ok guys need your screw up pics

[Vampcrist]

Installing now

So I'm in the same boat somewhat. I just got my motor back from the guys that did my bore out and assembly. Problem is he didnt have the gasket so my pushrods are out still. Now I know there are shorter and longer and I want to make sure I don't make this same mistake. I got the GEN1 2.8L as lovely as they are. I notice the rod guides are listed as O and B and I'm sure thats telling me what one is intake and exast but i dont know what one is what and my Chiltons of course doesn't happen to mention any of this. If anyone happens to know what one is intake out of the B and O on the guides I would be much appreated.

Thanks

[abycat]

another non interference motor the 2.0 ohc four from the 90 sunbird and a 3.0 v6 from a mazda mpv.

[1meanz]

ok just to keep you guys updated, i got "layed off" (guy said if he gets more work he will call me in a month or 2) blah, so i went to nc to help my father in law work on his 69 superbee so i havnt even looked at this car. my uncle has fucked around with it and found that it has 3 bent valves. and a bent pushrod. so idk what he is going to do, but ill tell ya, its crazy as shit that this "non interference" motor has all this bent shit from the pushrods backwards dont ya think? lol

[3400-95-Modified]

SuzukiGhostRider beleives that the 3x00 and 3.1 2.8 motors are non interference too... LOL

Proof.. A 3400 I bought had 2 or 3 bent valves from a snapped camshaft. Here's some of the pistons.

[Driver_10]

Almost all pushrod v8's are interference too. Actually there are far less NON interference motors than there are interference motors. Can anyone name a modern day non interference motor?

Ford 2.0 "split-ports" are free wheeling.

[pocket-rocket]

The 2.3 in my truck, but seeing how it was originally designed in the 70's that probably rules it out as being "modern". But now you've got me thinking, lol.

[geoffinbc]

Almost all pushrod v8's are interference too. Actually there are far less NON interference motors than there are interference motors. Can anyone name a modern day non interference motor?

[pocket-rocket]

He live under something that resembles a rock, or does he just live in a cave where there are nothing but pushrod v8s? The ricers in your area must go with just visual mods and no real engine work if he hasn't seen an interference engine besides Subis.

[1meanz]

as soon as the rain/snow goes away, and it warms up, AND i get some time off work ill get along to fixing it. i have a good set of 3100 heads, so im just going to switch valves with his(mine are ball and pivot) and see what else we find.

p.s. dumbass owner of a speed shop called me a liar and said you can take the timing chain off of these motors and crank on them all you want and they wont hit. and said that subaru is the only interference motor around lol.

[geoffinbc]

Normally, these engines are NOT interferance engines, but that is under NORMAL circumstances, and not due to error or stupidity.

Under normal circumstances no engine is an interference engine. If it were custom valve reliefs would be the least of our problems. But all of the 660 engines are interference engines. If for some reason the cam timing is out of sync with the crank rotation you will smack the valves like you have discovered. In the case of swapping pushrods well the problem lies in the valve being open to begin with (because the long pushrod is in the wrong position) and then being open even further when the lifter rises.

[pocket-rocket]

DOH! I was hoping for the best. Fixing someone elses mistake is always worse then fixing your own.

[1meanz]

well evidently he has some bent valves or something, because with with the rocker arms backed all the way off it still has no compression, and thats with the pushrods right. so we will see.

[pocket-rocket]

well heres what i figured out. the rockers are on wrong. as in the grove arnt in right and there sitting to the sides of the springs. he had some pushrods backwards, and a few other stupid things backwards. so im going to tear into it and see whats up when i get time off work. so far i see that i can get compression with all the rocker arms backed off. so that says no broken valves. but i guess possible bent ones. we will see

Maybe he got lucky and since the slot was turned the wrong way and the rocker wasn't down where it was supposed to be, maybe it will come out without any bent valves.

[3100 MPFI]

I bent all of my valves from having the timing off before.

The shop I used to work in, one of the mechanics swapped 2 pushrods on accident (intake and exhaust), and it bent the valves, and broke the pushrod. We had to send the head off of to have them checked, and the valve replaced.

Normally, these engines are NOT interferance engines, but that is under NORMAL circumstances, and not due to error or stupidity.

As for my own bout of stupidity, I now have custom valve reliefs on my pistons from my timing accident (I have indents on my pistons where the valves hit the pistons and bent).

If you look closely at the pic of my piston, you can see the marks on each side. All six pistons are that way.

[1meanz]

well heres what i figured out. the rockers are on wrong. as in the grove arnt in right and there sitting to the sides of the springs. he had some pushrods backwards, and a few other stupid things backwards. so im going to tear into it and see whats up when i get time off work. so far i see that i can get compression with all the rocker arms backed off. so that says no broken valves. but i guess possible bent ones. we will see