheNovaMan</div><div class="ubbcode-body">The reason I ask is this:

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Da Grump (in The Chevrolet Racing Engine)</div><div class="ubbcode-body">The 4224 idle circuit requires some &quot;fixing&quot; in order to achieve a clean idle with a radical engine. The idle circuit in the number 5913 primary metering block supplied with the 4224 was originally designed for a carb with a power-valve system. The 4224 doesn't have a power-valve circuit and the idle circuit may be very rich with the normal race engine idle settings.</div></div>
And then he goes on to the bit about the 0.017&quot; diameter wire in the idle feed restriction. I was reading that the other night, and I thought &quot;why not just put a power valve in it then? I drive on the street, and it might cut down on some unnecessary fuel consumption while cleaning up the idle and off-idle mixtures at the same time!&quot;

I don't experience backfires very much, but I figure I'd probably install power valve protector check valves while modifying the carbs for power valves. </div></div>* Also a vacuum advance helps clean up the idle with Tunnel Ram too.