how would you know if your timing chain slipped and needs replaced

Sounds more like a head gasket. If it jumped timing then both sides would be off.

we check plugs and they were fine except 2 & 8 were wet from excess fuel this were corected by replacing the spider injectors with a update MPFI , HE the mech thinks the cam timming is off due to excessive slack in the timming chain which caused the chain to jump a tooth or more on the gear what do you think ??

If the compression is low on one side but fine on the other I don't see how they can equate it the timing chain. Think about it. If half of the engine is showing low compression and the other half is showing good comparison that tells me that there is a leak on that bank.

well i'm going to check with mech and bring that to his attention , you make sense but he says that it's because the weak side is not closing properly allowing the compression to escape from the cylinders. due to the timming being off and slipping , i'm not mech inclined so i know up to this point i 've been taken for a ride but when you're broken down along the hwy in a rural area you don't have much of a choice but to trust one who is running a so call mech shop, afterward you find out he's a scam and know's little or nothing about repairing my trk or any vehicle he had to bring in someone else to take over the job . i'm hoping the new guy knows what he's doing , we will see ! in a couple days

If I was a gambling man, I'd put money on the head gasket. Let me know and good luck.

found out my engine is shot need a replacement , im looking @ a 94 5.7 it's not a vortec will it fit ? and what will i have to do to make it hook up it's a new rebuilt motor never been installed good price and within 25 - 30 miles from my home or should i go for a vortec thats over a 150 mile away and require a deposit or a core .

If you can just find you a good honest mechanic it will be good for you also you will be able to keep your eng. although if you decide to go for a 5.7 it will be a matter of preference. Right not you either have a 4.8 or a 5.3 L which is ok but ask yourself that question, what will be better for you. What are you looking for 5.7L means more HP. My preference of buying someone else eng is zero, unless they offer a 36,000 miles or 3Yrs warranty other than that the decision is entirely yours, happy hunting

I have almost the same exact problem with my 99 5.7 . Have changed fuel pump , distributor, cap an button , injector , plugs an wires , an the same symptoms , 2 and 8 don't immediately get hot but do withing a minute or so , now Mech is saying timing chain , after all the invested money and still no ride I'm wondering if this I the prob . Good compression, fuel pressure , no water leaks , no water in the oil nothing... Just a semi major skip.. also cats have been changed. .. #Searching

no compression timing mark are on with number one on dist. what is may next step

Check your distributor for a crack in the bottom plate or change distributor out for a new one there only about a hundered bucks or a little more. Chevyjoe

my truck turns on and when it's like a cold start the truck sounds like if it had a cam but then it stops and then does it again I all ready bought the distributor new. it all started ever since I put some headers on it

I have a 4.3l silverado who is smoking black and missing alot any idea what it could be ? I changed the distributor and changed the front bank oxygen sensors. If plug in both oxygen sensors it misses alot and if I unplug one it runs good

unplug one oxygen sensor because it just makes sense man my daddy taught me all about trucks he paid for mine