Bent puhshrods + busted tappet = not good...

Fireman450

Fireman450

Daring to be diffrent!!
Joined
Nov 24, 2007
Messages
1,606
Well I fianally got my cam in and put it in the truck last night. Went in really well. Got all the timing marks where they should be. Took the rockers off one set at a time and installed my pushrods, set the valves really loose first time around. Went to turn it over by hand with a wrench on the end of the crank to make sure nothing bound up.... Well as we turned it around it did get a little tight but nothing that i really worried about, then it came on past it pretty easy. I thought it might have just been my springs or somthing. Herd somthing pop and looked and ill be chit if all six of my intake pushrods were bent and the first tappet had a chunk gone out of it. So I pulled everything back out. I told the guy that did my cam that I was running stock pistons, so im not sure what is going on?? Ill post some numbers that is on the cam here in a bit. Does anyone know what the ratio is on the rockers on a 12V? any other ideas as to what has happend? What is the maximum lift you can safely have on a stock tolerence and not require fly cuts?

Thanks
Lynn
 
Here are the numbers off the cam. Hopefully someone can translate them for me.

3160/3322
CC R102
Q 2481
-09

Lynn
 
It came from a shop down near Chattanooga, TN. It was sent out by a local guy here that I deal through. I have a stock cam here that I am probably going to throw back in for TS if I cant get this streightned out. If worse comes to worse Ill get a set of pistons Flycut and tear everything down and throw em in.
 
Well just got off the phone with the cam guy. He was really helpful. looks like I am going to tear her back down and fly cut the pistons. Hopefully ill have her together by the end of the week.

Ill be in the shop if yall need me.....
Lynn
 
dont know how big your cam is but there is other clearance that needs to be checked when you starting adding lift

keeper to guide etc

if the valves did contact the piston enough to bend your pushrods and break a lifter pretty good chance they are bent now

sorry
 
Yeah I am going to check the valves out really well wwhile I have it apart.
Somthing else that I didnt know that was a hidden factor in valve clearence is the varience in stock piston protrusion. The feller that ground my cam told me that there are about four diffrent variences that you could have depending on year.

Lynn
 
Did you back the rockers off from the origainal lash before you rolled the motor over?
 
Well Pulled the head off and nothing is hurt. It didnt even hit hard enough to knock the carbon off the pistons, so I got lucky. Now To get her tore the rest of the way down...

Lynn
 
well got her apart gonna get everything fly cut tomorrow... all my bearings look great so my luck is running with me so far.

Lynn
 
hope you gain A BUNCH from the cam cuz i have been where you are before and it is a lot of work

gl

don
 
Like I said before, as much work we have put in this thing, if it doesn't perform and get off the start line on the first pass, I'm drowning it in diesel fuel and lighting the match myself right on the track lol
 
oh it can get worse...been there.....took it apart, had pistons cut, mocked it up, checked everything that you can check, had sufficent clearance everywheres, took it back apart and put it together for reals and it blew up in the burnout box. learned the hard way that you cant just check number 1. if you do you are assuming that the machinist did all 4 or 6 or 8 pistons the same.

if you want to know for sure you have to check every hole
 
Man that sucks Lynn. Not trying to insult your mechanical skills, but are you 100% for sure that the cam was degreed correctly? I would be quite upset if I had to flycut the pistons just to make a "drop in" cam work.
 
teddybear said:
Man that sucks Lynn. Not trying to insult your mechanical skills, but are you 100% for sure that the cam was degreed correctly? I would be quite upset if I had to flycut the pistons just to make a "drop in" cam work.
Click to expand...

Well The guy that ground it didnt get all the info relayed exactally right. He did clarify that the variance in piston protrusion played a big role in how close you can safely get a drop in cam to work, but he has reasured me that I wont be disapointed in going this route. So well just have to wait til TS to find out.

Lynn
 
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