Pipe glowing red, need help

[84Dave]

The purpose of the power-valve is to make additional fuel available through the carb from mid to high rpm & WOT demands. Remove the power valve & that additional fuel requirement must be made available by increasing the size of the main fuel jets. However, that also means the carb may run too rich @ light-to-medium throttle settings. Which means there can be detrimental results with regard to the fuel-curve/BSFC across the engine operating rpm band. Whether partial or full-throttle. Additionally, for those using the 500 Holley 2-bbl, the power-valve-channel-restrictions (PVCR) are very near .060" diameter. Fine for a high-power V-8, but WAY too large for the typical 4-cylinder using a power-valve. Those channels should be jetted back into the range of about .040" diameter for the typical 4-cylinder. I don't remember the diameter of those channels in a 'stock' Holley 350. -Dave-

[CushionArtist]

Dave,

Thanks for all the help. I'll have to bring this up with my carb builder.

Good news is, we won our feature last night. Engine only missed one time when I hit about 8500 RPM. Once the track slicked over, we weren't turning it nearly that high.

Bad news is, the pipe still glowed a little in the feature. I think it's close enough now, that it is a minor jetting or slight cam adjustment. Either that, or it's pullover.

Thanks for all the help from everyone. Next question is where can I buy the anti pullover part?

[SLYDIRT]

Ess pulley

are all (4) pipes on the header glowing red? If so, a fuel mixture problem? Fuel pull-over within the carb(booster, squirters, transfer slot?) or........ If you haven't done so, use a piston stop in the head plug hole on #1 & make certain the front pulley is indexed properly for tdc, so ignition timing will be proper. We recently checked the esslinger pulley on front of an early 2.0l pinto engine & it was in error by 5-degrees! With the engine warm, a static compression check of all (4) cylinders? -dave-

i have the same prob with the glowing header how exactly would i check for the pulley being off 5 deg i am new at this kinda stuff thanks for all info

[84Dave]

Go to a parts store & buy, or borrow one from your engine buddy, a 'piston stop'. It's a device that threads into the sparkplug hole in the head. In the center of the piston stop is an adjustable 'plunger'. Adjust the depth of the plunger until it contacts the piston just before TDC. Use the 'stop in the #1 cylinder plug hole. Before you begin, tighten the cam belt good & tight. Rotate the engine CW until the piston is about 1" down the bore from TDC, with both valves closed. Install the 'stop. Continue to rotate the engine CW until the piston hits the 'stop. At that point, scribe a mark on the front pulley in line with the pointer. Then rotate the engine CCW until the piston again hits the 'stop. Scribe another mark on the pulley. If the original mark on the Esslinger pulley is in the correct position, it'll be exactly centered between the (2) scribe marks you made on the pulley. If it's not, you have (2) options. Change the position of the ignition timing pointer screwed to the block, or file a new mark on the Esslinger pulley for TDC. If in doubt, get some help from your engine buddies! -Dave-