1990 gsx, 0 mile only idle time 6 bolt block I bought from a reputable seller in the community. 6 bolt cylinder head, new topline lifters (bled before installed), kelford 272s, oem valves that were lapped in by myself and my friend. Brand new gsc beehive valve springs and retainers. Brand new 9627pt felpro head gasket with L19 studs torqued to 115ft/lbs, brand new timing belt pulleys tensioner etc.

We fully assemble the entire build and drop it into the car. We gap brand new plugs and toss them in and hit the key. It cranks but doesn't fire up so we wait a little then it finally fires up for 5 seconds then dies out and won't even try to fire again. So we pull the head thinking bent valves but all the valves are 100% good, then we think maybe timing belt slipped but everything lines up and belt is 100% good. We run a compression test and get 40-75-40-100 (1-2-3-4). It's a fresh block so rings aren't seated yet but we have zero idea what is wrong that the car won't even attempt to fire. My friend and I have spent 2 straight weeks mulling and replacing parts that we would even suspect to be the issue yet absolutely nothing has changed anything.

We did a poor man's leak down test and it is coming from the oil galleries in the head to indicate rings but they're not seated so I'd assume that they should leak right now. The pistons are wossner with eagle rods. Unknown on specs from the rings as it was built prior to me owing it. Cylinder walls look excellent.

I asked the seller of the block his opinion on this and he says that it sounds like valvetrain. So before we swap all the goodies to a different head, Any input would be great to solve this huge PITA