Northwest Members - Future mods for the cam I'm going to use

Ok here's the deal.
PnP 317 heads ( for now )
PnP LS6 ( for now )
Forged .030 over -4 pistons ( don't know what brand )
Forged H-beam rods ( also don't know what brand )
And a 200 wet shot:D This is why I need the duration from what I've been reading. And maybe a 112 is too much lol.
Anyone can chime in if they want.
The more the better

Ok here's the deal.
PnP 317 heads ( for now )
PnP LS6 ( for now )
Forged .030 over -4 pistons ( don't know what brand )
Forged H-beam rods ( also don't know what brand )
And a 200 wet shot:D This is why I need the duration from what I've been reading. And maybe a 112 is too much lol.
Anyone can chime in if they want.
The more the better

I have a question. What is your question? :D

Mike

Lol. Well I'm going to use somewhere in the neighborhood of a 247/255 .625 lift with a LSA113?
What do you think?

Lol. Well I'm going to use somewhere in the neighborhood of a 247/255 .625 lift with a LSA113?
What do you think?

If this is for a 370, I think it's too big of a cam for street use unless you love to replace valve springs every 12-15k miles. You'll get very tired of the surging at low speeds, and no low end power. Trust me, I've been where you're at and I love big cams as much as the next guy, but you'll get tired of driving it very quickly after the "newness" wears off. Also, better plan on some different gears, something around 4.10 or better or you'll be going through clutches trying to get that pig to move from a stop without chattering the clutch. You'll probably make more power with a smaller cam anyway, especially with ported 317's.

For a nitrous cam I'd look at something with a 114 or 115lsa, and with about 8-12 degrees more on the exhaust side. Nitrous loves good exhaust flow and tight LSA's. For a dual purpose street/strip combo on nitrous, I'd look at something with these specs: 230/238 .600/.600 114 LSA. Keep the valve lift under .600 and try to choose some non-aggressive cam lobes for longer valve spring life.

If you're really looking to run a 200 shot, you might want to have some funds set aside to replace some pistons when necessary. The learning curve for high hp nitrous is not very kind and even an experienced nitrous user can burn up a forged piston/s very quickly.

My .02.... :D

Mike

:bang:.. I want that big cam sound really bad. Ok so that duration is a little high. What about something with less but higher then what you said?
And I do understand what you saying about the surging, but isn't that what a DD is for lol..

:bang:.. I want that big cam sound really bad. Ok so that duration is a little high. What about something with less but higher then what you said?
And I do understand what you saying about the surging, but isn't that what a DD is for lol..

i will rent you my truck so you can tow your car to the track :D

jk

i dont know much about running nitrous but i wanna a ride when your car is done lol

Oh I'll be driving this beast buddy:).. And when I'm done then who ever wants a ride will get one:thumb:

It's gonna be a beast!

Hey mike cam be my evil twin:devil:..lol

:bang:.. I want that big cam sound really bad. Ok so that duration is a little high. What about something with less but higher then what you said?
And I do understand what you saying about the surging, but isn't that what a DD is for lol..

You could go a bit higher like maybe 232/240. Again though, you're going to like it less and less as a daily driver the higher you go with duration. The cam I mentioned in my first post will still have a decent lope at idle, and it will wail on the bottle.

Another thing to keep in mind is compression. Those 317's aren't going to give you much compression ratio with those large combustions chambers. This will also limit how aggressive you should go with cam choice. You will quickly reach a point of diminishing returns when choosing a cam that's too large for the amount of compression it will support.

Mike

You can have the big cam sound with a much smaller cam. The LSA is more of what determines how rompy the car sounds anyway, like my cam 235/240 111LSA sounds pretty good.

Heres some more .02 i like my cam just fine for weekend street use, but now that ive been dding the car for a couple months i really am quite sick of it. I swear it used to run alot better lol. But u say you have or are getting a dd anyway.

Yeah I know about the CR... What if I milled the heads down? Would that bring it up.
Also what if I PNP my 853's? Or should i just sell both and get some 243's?

You can have the big cam sound with a much smaller cam. The LSA is more of what determines how rompy the car sounds anyway, like my cam 235/240 111LSA sounds pretty good.

A smaller numeric LSA will affect the way it sounds at idle yes, but that smaller LSA is the opposite direction a N2O/SC/Turbo car should go.

Mike

Yeah I know about the CR... What if I milled the heads down? Would that bring it up.
Also what if I PNP my 853's? Or should i just sell both and get some 243's?

You could mill the heads to a point, but then you're making a thin factory deck even thinner which is not what you want for a N2O car. I'd seriously look into a different set of heads if I were you.

Sell em' both and get some 243's.

Mike

A smaller numeric LSA will affect the way it sounds at idle yes, but that smaller LSA is the opposite direction a N2O/SC/Turbo car should go.

Mike
Really? Ive been reading and they say the lower the better due the extra exhaust gases. But I guess you cam compensate with the duration right?
I would love to look into different heads but for now im going to use these.

And my car will make me get another DD..lol

You might wana get the dd before u build this car just to be safe. Trust me u dont wana dd a big cam car its hella gay

Well I'm doing this out of car. So I'll get one ( hopfully ) before it goes in.. But I'm going to drive it tell I get sick of it or break it..lol

Get some newly revised Advanced Induction 243's. Some insane heads. They put out monster power. That's the route I'm gonna go at some point.

Holy shit Todd those are waaaaay to much from
Just machine work 1050 all the way up to 2000 complete. Well I guess that's better then AFR's.

Don't go off their internet pricing. If you supply the cores, they will work them over with new PSI valve springs for $800. I've already inquired with Phil and Ron over email and phone. You get what you pay for and these heads are top notch and best bang for the buck. There have been several threads about them with track times and dyno sheets to back up just how nice they are.

Oh ok that's better..lol. Thanks for all the info and help guys. Almost brought a tear to my eye..lol..
But keep it coming the more info I get the better off I'll be.

Have you already started tearing the lq4 apart?

Nope it's still all wrapped up and sitting on the pallet. I'm waiting to get a hoist so I can put it on the stand.

LT4 Hot Cam.

Lol good one.. I'll just sell the motor and get a lt4

Yeah deffinetly listen to mike on the cam choice. Boosted and nitrous cars do not like low LSA's. You may lose the sound you want but that may be a price you have to pay to go nitrous.

Yeah I'm slowwwwwwly letting it sink in:( but all in all this Thing is going to scream:D

Really? Ive been reading and they say the lower the better due the extra exhaust gases. But I guess you cam compensate with the duration right?
I would love to look into different heads but for now im going to use these.

And my car will make me get another DD..lol

I think you might be getting the terms confused?

A 110 is numerically lower than 114, but the 110 has more overlap. The 114 will have a smaller/tighter overlap which is what you want with nitrous/supercharger etc.. Overlap is the amount of time in which both the intake and exhaust valves are open at the same time during the valve event cycle. The tighter the overlap, the less nitrous/boost you will lose out the exhaust valve, therefore making more hp.

Now for a NA engine, the numerically lower number will benefit the power production because the more overlap you have, the better scavenging you'll get. You'll see some drag cars with 106 LSA's. Scavenging is where the exhaust gas pulses moving out the exhaust valve actually help pull IN the fresh air/fuel mixture through the intake valve.

But what do I know? I'm just some backyard shadetree mechanic talking bs on the internet...... lol. :)

Mike

Damn mike!!! I've been researching over and over and no one could of gave me a better explaination.. Thank you:thumb:

Glad I could help out man. :thumb:

Mike