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  #1  
Old 04-18-2018, 11:16 PM
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Default installed new cam and now a miss

So ill keep it short.

I bought the comp cams dual energy 265DEH-10 kit with timing chain and valve springs. This is a mild cam only one step up from the rv cam. it sounds epic btw. but it seems to idle ok ish... but when crusing at any speed it feels like it has a miss. there is no backfiring or anything like that.

When i did this i installed new head gaskets and the rest.

i instaled a new distro and carb thinking maybe it was related to that. didnt really fix the issue.

I quad checked the timing and it seems good. Although i am not sure which port on the edelbrock 1406 carb to use for the vacuum. the full manifold vacuum makes the timing jump to like 42 degrees at idle. from a set point of 10 degrees. i have tried both full and ported and neithter seem right to me but i think theres other factors at play.

I have check compression and it is the same before and after the new cam.

Any ideas would be helpful.
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  #2  
Old 04-18-2018, 11:22 PM
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Also i dont hear any ticking noise and none of the pushrods are loose. I was very careful to make sure all pushrods went back in the correct locations.
i used the proper camshaft break in oils and additives.

I just pray its not a wiped lobe. i feel like it would make a noise or something if that was the case.
Also switched to an electric fuel pump and removed the mechanical.
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  #3  
Old 04-18-2018, 11:50 PM
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Quote:
Originally Posted by StealthSRT10 View Post
Although i am not sure which port on the edelbrock 1406 carb to use for the vacuum. the full manifold vacuum makes the timing jump to like 42 degrees at idle. from a set point of 10 degrees. i have tried both full and ported and neithter seem right to me but i think theres other factors at play.
I've always used the full vacuum port and never had an issue. That's what Edelbrock recommends for non-emission controlled engines.

John
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Old 04-19-2018, 12:05 AM
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Quote:
Originally Posted by StealthSRT10 View Post
Also i dont hear any ticking noise and none of the pushrods are loose. I was very careful to make sure all pushrods went back in the correct locations.
A pushrod that's too long won't necessarily tap but it will prevent the valve from closing correctly. Anytime you replace a camshaft you should to check the valve clearances. You can't assume that the specs are going to be the same as the factory cam. Pushrods come in different lengths for a reason.

John
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  #5  
Old 04-19-2018, 12:50 AM
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that had crossed my mind. I am plannin on getting a dial indicator tomorrow.
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  #6  
Old 04-19-2018, 02:34 PM
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Quote:
Originally Posted by StealthSRT10 View Post
that had crossed my mind. I am plannin on getting a dial indicator tomorrow.
Before that do a compression check, it might point the way to the faulty cylinder if there’s one noticeably lower than the others.
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Old 04-19-2018, 03:20 PM
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I would try cleaning out the carb as well. The 1406 top comes off with the torque bolts really easy. You may have gotten a piece of fuel line or some casting caught in the passages. (New electric fuel pump and carb)In my case it was rust build up caught in the float screen that made it past 2 filters. The entire drivers side float wasn't filling fast enough at open throttle.
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Old 04-21-2018, 03:48 PM
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compression is good slightly higher if not the same as i reseated the valves.

Shouldnt be a factor with rust all new tank and hoses.

Checked and looks like i may need slighty shorter push rods.
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  #9  
Old 04-22-2018, 05:16 AM
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Did you degree the camshaft when you installed it?
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  #10  
Old 04-22-2018, 02:16 PM
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I dont have a degree wheel so i didnt. I checked the push rods by measuring each one and then sharpie the top of the valve stem and turning the engine over a few times. Looks like all of them need to go down one size. I ordered new push rods and they should be in in a week or so. Im going to check over the carb in the meantime but if this doesn't solve most of my issue then i will be pulling the cam out to meausre all the lobes to see if any of them are flattened.

i ordered rods 0.05 inch shorter. I will install all of them and do the sharpie test again to make sure the contact patch is the best possible.

Any other ideas are always welcome.
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