I am looking for an answer that would prevent my pushrods from bending. I am rebuilding a 65 mustang. This is the first engine I rebuilt and have read every article and called every auto tech in my city for answers but really no one wants to help nor have the correct solution. Here is the run down of what my specs are:
66 ford block 289
351W CAM performer edelbrok
302 crank, connecting rods/ pistons, and 1972 302 heads (valves 1.94 and 1.6)
66 hydrulic rockers
screw in rocker arm studs
When I first assembled this engine and turned the key I got several popping noises through my carb. I was told it was a timing issue. After further investigation, I found out that your firing order is determined by the type of CAM. I changed my firing order and it still ran rough. I then noticed that my rocker arms and pushrods where not tight. So I tighten to zero lash on the firing order and it still ran rough. Then my neighbor stopped by and said your pushrods (6.905) are too small since the rocker arms were almost sitting on the screw in stud bolt and I couldnt tighten them any further. So I purchased some 7.3 pushrods and started my engine up. It started great until I hear something rattling in my heads. I removed the valve covers and one of my pushrods snapped one of my studs and ALL MY PUSHRODS were bent. I set all my pushrods prior to starting the engine to zero lash without even giving the nuts an additional 1/4 turn. Whats going on????
I am at a lose and really can not afford to keep buying new rods. I would appreciate any help or some sort of answer.
Thank you!!!!!!!!!!
66 ford block 289
351W CAM performer edelbrok
302 crank, connecting rods/ pistons, and 1972 302 heads (valves 1.94 and 1.6)
66 hydrulic rockers
screw in rocker arm studs
When I first assembled this engine and turned the key I got several popping noises through my carb. I was told it was a timing issue. After further investigation, I found out that your firing order is determined by the type of CAM. I changed my firing order and it still ran rough. I then noticed that my rocker arms and pushrods where not tight. So I tighten to zero lash on the firing order and it still ran rough. Then my neighbor stopped by and said your pushrods (6.905) are too small since the rocker arms were almost sitting on the screw in stud bolt and I couldnt tighten them any further. So I purchased some 7.3 pushrods and started my engine up. It started great until I hear something rattling in my heads. I removed the valve covers and one of my pushrods snapped one of my studs and ALL MY PUSHRODS were bent. I set all my pushrods prior to starting the engine to zero lash without even giving the nuts an additional 1/4 turn. Whats going on????
I am at a lose and really can not afford to keep buying new rods. I would appreciate any help or some sort of answer.
Thank you!!!!!!!!!!