Thread: Hot Cylinder

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Hey guys just helped a buddy put his '66 Mustang back on the road. Had his 289 taken out to 302 and put some camshaft in it (268). Really snappy but have a problem. #4 cylinder is running HOT! Running a set of
Thorly tri y headers. Carb is Holly 600. Manifold Edlebrock. Timing is 10 deg. Manifold vac is 18. When we were breaking the cam in I checked all the cylinders with my Raytech and all were running approx 330 deg. # 4 was running 480 pushing 500 deg. Any thoughts?

Yes the push rods are correct. Not being a Ford Man we had it completly taken down to bare block and started from scratch. The motor came out of a 69 Torino. The only parts we used were the block, crank, and rods. New pistons, (rings of course) brgs thru out. Our local Speed Shop here in Norcal has a dyamite machine shop and I've known these guys for well over 30 yrs. They build everything from stock, mild street, boat mild to radical, miget, sprint, blowen to supercharged. (LJ's Speed & Marine). Bert the head man did some extensive work on the ports. Check for vacum leaks with gauge and sprayed everywhere. He only has one manifold vac port on the manifold. Carb new. 600 cfm I would think would be plenty. I'm at a lose. Just thought I would bounce this off you before I go out there today. thx

I assume you're getting a reading from the header tube. If the gasket leaks air into the tube it will read hot. What reading do you get off the spark plug?

Thanks people found the problem. When they set the valves cold of course #4 exhaust loose not getting full lift adjusted it and temp is good. Appreciate all the help.