Does anyone know adv. duration for a 97 factory lt1 cam? I am having my heads ported and I am going to use an sbc .015 head gaskets that are modified a little to get quench down to ~.035

Seems like the factory cam would have an ivc of 6X on a 117 lsa

Stroke 3.48
bore 3.90
head cc 54
deck .025


Doing a cam at latter period but need the car to be operational.

 

stock aluminum heads are most often quoted as having 58cc chambers.

And what stock bore are you talking about? LS1? An LT1 has a 4.000" bore.

 

Not trying to sharp shoot but I though the LT1 heads usually cc'ed at 54.4.

 

maybe the LT4s...

 

stock LT1 bore and yeah some heads cc @ 54 and some @58 and in between. it is a known fact. but please don't turn this into a mine cc'd this and mine that .

 

no definately not trying to do that,

I can't find the 97 specs but for 96 they are:

205/207 .447/.459(with 1.5) .477/.490(with 1.6) 117

Who knows where it is installed ICL wise stock , and the duration is at .050, you would need the advertised numbers to get a real answer.

If you have a degree wheel for degreeing your cam you could always mock it up and see when it really is closing and then do your math. You would have a exact answer then.

Hope I was some help.

 

Yep thanks! Duh I should have thought about the degree wheel myself so thanks again.

 

just out of curiousity before I start taking things apart does anyone know the ivc of any of the stock lt1 camshafts? I think I have a lot of wiggle room because it seems that the ivc of the 117 cam would be around 7x degrees.

Also anyone know advertised #'s advanced or retarded? Seems like this should be easy to find online.


Also, what the heck is the relief of a stock LT1 piston? It seems no one knows this one?

 

Stock piston should be around 5-6cc relief.

 

do you know if that is blueprinted or actual?

 

That's what I found with all the other stock numbers and knowing the stock SCR. That's just what I calculated it should be.

 

What .015 gaskets are you talking about and has anyone had issues using them??

 

http://store.summitracing.com/partde...4&autoview=sku

I think he means these^. I know several people run them on the board but they require cutting a few more water jacket holes. no big deal for the extra quench. I was actually thinking about running these if/when I get some new heads

Also here are the specs of an LT4 Factory Camshaft advertised to give you an idea of how lazy the factory lobes are (NOT saying these are accurate numbers not even sure where I got this from ) just for the hell of it/discussion - maybe someone can validate? (hard to believe the exhaust lobe would be that aggressive for factory probably 287?)

Duration @ .006 - 282/277
Duration @ .050 - 203/210
Lift w/1.5 rocker -.446/.449
LSA 115*

 

In four years of looking I've never seen an adv dur for a stock Lt1/4 cam, so unless you have a source, those numbers are bogus. The rest of your numbers agree with what's found elsewhere.

 

[QUOTE=RRR;4442734]http://store.summitracing.com/partde...4&autoview=sku

I think he means these^. I know several people run them on the board but they require cutting a few more water jacket holes. no big deal for the extra quench. I was actually thinking about running these if/when I get some new heads

QUOTE]

thank you very much.