Right now I am running a Comp cams 262XE, Weiand action plus intake, roller tip rockers, stock heads, edelbrock 600 cfm carb, flowmaster muffler, stock exhaust manifolds, jacob's prostreet ignition.......

Obviously a work in progress. Long story........



Anyhow, so far I am pretty satisfied with my results. I of course need an exhaust system, badly! Hopefully that'll happen very soon.

Well when I do my heads, I think I am just going to pull the engine. I am thinking that since I'll be that far into it, I may as well go ahead and upgrade my intake and maybe even my cam selection. The 262 is OK, but I am thinking of switching to the Comp XE 268....

I'll be switching to L98 aluminum heads.

What kind of numbers could I expect? How is the idle with this cam? Any experiences?

Anybody with Desk-Top Dyno that would want to run something up for me?

305 9.5:1 compression ratio
Speed Demon 650 carb
1 5/8" headers
Edelbrock Performer RPM intake
Jacob's Pro/Street Ignition
Aluminum heads 1.94 intake / 1.50 exhaust (I think)
Single 3 inch exhaust
Flowmaster Muffler
Cam specs:

Specifications:
* Advertised duration: 268 intake/280 exhaust
* Duration at .050 in. cam lift: 224 intake/230 exhaust
* Gross valve lift: .479 in. intake/.480 in. exhaust
* Lobe separation: 114 degrees
* RPM range: 1,800 to 5,800


What do you think?

 

sounds like a good cam to me. your idles prolly gonna be a little lumpy which is always good. let me run up the # on my desk top dyno and we will see what we get

 

v6camaroman,

Let me know.

Thank youi:hail:

 

i got the results this is no **** the engine made 341 hp @ 5500 and 342 ft tq @ 4500 this is on desk top dyno so in real life give or take a few hp

 

Those numbers don't sound too shabby do they? I think I can live with that....hmm...

 

Kinda reminds me of this, only better in your case: http://www.angelfire.com/nb/thirdgen/343hp305.html

I like your combination. You're gonna really want a higher stall torque converter if you have an automatic.

Good luck!

 

Gotta 5 speed!

 

Noooo! please for the sake of making power, go with the GMPP Vortec or if your stuck on aluminum, milled Fast Burns.

The L98 heads just dont flow that well

 

Hmm, is this car for the street or strictly for the strip?

If for the strip, then go crazy!

If for the street, then that XE262 is really pushing things with a 305. Comp Cams themselves recommend only the XE 256 for a street 305 due to the overlap you get into with the 262. Power brakes, etc. won't work quite right, etc.

Desktop Dyno only shows a gain of maybe 5 hp from the 256 to 262 anyway. I'd not trade driveability for a measly 5 hp at 5000 rpm.

 

I'm running the 262 right now, no problems. Great sound, good response...I'm very pleased.

The problem I have with the Vortecs is that I have to have them milled and I have to get a new intake. Then even with the 262 I'm really pushing what they can handle as far as lift goes.

The L98's being ported, polished and having a 3 angle valve job should do just fine. Keeping the price tag low is important for me...these are a good compromise. Besides, just about anything is a step up from what I've got right now.

 

You have to mill the L98's to keep up the static compression because of the heat loss.

P.S. If you have intake problems World S/R 305 Torquers outflow the L98's on exhaust and intake (both heads unported)

 

my cam is in my sig below, it's got a great idle and great power, brakes work great and I have a 5 speed so now auto worries. I say go for it.

 

Tom.

So you have pretty much the same cam.

I think that's what I'll go with. A lot of people said don't go with the cam I have now, "It'll be too big"....or "It's too much for a 305."

I often think that people feel that a 305 is a 3 liter engine not a 5 liter engine....

I have had no trouble with the cam I am currently running. Even if you do, you can get a vac canister for your power brakes....

But I can verify that the comp cams Xe-262 works perfectly for the street in a 305.

 

Displacement does make a difference on a cam size.

The engines ability to breath is huge and a larger size engine will breath more air/fuel.

Ever stuff a massive cam in a 283 then put it into a 400? It does act differently.

 

iroc22,
yes we know that, but in my 305 my cam works great and gruveb's hopeful cam would work well too. we're talking about a specific application, you're talking about general physics.

 

Hmm, one last question. Are you using a roller cam?

 

no, a regular hydraulic lifter setup. same as what came with my car. rollers would be better but weren't those only in tpi motors?

 

No offense to anybody here....but if you've never tried it, you should state,

"Well, I'm not sure but I think that the cam in question would be too big...."

or something long those lines.

But to say, it won't work, it's too big.....go smaller -- without having tried it or without stating that you believe it won't work, can be very misleading.

I know for a fact that I have a smooth idle with stock heads and stock exhaust manifolds on my Comp Cams XE262.

Of course the same cam will make different engines behave differently. That however does NOT mean that the cam we're talking about won't work well in a 305.

Too big of a cam is one of the most common mistakes made....no doubt about it. Cam too big for the engine combo---heads/intake/exhaust.

 

Actually 87-95 Caprice, Corvettes and F-Bodies all got the roller V8's

 

I agreee completely. We don't need people who are listening to overly cautious advice from Comp to help us make our recomendations when we're pushing the edge. We want experience. Plenty of folks running the XE262 in 305s, or similar grinds. More than a few folks running cams that are bigger, or even much bigger. Look at Tom84L69. I knew another guy that ran a 230/230 cam in a 305. Idled wicked as hell, and was certainly more cam than my buddy could use given his stock heads, BUT it did run pretty damn strong regardless, vacuum brakes worked fine, and the stock computer controlled carb never complained once.

Anyhow, i say go for it. The only thing i would change is i would mill the heads down some. You'll definitely want a lot more compression if you want to make full use of the cam. 9.5:1 isn't really enough for a mild cam with AL heads in a performance application, let alone w/ a huge no low end cylinder pressure cam.

Also, this going in a stick car or 5 speed, and what gears? You'll definitely want at least 24-2800 of stall to effectively use that much cam (if auto), and also 3.73-4.10 gears. You'd most likely be shifting that cam somwhere well past 6k

 

Ed,

It's a 5 speed. Right now has 3.73 gears behind it. I was thinking of moving up to 4.10 gears eventually.

In the mean time I've decided to switch to World Pro. Torquer 305 heads. They've not as cheap as the Vortecs, but will handle the larger cam more easily, do NOT require a new intake and already have the 58cc combustion chambers. Not to mention I can keep my current chrome high rise valve covers.

I've decided to go with a holley 650 instead of a Speed Demon b/c I can pick one up used for next to nothing.


I also figured that since I already have a Jacob's Pro-Street ignition system that when I add some nitrous I'll get a Jacob's Nitrous Box.....lots of neat safety features!

I figure worse case scenario I can run a vac. canister to help with the power brakes.

So what kind of numbers would the following bring according to Desktop Dyno:

305
10:1 compression
1.94 X 1.50 heads (iron)
Ported/polished/3 angle valve job
Long Tube Headers 1 5/8" primaries 3" collectors
2 1/2" dual exhaust/H pipe/turbo mufflers
Holley 650
Cam specs:

Specifications:
* Advertised duration: 268 intake/280 exhaust
* Duration at .050 in. cam lift: 224 intake/230 exhaust
* Gross valve lift: .479 in. intake/.480 in. exhaust
* Lobe separation: 114 degrees
* RPM range: 1,800 to 5,800

High Rise dual plane intake manifold
Jacob's Prostreet ignition system
Roller Tip 1.5 rocker arms

What do you think?

 

that's gonna be a sweet 305 let me tell you! The cam is a bit ilder than mine because of the 114 lobe seperation but I think it's a good choice. 10:1 compression works fine in my car with premium fuel and my factory milled and ported L69 heads. I'd go with a performer RPM for an intake. be sure to port match everything too.

Expect to be able to outrun most LS1s with average drivers because I can and you will have better heads, intake and carb with the same gear and trans.

ED,
you're right, the 230/230 cam makes for a wicked idle in a 305 . I love beating a mustang and then having them ask if I'm running a 350. their faces drop when I tell them it's a "lowly" 305 with just a cam and porting!

 

I'd hope that combo would run real low 13s once sorted out. And it'll definitely need some sorting / tuning, lol.

 

Would all of this stuff work with the EGR and CCCS still monitoring the car? It all sounds very interesting and I might like to try it out if I decide to rebuild my LG4.

Mark

 

gruveb that combo will probably come out working quite nicely.

What kind of hood are you running with the intake manifold?

 

Iroc22:

Right now I am running the stock hood and a 3" K&N filter.

It barely fits!

I'd like to slap on an ASCD big block hood and make it a functional cowl induction hood. I also may just go with a 3" cowl induction hood. I'm not sure yet.


I know tuning the set up I have now was a real bugger! Especially for a rookie like myself. I have worked on deisels before, but this is entirely different! OUCH!

But now that I've got that one under my belt, I'm ready for more punishment!

 

Yeah u might have a clearance issue after the swap!!

 

pretty sure these cams are too much for the computers to handle, though i never tried it with the computer. I removed my computer completely and I also have no emissions crap whatsoever. I have a stock ported intake with and a 3" tall k&n, there are marks on the underside of the hood from the filter! I'm sure an rpm intake would require either a short filter or a cowl hood.

Gruveb, for sure 13s if you set it all up right!

 

Don't let anyone talk you out of the L98 alum. heads they will flow vely well with a pocket port. I've got the same combo with a weiand 8004 int. and a crane hyd.cam 216@.050 .454 lift int/exh. The L98 alum. heads have a very good int . to exh. ratio [80%] and flow can be enhanced by porting. I haven't been able to fire my combo up yet because I'm studing for my electrical masters license. If cam is to big I'll switch it out.

 

http://users.erols.com/srweiss/tablehdc.htm

Check that site out and tell me what you think.

P.S. World Products 305 Torquers are 213int and 164exh @ .500lift. The Torquers on there arent the 305 version.

And you can port the Torquers like theres no tomorrow because World gives you so much more meat to port.

 

After reading this:

https://www.thirdgen.org/techbb2/sho...hreadid=101489

I think I'm just gonna have my stock heads worked.