[jt2ma71]

Interference, should I be worried?

Title should say Interference, not non-interference
I just got done putting my long block together; Stock crankshaft, GReddy/Carrillo rods, Jun pistons, Ferrea valve train, HKS 272's. All new shims to set clearances within specs. The timing belt is not installed. With the no. 1 piston at TDC. I cannot fully turn the camshafts, valves hit the pistons. Both head and block were only machined once and not much was taken out. I am also using a stock toyota headgasket. Is there something wrong here? I know this happens with bigger cams and other brands but I didn't think the HKS 272's will cause it. Thanks for any input.
More info on my build up here

 

[gmacrae]

Im no expert here, but im sure when the engine runs there wont be any problems with interferrence. Unless you get some kinda big valve bounce (which you wont with those springs and a rev limiter), or if the belt snaps.

In your average "non-interferrence" twincam engine, when a cambelt breaks you often get valves bending anyway, not from hitting the pistons, but from intake valves hitting exhaust valves. So "non-interferrence" isnt always exactly what it says.

Thats probably shit you know already, but its my 2c

Awesome setup btw, shit thats a bulletproof motor.

Gene

edit: ok i read your other thread, there's definitely nothing i can say that you dont know, good luck anyway, let us know how this ends up

 

[jt2ma71]

Thanks. I didn't think it's a big deal anyway, especially with most of the parts not stock anymore. I just thought I'd ask. Thanks for your input, I appreciate it.

--Ron

 

[93civEJ1]

I ran into this same exact issue and thinking the same thing on my build.

 

[Jeff Lange]

Should have let the thread rest in peace, haha.

Jeff

 

[93civEJ1]

for what reason? You never know if someone else out there searching is wondering if more than just 1 person has ran into the same issue. Sometimes every little bit helps.

 

[Egoguy 96 6sp]

After you deck the block and head then 272's will become interference.

 

[jt2ma71]

So to close this thread:

Engine is running fine for over two years now. Revving up to 8.5K more than occasionally with no issues. I'm using a power enterprise timing belt for peace of mind and inspect it every time I change the oil.