Here I am with another 350 question
I have the lo5, and I was wondering what kind of cam can I have in it. Here is the pic of the lifter valley and you can tell me what would work.
Thank you sooo much. Never built a motor before so I am sutmped. I am gettin a video soon of how to build a small block chevy. I am a visual learner.
Thanks again and here is the pic.

That is a roller motor but you can't tell what cam it has in it by looking at that pic. You will have to try to decifer any stampings on the cam or get out your caliper and do some basic measuring. You can use any hydraulic roller cam provided its lift figures don't exceed the lift limits of the heads you use. You also want to choose one that is a good match for TBI and tuning in general.

Right on shifty. Dude if it is the stock cam trash it and go for a larger cam since you are building from bottom up.

Bill

Non-roller engine block. The factory roller blocks have 3 bosses sticking out of the ridge in the center of the valley. They are tapped for a 5/16-20 IIRC, to hold down the lifter spyder. Your block is missing those.

Fast 355 is correct! I saw the two threaded holes on that ridge which I prematurely deemed it a roller. As fast355 said roller blocks have those holes tapped into a boss. I had my mental visualization mixed up. Refer to the pics of the lifter valley on a rolelr motor in the LT1 cam digest.

I didn't think Shifty had it right because I didn't see enough material for the factory roller-lifter spider plate attaching points... but Fast gave a more precise answer first.

IF the engine is an LO5, then it's a TRUCK version of the LO5; the passenger car LO5 got roller lifters, trucks got flat tappet. So if you have an LO5 truck engine, then it has a flat tappet cam --- I used to know the specs for it but I believe they are around 195/202 deg i/e. I don't recall the lift but it's probably under 0.40" intake and slightly over 0.40" exhaust -- both as measured at the valve.

If you opt for a non-stock cam, then make sure you do as Shifty suggested --- use one that won't be too tough to re-tune the ECM.

Who sells flat tappet cams?? anyone have any they wanna get rid of?? I am used to dealing with rollers and flat tappet is something new to me.
Thanks soo much for the help

Here are a few pics to help clear up my initial mistake. As noted there are three spider hold down bolts and not two as I previously thought.



Spider hold down bolts



The three bosses are clear here in this pic of my LO3.

I found a cam but it says it for an 305 HO. I called crane cams and they told me that this is their performance one for the LO5 motor out of a truck, 1988 year.
What do you think.
They said that this one would work with my computer.
http://www.cranecams.com/?show=brows...22&lvl=2&prt=5

They all say that . No cam will work the way it should with these cars. Chip work will be the only way to tie your combo together.