stroking the 4.6l

[BLOWN00GT]

i posted a thread a few months ago about having a misfire in my #5 cylinder. there was no compression so i tore it down. i pulled the motor and ripped off the head. assuming there was a valve problem. i found that the #5 exhaust valve was bent. so it was not seating right, hence the lack of compression. what my problem is that i noticed all the valves have slightly touched the pistons. the reason for this is because i installed a stroker kit in the car. and now i have less clearance. i was under the impression that the stroker kit could be used with stock heads. if i were to put new valves back in i would be wasting my time. they would just bend. the worst piston was the #5 cylinder. which just looks like someone took there fingernail and just barely stuck it in a piece of clay. its so minor but still serious of course. i am not worried about putting the the car back together with the bottom end like it is. but i need to decide what can be done to eliminate this problem. whether its a different cam, head gasket or whatever. i have no idea and would like someone with some good ideas or maybe the correct solution. im actually kind of glad i finally figured it out. but now i need to fix it.... i am sure i am not the only one who had this happen.

thanks!

 

[Will Smith]

sounds like an interesting problem... what i would personally do is check the pistons for more damage than a light tap... the piston are coated with a special coating which can wear off and cause bad hot spots or even burn pistons.. besides that I would also think about considering buying aftermarket cams gears, new timing components, new lifters, and then taking ur car to a shop to check all the clearances with a cam that is properly dialed in. stock cam gears are ok but they can be off up to 6 degrees from one bank to another... in which case this may be why....

 

[BLOWN00GT]

all that stuff is pretty easy to do. i already have the heads stripped down. i was thinking that maybe it was just a timing problem. it would take much wear to get the valve to tap. there is really nothing wrong with the pistons. its so minor and a few of the pistons werent even damaged but have the signs of carbon from the valve. but it all wipes off. i would really love to get it solves as cheaply as possible. i know i would replace the timing components. i was unaware of the cam gears having problems like that. but could i use a stock cam. cause i know cams arent cheap. i would assume it would be easier for a garage to check clearances with the motor all tore down.

 

[Will Smith]

yes it would be alot easier for a garage to check the clearances... i personally go to a machine shop to have that checked since they are normally better for things like that...if you own a 00GT the only problem with using aftermarket cam gears is you will have to replace the cams as well...the 99 and 00 GT's use a pressed on cam gear while the 01-04 use a bolt on...