I've been half-assedly replacing my old shortblock with a TMS 370 over the last couple of months (having a 133whp Harley makes it easier to not miss the Camaro lol)

Well, I finally pulled my old 346 apart and my MS3 is SCREWED... Got gouged by a piece of the rod that broke, so time for a new cam. I figured I should go ahead and get somethng a little "better" to take advantage of the few extra cubes, as well as a few intake goodies. I don't have AC, so I think I'm going to go with the Chris1313 ram air and ditch the SLP flopac cai, and swap my 85mm SLP maf for a TSP 100mm unit. Think either/both of those will net me anything? Also going with an ATI 25% underdrive pulley without the AC pulley on it, figure that's good for a few ponies.

For cams, I'm looking at the polluter v1 (242/244 | .61x”/.61x” | LSA112) and the Texas Giant (248/254, .615"/.622", not sure which LSA to go with)
I don't really know what lobes either of those cams use.

Which do y'all think would show me more power/be faster in a 370 w/ -2cc Diamond flat tops, afr 205's (already have YT ultralights, will be reshimming) and FAST 92/PTM92? I have a Yank 4000ss and 4.10 gears.

I'm not very knowledgeable on cam selection. I don't want it to be a complete dog, but my understanding is that the converter will keep me out of the low-range for the most part. I like to run on the street and will be driving it fairly regularly, but manners aren't all THAT important. I DD'd my MS3 for two years, loved it. I just want to put a hurtin' on some people, on the street as well as the track. when I go.

What do you think? Would the texas giant be too big, or would it make for a nasty combo?

 

I'm running a TMS 370 with a cam almost identical to the MS3, and to be honest I wouldn't want a cam much bigger. Rest of my mods are listed below

 

I go with the slightly smaller, POLLUTER V2 .

http://www.tickperformance.com/tick-...1-ls6-engines/

 

Get one spec for you app it would be worth it.tick performance,pat g,eps,Ed Curtis.thats your best option in my opinion

 

I'm not so sure those other cams will be better performers with your setup to be honest.

 

Solid Roller....

 

my old lady would KILL ME.

 

Absolute no on the Texas Giant cam.

I'd ditch the MAF altogether.

If you want something that would be killer in a 370... EPS 243/251 .628"/.628" 111+2.

 

Between the two, I'd err on the smaller side and use the Polluter. The bigger cam could make more power, but it may be too much if you want to drive it on the street every now and then.

 

Thanks for the inputs, y'all... JakeFusion, do you have anymore details on the EPS cam? I couldn't find it listed on their site

 

Talked to Geoff, he recommended his 236/248 cam, I'm under the understanding that this is the mythical "t-rex killer"... Any thoughts?

This is what I found:

http://www.engpwrsys.com/index.php?a...d&productId=11

 

I like the tighter LSA for sure! Does it have any advance in it?

 

Not sure, don't believe Geoff said it did. I'll be degreeing it, and he told me to put it in at dot-to-dot and check from there.


Just an update- I ordered the EPS 236/248 mentioned above. Geoff had nothing but good things to say about it.

Now I just need to find a degree wheel (don't know if anyone rents them) and pick a timing set.

 

Hate to say it but a 236/246 camshaft is very close to the specs of the MS3 you already own. I would bet ya $1000 on the engine dyno they're within 3hp. Giving up intake duration with the extra cubes probably makes that camshaft give up a little hp to the MS3.

The reality is when someone sells you a camshaft they haven't tested side by side with any other camshafts they simply don't know what does & doesn't make more power.

You really need to decide how much power you want to gain to make it worth the cost in upgrading. If your ok with 8-10hp then I think if you do something smaller than the Tx Giant you'll be happy. Maybe something like a 243/247. The problem with the Tx Giant is its way to big for this application I think. You might make some extra peak hp, but I think you'll find overall you didn't make any ground.

 

That's why I recommended something in-between. You need to make it worth the swap. The Texas Giant is too big. The EPS I quoted is a custom grind using custom EPS lobes. It's still big for a 370. You might want it on a 110+2 but it will be a beast to tune.

The 236/248 EPS cam will perform a little different from the MS3. The later exhaust duration will allow it to hold on past peak better, plus it has more overlap so it will make more power. Also, it has an earlier IVC, so it should make more avg torque. Overall tho, I don't think it'd be a huge difference - maybe 5-10HP.

 

thanks for the inputs, y'all.

final specs are in on the cam, I guess the EPS site is wrong on the lobes. talked to Geoff

cam specs are: 236/248, 110+3 (107 ICL ), .604"/.604".

the only reason I switched from my ms3 was because the broken rod smacked the **** out of it and it was done. since all cams are close in price, I decided to get something better suited to my build, and the EPS cam should fit the bill nicely. the lobes should be a lot kinder on my valvetrain, and offer a lot more valve control with my heavy-*** YT Ultralites. it might not make that much more peak, but I should wind up with a lot more under the curve right where I want it, and it should from my understanding perform a LOT better.

I plan on degreeing it in at spec. any thoughts?

 

Sounds good! A 107 ICL is pretty aggressive along with that duration! Better have good notches in those pistons lol

 

Diamond -2cc flat tops with valve reliefs. Should clear, Geoff sounded confident it would.

 

Gotcha! Same as mine then

 

236/248 110+3 should rock and roll.

If I did a 370, I'd do the same. It'll roll out on N2O as well.