Thread: camshaft gear vs my timing cover

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Hello
So my question is about the thickness of the camshaft gear. I freshly built a 454 now a 463. new bottom end and full top end kit from edelbrock. i broke the engine in and noticed while on break in a wierd "tong" from the front of the engine. After break in I inspected more throughly for the noise and narrowed it down to the timing chain cover. now i removed the timing cover and found the camshaft gear hitting the cover slightly. I started inspecting everything. the camshaft is all the way into the engine. I was using a Edelbrock # 7810 true rolling chain which i was told was manufactured by cloyes. it came in the top end kit. i started measuring everything and found the camgear was 0.058" thicker than the roller set i took off orginally. orginal gear thickness was 0.554". the new gear is 0.612" the timing cover doesn't appear to have any warpage and the gear runs true with minimal runout when turned over. what is happening? edlebrock said that it would fit behind my stock oem cover. have you ever run into this problem? its a flat tappet cam. i've tried a cam button with no succes

If it was the cam walking the button should have stopped it. You could try an extra cover gasket and/or relieving the cover with a little hammer work. I'd run the button anyhow. Does your cam manufacturer recommend a bronze dist. gear? Hope this helps, Hank

some of the crome china built stock type covers do not fit so hot.did you check your top and bottom gear are they leve/ square if not you will have to fix this. if off no thrust button will stop this with a tin cover will just move .you did not say if you have a thrust shim under the top grear. you could add another timming gasket but then your button will not work with out some work .

so i got rid of the hitting problem. i used an aluminum timing cover. no mor hitting. now i have a bigger issue. #8 exhaust valve does not have as much lift as the other exhaust valves. it was starting to make noise after i fixed the timing cover issue. this is a # 7162 flat tappet edelbrock cam. i wanted a roller but this is how the top end kit came. this engine is driving me crazy. i will be pulling the intake tomorrow to check wear for a lobe worn off. it only has 2 hours of running time. this shouldn't be happening

any comments on flat tappets in big blocks, pat?

Originally Posted by skids72

any comments on flat tappets in big blocks, pat?

HEY YOU BE NICE AND YOU KNOW THE DRILL

Originally Posted by Jason383454

so i got rid of the hitting problem. i used an aluminum timing cover. no mor hitting. now i have a bigger issue. #8 exhaust valve does not have as much lift as the other exhaust valves. it was starting to make noise after i fixed the timing cover issue. this is a # 7162 flat tappet edelbrock cam. i wanted a roller but this is how the top end kit came. this engine is driving me crazy. i will be pulling the intake tomorrow to check wear for a lobe worn off. it only has 2 hours of running time. this shouldn't be happening

sorry to hear that . sounds like it wipe the cam .i have seen them go faster then that . i have built big blocks for many years it only takes one time .well for me four times over 20 years and many builds .never put flat lifter cams in big block chevys all roller cams solid or hyd

yeah well i agree now. i have seen the light( actually rollers!!!) so i have been in limbo back and forth with edelbrock today. i am getting the cam under warrenty. so thats good. i did order a hyd roller cam for it now. # 2261 edelbrock. now is looked wild at first until i started crunching the numbers it is a 236/245 duration. now that sounded good but its when i saw the lift i got worried. 0.625/0.639" crazy but it will work. 112 lobe seperation. now i think this cam is going to work for me just fine. it is a truck motor but its a multi purpose engine. has any one ran that exact cam or a cam with the same or close to specs?

yep over the years i built some engines with cams about that size looks alot like a howards grind i have used about 12 or so

have you recieved good results from them?

as a engine builder .i have used cams that size in hyd rollers and smaller cams to and bigger in solids rollers for street . they allways work much better then a flat lifter cams .that cam i would say will work . should make good number?for what you are doing with the truck what is that ??you will have to check your heads over for retainers to seals and guids .your piston to valve may be ok but i do not know what you have done to the engine pistons .heads valve size so this should be check for piston to valves

the heads are edelbrock performer RPM heads. this cam with work with all hardware installed in the heads. 2.19/1.88 and 290cc flow. the pistons are .210 dome pistons with valve reliefs. i should be ok for clearance. this is a 76 1 ton truck. it will be used for everything from driving daily to 4x4 to towing. i'm running a 2500 stall convertor so i can still have power in the lower rpm range. i'm running about 10.25 to 1 static compression.

i'm seconding question myself now. i should have enough valve clearance i belive. uh and i really don't want to remove the head. they are speed pro hyperutic pistons. everyone i've asked has said it will be ok but i am getting worried.