Well, I found out last night that my motor is jacked. So now it's time to do it again. I have basically an lq4 with a Comp 212/218 .558/.563 115 LSA, supposedly ported and polished 317's, and a Maggie MP112 pushing 8 lbs of boost. Because I need wheels I'm going to look for a used motor with decent miles to get my baby back on the road.

I went with an lq4 style build to keep the compression down because at the time I had a 8,000 lb camper I pulled to Bristol every fall across the Appalachians and I was worried about detonation on those steep hills. Now that the camper is gone, should I go with a lq9 for the bump in compression or would the power difference be worth it?

Other question is about the cam. I've seenseveral reports of failures with Comp cams failing in the LS motors and I'm thinking maybe i should go a size bigger but I love the low speed drive-ability that I have now. It's also sneaky because there is no lope at idle. Suggestions??

 

Stick with what you got if you like it as is, with as many people running comp cams as there are, hell even my btr came in a comp box, there are bound to be a few failures, but hell gm has cam failures on oe stuff

 

What is wrong with your motor? Is the block damaged? The crank? Might be able to just get stock replacement pistons and throw them back on the stock rods and pistons with fresh bearings.

 

Crank has a quarter inch of endplay. Engine is still in the truck so I'm not sure of other issues but I suspect they're there. Last month or so it was running the oil pressure dropped from 50-55 lbs to 25 lbs.

 

Grab an LQ4 stick your cam in and throw it back in. Then let it eat!!!

Check the oil pump on the used motor first though!!! I have seen a few them with the bypass stuck open. This will save some aggravation later...

 

Depending on the mileage I may plan on replacing pump anyway. Although I love it the way it is I'm sure there's plenty of room for improvement. Unfortunately I haven't ever reached the point of having too much power. But it's my daily so I can't go crazy with it......at least not yet.

 

An old adage comes to mind as it relates to your cam, if it aint broke, and youre happy with it, dont fix it...... If i could find a cam that would give me the power i want with a damn near stock smooth idle, id be all about it... If i was in your shoes, id iull the engine apart and see why the crank has so much end play, fix it and run with it.... Unless you find out its going to need a nee crank anyway at which point id find another engine and still end up putting fresh set of bearings, rings, gaskets, etc in it!!! Just my 2¢

 

what wolf said

 

Do you have that copied and ready to paste

 

lmao no