View Full Version : Cam questions
05-08-2012, 11:34 AM
I bought my truck a few months ago and it came with an L98 roller with tbi intake on it but it wouldnt run. I dicked around and dicked around with it. Found all kinds of problems. couple bent push rods. crank gear on wrong, oil pump rod was layin in the pan, 2 long shank spark plugs that i barley got pulled outta heads cause the ends had got into valves and smashed to hell, but just yesterday i finally got around to pullin cam out. What i see is a flat tappet hydrollic cam. Non roller. but, i have roller lifters and stamped roller rockers. Would this cam keep it from starting or running? shouldnt it of had a roller cam with fat round lobes instead of the stock flat tappet type that u find in any 70s to 80s blocks?
05-08-2012, 11:43 AM
Sounds like you got a frankenstein that needs a total teardown. It may run but not for long... too much cam could also cause the computer to freak out.. Flat tappet cams are ground with a slight angle to make the lifters rotate, it keeps the surface of the liffer uniform. This also keeps pressure on the cam toward the rear of the block. A roller cam requires a retainer plate or cam button for just this reason, the lobes are ground evenly so the rollers have a flat surface to ride on. The cam and lifters are probably toast, not to mention there are probably shavings elsewhere in the block from the mismatched cam/lifters
05-08-2012, 11:53 AM
thats what i thought. boy that kid shur talked that truck up thought. oh it ran damn good. burn em through 2nd. YA right. I think the lifters are fine just dirty prolly need rebuilt but the rollers roll smoothly and dont look like anything is tore up. even the cam looks fine but it dont match everything else. The motor is gettin rebuilt with an Eagle 383 kit, Track tested 195cc Aluminum heads with 64cc combustion chambers and prolly a 230 lunati roller cam. Im still learnin how to burn chips so ill prolly go carbed for a while. Might go a 290 dur cam at 555 lift. but thanks for the help greatly appriciated
05-08-2012, 12:07 PM
If you haven't looked into the EBL and would rather flash the computer than burn chips, it may be worth checking out... you'll be up around $540-620 for the EBL plus the TT-1 wideband (a must for any type of tuning, other wideband setups can be used though), but all you'd have to do then is connect to a laptop and do everything from a windows desktop. The EBL board replaces the daughterboard in the stock ECM, mine was 100% plug & play, no extra wires to run (outside the serial/USB cable and wiring for the wideband).
Hopefully the lifters are ok... is it an OE setup? That's what I'm running in my 383 with an XR264HR cam (212/218º, 110LSA, .487/.495), kinda wishing I would've gone just a little more aggressive... probably will when I reuild the trans.
06-20-2012, 01:15 PM
I hv a question I hv a 2000 5.3 sierra I'm looking to put a stock LS1 cam and thinking bout 6.0 heads would that hurt more than hurt?
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