NF Cam

[trw427ss]

Did they Dyno your car? If so do you have a Dyno graph? Everything looks right in your kit pushrod length would not bend exhaust valves. Normally the only way you would bend exhaust valves is if the cam was installed a tooth retarded.

[Rabamaro]

Originally Posted by MightymouseSS

I've been told for the NF cam you should use 7.40 push rods. But every cars different and should be measured.

7.425 is the correct pushrod I believe.

[Rabamaro]

Originally Posted by trw427ss @ Futral

Did they Dyno your car? If so do you have a Dyno graph? Everything looks right in your kit pushrod length would not bend exhaust valves. Normally the only way you would bend exhaust valves is if the cam was installed a tooth retarded.

Hey now, no need for name calling!

[JT20]

Originally Posted by trw427ss @ Futral

Did they Dyno your car? If so do you have a Dyno graph? Everything looks right in your kit pushrod length would not bend exhaust valves. Normally the only way you would bend exhaust valves is if the cam was installed a tooth retarded.

yes they did but i do not have the graph

[christianchevell]

I agree it would have been a timing issue as some cams have a limited amount you can change the LSA let alone mess with the timing to advance or retard the cam with the amount of lift the LS engines have with our cams its not like anybodys good old chevy 350........ and it is the builders fault 900% unless you told them to do something with the timing they should know where to set it from the specs of your cam card in relation to its total amount of timing it can go and so your exhaust valves were sticking out too late in the combustion cycle and took a smack from your pistons and I would be pissed......... And want to be there for tear down if I let the clowns back at it to see if the friggin timing marks on the cams gears are opposite each other at exactly TDC no#1 piston.... and if they are its got to be whatever tune they adjusted the timing with........ Remember this is not the first engine ever built with that cam....and if they do not know what they are doing they should have asked ....and its obvious they did not know...... Its not like you jumped timing on the chain........ And the only whistling I heard of on hear was from people supposedly having bad cams..(some repeatedly) .and eating their cams..... and 7.425 is the right length for the pushrods as they are just 25/1000ths longer and are what the ls3 need compared to l99s 7.40 that have the vvt,(half the valves are different set up to turn off and the valves are solid not hollow). I would wonder if the cam is trash now, and wonder also If you insisted on a cam break in with a good break in oil like br30 from driven racing, as many people wrongly assume that its a roller cam and does not need break in....as so do the springs need break in.... http://www.drivenracingoil.com/news/...-break-in-too/

I am glad I researched well and picked the best guy I could find who specializes in LS engines and corvettes a lot to do my engine and tuning, some other smuck or my not using the right oil like ls30 I use now and I might be making a post saying ....Cam had a whistle... lobes are eaten after short time....lifters eaten.... The only whistle I get with my cars cam is the sound of the dual flow exhaust at very low speed and its sort of a old school blower whine out the exhaust if I am driving real slow from the rush of exhaust whistle out the dual tips set up. I wish you luck, and I have never had a bad cam and installed many since like the early 80's after I got out of the infantry and became a old chevy motorhead.

[ChevyCowboy]

A week and a half to do that work in a shop? Took me 2 days in my driveway with hand tools, suspension stuff goes much quicker. Something is indeed fishy

[WiredAVS]

What kind of power did it make?


ePhone

[JT20]

Originally Posted by WiredAVS

What kind of power did it make?


ePhone

501rwhp/487tq

[Lethal Racing]

We're the heads milled?

[Lethal Racing]

That cam doesn't have any issues with PTV clearance on stock heads.

[Joe@CPR.com]

Something sounds wrong here, it went through the dyno portion just fine and made extremely high numbers. Did you mill the hell out of those heads? I know that cam and there is zero ptv issues, line it up dot to dot and your good to go. If you had PTV issues you would know especially when spinning it to redline when everything stretch's a little. I feel there is more to this than you are either saying or are being told.

[376LS3]

Originally Posted by JT20

501rwhp/487tq

That right there sounds fishy. Those are numbers usually accompanied with a bad ass head porting job, ported intake and such. You're torque is the highest cam only I've ever seen. You have 87ft/lb of torque more than I do with the the same cam. If they didn't give you the graph, they just told you what you wanted to hear IMO.

[humblebeast07]

they said all exhaust valves were bent......timing????pistons even have exhaust reliefs right????

[humblebeast07]

Originally Posted by christianchevell

I agree it would have been a timing issue as some cams have a limited amount you can change the LSA let alone mess with the timing to advance or retard the cam with the amount of lift the LS engines have with our cams its not like anybodys good old chevy 350........ and it is the builders fault 900% unless you told them to do something with the timing they should know where to set it from the specs of your cam card in relation to its total amount of timing it can go and so your exhaust valves were sticking out too late in the combustion cycle and took a smack from your pistons and I would be pissed......... And want to be there for tear down if I let the clowns back at it to see if the friggin timing marks on the cams gears are opposite each other at exactly TDC no#1 piston.... and if they are its got to be whatever tune they adjusted the timing with........ Remember this is not the first engine ever built with that cam....and if they do not know what they are doing they should have asked ....and its obvious they did not know...... Its not like you jumped timing on the chain........ And the only whistling I heard of on hear was from people supposedly having bad cams..(some repeatedly) .and eating their cams..... and 7.425 is the right length for the pushrods as they are just 25/1000ths longer and are what the ls3 need compared to l99s 7.40 that have the vvt,(half the valves are different set up to turn off and the valves are solid not hollow). I would wonder if the cam is trash now, and wonder also If you insisted on a cam break in with a good break in oil like br30 from driven racing, as many people wrongly assume that its a roller cam and does not need break in....as so do the springs need break in.... http://www.drivenracingoil.com/news/...-break-in-too/

I am glad I researched well and picked the best guy I could find who specializes in LS engines and corvettes a lot to do my engine and tuning, some other smuck or my not using the right oil like ls30 I use now and I might be making a post saying ....Cam had a whistle... lobes are eaten after short time....lifters eaten.... The only whistle I get with my cars cam is the sound of the dual flow exhaust at very low speed and its sort of a old school blower whine out the exhaust if I am driving real slow from the rush of exhaust whistle out the dual tips set up. I wish you luck, and I have never had a bad cam and installed many since like the early 80's after I got out of the infantry and became a old chevy motorhead.

No if ands or buts about that