Lifter/cam interference?

What cam sprocket did you use?
Got pictures of how you aligned crank/cam sprockets?

 

I am having problems with lifter/cam interference.

can you explain this more?

 

Unfortunately I do not have pictures, we will be working on the engines again this Saturday and i will get some then. We used the stock cam sprocket with a 4` limiter as supplied by the BTR kit. The kit came with new lifters and push rods, the stock rockers were used. We aligned the marks on the crank with the marks on the cam which should have set the cam at 0` (not counting anything that is built into the cam). After checking tdc against valve movement it looks like aligning the marks actually set the cam timing around 30` advanced. We are trying to verify what marks are to be used if any. We can set the crank to TDC on the no 1 cylinder, but we need to know how to set the cam so there is no interference between the valves and the lifters, in other words at 0` in relation to tdc.

 

Are you sure it’s not a Gen V kit trying to go into a Vortec or vice versa? Both TSP and BTR have quality stuff. The only other thing, are you sure you cam/crank timing marks are correct? Valve to piston interference sounds like your timing gear/chain is way off

 

There is a dot on the crank gear, and an arrow on the cam gear. These need to be facing each other (dot at 12 o'clock position, arrow at 6 o'clock position) when you install the gears and timing chain.

If you did this, and had the cam gear apart, are you sure the spring didnt unload tension?

I am in the middle of a DOD delete as well but I only got the L86 modified cam since I want to retain the VVT feature.

 

Followed the directis for installing the timing limiter, so the spring didn't unwind, no problem there. I was afraid the whole time due to the "it'll explode on you if you aren't careful" warnings.

 

I think we got it figured out. The cam rotated during installation, the pin on the cam snagged on one of the oil holes on the cam sprocket. There's quite the gouge on the back face of the cam sprocket where the pin marked it up. We polished it out as best we could and reassembled it making sure the cam pin located in the correct location. We tightened the lifters, rotated the crank 2 full turns with no interference and the marks lined back up correctly. Next weekend we will reassemble the engine and hopefully get it fired up.

 

Thanks for following up, hopefully that does the job. And that you've been doing this testing by manually turning the engine over, not using the starter, when the rest of the valvetrain was/is in place.

 

The kit is from Texas Speed. Both they and BTR confirm the kit is correct for the engine.

@RDF1