dounome Posted January 23, 2007 Report Share Posted January 23, 2007 I have heard that this thing would be loud but damn this is loud to me. A few people have said hey thats just life with a forged big cam stroker. I don't know about that.408 Idle Quote Link to comment Share on other sites More sharing options...
Chevcup47 Posted January 23, 2007 Report Share Posted January 23, 2007 Do you have a solid or hyd lift cam ? the pop in the exhaust dosent sound quite right may need some adjusting how long has it been ran? Quote Link to comment Share on other sites More sharing options...
dounome Posted January 23, 2007 Author Report Share Posted January 23, 2007 yeah the pops you here in the exhaust are from it being so lean at idle right now. She needs some tunning I know, more concerned with the valve train. Quote Link to comment Share on other sites More sharing options...
SuperSport Posted January 23, 2007 Report Share Posted January 23, 2007 what size is the cam, what springs are u using, what's the compression, and are you using aftermarket rockers ?? Quote Link to comment Share on other sites More sharing options...
dounome Posted January 23, 2007 Author Report Share Posted January 23, 2007 (edited) Mahle n2o coated pistons, callies rods, eagle crank. It has patriot stage 2 ls6 heads and 10.5 compression ratio. It has a comp cam 238/242 605/615 113 lsa stock rockers , LS7 lifters Edited January 23, 2007 by dounome (see edit history) Quote Link to comment Share on other sites More sharing options...
Black2003SS Posted January 23, 2007 Report Share Posted January 23, 2007 I so want a 408 now... Quote Link to comment Share on other sites More sharing options...
dounome Posted January 23, 2007 Author Report Share Posted January 23, 2007 Im close to sending you mine with the truck! Quote Link to comment Share on other sites More sharing options...
Chevcup47 Posted January 23, 2007 Report Share Posted January 23, 2007 if it has hyd lifters it shouldnt have that bad a valve train sound. But if your running solid lifters it will make alot more noise in the valve train. and sometimes the alum being less dense will make it sound even worse. but id still have it checked to make sure the lifters are adjusted right . sounds really loose to me even if its a solid lift cam Quote Link to comment Share on other sites More sharing options...
Bowtie70SS Posted January 23, 2007 Report Share Posted January 23, 2007 That sure dosen't sound good...the solid lift cams I have installed aren't that loud when cold. I guess the oil pump O-ring didn't help. It kind of sucks that you can't run it with one of the valve covers off to check things out. With as much as you have went through I would be tempted to put a smaller cam in. Another idea is to install a couple of those low tension valve clearence checking springs. Do that on a pair of valves to see what kind of clearence you have in the valvetrain. Did the guy you bought it from have any noise issues? I'm guessing it dosen't get any quieter as you rev it? Dave Quote Link to comment Share on other sites More sharing options...
rivierakid55 Posted January 23, 2007 Report Share Posted January 23, 2007 doesnt sound good to me at all. im running a solid cam in my 494 stroker in my buick and its nowhere near that noisy. Quote Link to comment Share on other sites More sharing options...
dounome Posted January 23, 2007 Author Report Share Posted January 23, 2007 Now I have heard from some folks on the PT site that it sounds like my pushrods are way too short. Quote Link to comment Share on other sites More sharing options...
rivierakid55 Posted January 23, 2007 Report Share Posted January 23, 2007 i was gonna ask about pushrod length but thought i remember you addressing that issue before. the lsx style rockers dont require different length pushrods? Quote Link to comment Share on other sites More sharing options...
misterp Posted January 23, 2007 Report Share Posted January 23, 2007 Yeah that valvetrain is noisy, more than it should be but it's not eating itself (that's the good news). More good news, it does not sound like any one valve (clattering), so I would agree with errant valvetrain geometry, also agree that pushrod length would be my first suspect. Remove the valvecover and verify that the roller tip of the rocker arm is actually wearing a pattern centered on the valve stem, not off to one side (the upper/inward side). If you need to clean & cover the valvestem with ink, reassemble, and turn over the engine with the starter and you should see the rocker-tip wear area revealed. I like your choice of cam though Get that valvetrain geometry squared away and then the tuned so it will idle at something less than 1000-rpm and you'll have a true head-turner Mr. P. Quote Link to comment Share on other sites More sharing options...
rivierakid55 Posted January 23, 2007 Report Share Posted January 23, 2007 that incab portion with that cam rumbling sounds awesome! what stall you running to keep up with that cam? Quote Link to comment Share on other sites More sharing options...
brobradh77 Posted January 23, 2007 Report Share Posted January 23, 2007 that incab portion with that cam rumbling sounds awesome! what stall you running to keep up with that cam? Quote Link to comment Share on other sites More sharing options...
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