Finally Started the Head Swap! ~UPDATEwith video~

[det_riot]

No chip, It's at 14* of timing, its backfiring through the exhaust. I've got a shorter set of pushrods that I think I"m gonna try putting in. One of my car guys said it sounded to him like piston hitting the valve

 

[daves94vert]

What length pushrods are u using

 

[daves94vert]

I have 6.5 on mine. You need to measure with an adjustable pushrod to get the proper length.

 

[rz5.0]

what kind of heads are you running. you should always check pvc. you prob runing lean. its bad idea to just start trowing random pushrods. are you using the spark plug your heads call for.

 

[det_riot]

what kind of heads are you running. you should always check pvc. you prob runing lean. its bad idea to just start trowing random pushrods. are you using the spark plug your heads call for.

They're trickflow 170s with a 60cc combustion chamber, 7angle vj, and .650 lift afm springs. Yeah, i got the right spark plugs for the heads

 

[modo]

that motor doesn't sound good. are they pedestal or stud mount rockers? hard to tell from the noise but you either have seriously mis-adjusted rockers or something mechanically wrong. the popping sounds like a exhaust valve is hanging open on the power stroke


do not just start changing pushrods, you NEED to measure the proper length. if you have a p/v issue and are having contact you will more then likely need to buy some valves, and if your really un-lucky the cam could have a lobe issue

 

[det_riot]

They're stud mount rockers. I'm working on getting a pushrod length checker atm because I know if I don't it's just going to continue to fuck shit up. There weren't any issues with the cam before the swap so it's kinda odd that there would be an issue now.

 

[modo]

do you know how to properly adjust the rockers?

 

[det_riot]

I thought I did. They're stud mount. What procedure should I be using?

 

[modo]

lash depends on the type of cam you are using but when you adjust a particular rocker the lifter for that rocker needs to be on the heel of the cam. you will need to rotate the motor for EACH rocker. tighten the rocker to the specified lash for your cam and make sure the lock nut is turned with the nut at the same time for the final 1/4 turn. from the video it sounds like your valve adjustments are out to lunch

 

[F1atlander]

i see you are running an E cam, what rockers you have? 1.6 or 1.7? with those size valves and the Ecam on stock bottom end you are getting really close to the piston. i "play-dohed" my cylinder and i was very close!!! lets just hope its just a valve adjustment causing this and not a vavle touching.

i cant hear the vid here at work but im going to play it again when i get home.

 

[det_riot]

They're 1.6 rr's. I'm hoping it's just adjustment or pushrod and not touching because if it is I dont know what I'm going to do.

 

[daves94vert]

I described how to adjust your rockers on page 1.

 

[ttocs]

did you measure what length pushrods you needed or just slapped something in?

I had the same problem after a head/cam swap last year when a shop did it and they used the wrong length pushrods because they didn't measure. The motor blew on the dyno a week later after it was fixed, I always wondered if it was that time with the wrong rods that did it.

 

[det_riot]

I described how to adjust your rockers on page 1.

And that is the process that I used the second and third time so I'm going to assume this wasn't the issue and move onto the next problem.

I ordered an adjustable pushrod length checker so I'll keep you guys updated tomorrow with what I find out. Probably going to pull the heads off too to make sure that nothing was busted up from all of the clanking around.

 

[gregbar]

On my 349 with 1.7 scorpion arms I had to grind the corner off the four corner rockers to fit under the cover. I have adjusted my lifters twice and still not happy. My first was 1/4 turn too loose next was 1/2 turn noise went down but still a little noisey. MY next and last adjustment will be 3/4 turn. I have a thicker valve cover gasket installed.

 

[det_riot]

New update! got new pushrods in (the right length) Completely eliminated the horrible knocking sound. Only issue now lies in that popping/backfiring that is occuring. After timing it back to base timing (10*), it idles without backfires. Only backfire/popping occurs on initial start up and after blurping the throttle. I'd like to have it not backfire or anything before i take it out on a test run so I would like to figure this out soon!

 

[modo]

New update! got new pushrods in (the right length) Completely eliminated the horrible knocking sound. Only issue now lies in that popping/backfiring that is occuring. After timing it back to base timing (10*), it idles without backfires. Only backfire/popping occurs on initial start up and after blurping the throttle. I'd like to have it not backfire or anything before i take it out on a test run so I would like to figure this out soon!

if its more of a pop and it only does it then the motor is cold its probably a lean pop.

 

[Pure84GTT]

I would say the rockers need to be adjusted. I always go back after the first run to re check them and they always seem to have backed off slightly.

 

[det_riot]

if its more of a pop and it only does it then the motor is cold its probably a lean

pop.

How would I be able to determine if this is the only problem? Get it tuned? The only thing that worries me is that it only does the backfire/pop on the passenger side of the motor.

I would say the rockers need to be adjusted. I always go back after the first run to re check them and they always seem to have backed off slightly.

Well I've readjusted the rockers and put them back on a plethora of times, that with the combination of right size push rods fixed the ticking issue