ss2000

iTrader: (45)

I'm at a loss on what's going with my build. I swapped all my parts from my
ls1 to my lq9. Same 59cc TFS heads, timing set, YT rockers and cam. I flycut .085 on intake and .100 on exhaust using Lindy cutters in same head. Cam is degreed same as old motor. Cam specs are a custom grind:
.243/.246 .624/.615 110lsa +2 advance. I'm checking it with checker springs and .040 head gaskets. When piston is top dead center, The intake valve can't move any more. I can't rotate the engine without it stopping. I just don't get it. I had slightly less flycuts in my ls1 than these.

badazz81z28

iTrader: (6)

Are you saying the engine stops and you can't rotate it by hand? Are you using the correct length pushrods?

ss2000

iTrader: (45)

Yes, I cant rotate it 360 degrees without it stopping at tdc, I'm using the same 7.500 pushrods.

bww3588

iTrader: (49)

I'd double check cam timing one more time.

Also keep in mind, the iron blocks have .010 shorter deck than aluminum blocks. But if you cut deeper than the ls1, I don't that causing a problem.

Are you for sure you didn't have the cam retarded any in the ls1?

bww3588

iTrader: (49)

And are you sure the valves are hitting and not something else?

hotrodth

Shouldn't you have shorter pushrods because of the milled heads and shorter deck height?

masterz28

iTrader: (8)

i was thinking the same

97badass

iTrader: (8)

Sounds like its binding, on mine it required stock length pushrods, .30 milled heads and smaller circle cam.

hotrodth

I'm thinking more like a 7.350 sounds more like what you need...always best to check geometry of valve train and pushrod length

wytry

iTrader: (6)

The TFS heads require the longer pushrods. I would say it has got to be the way the cam/timing gear is installed.