Gunny Highway

iTrader: (1)

350 TBI

Cam 1:
204 214 / .423 .446 / 110

Cam 2:
204 214 / .249 .452 / 116

So what do you think is there to gain between these? I would think the 116 lobe is better for the computer, but I'm really not sure.

Dewey316

the 116 LSA cam will have a flat lineir power curve, the 110 will have a higher peak, but not as flat.

yes the 116 will be more friendly, and have less lopety lope at idle. power wise they will be similar, the 110 will have a higher peak, the 116 will be a lower number, but a flatter curve.

Gunny Highway

iTrader: (1)

so you think the lift difference is negligable?

ShiftyCapone

iTrader: (7)

Since the duration is the same for the two it will make a little differnce but not much. Both are pretty mild but the 116 is the way I would go. My cam has a 111 LSA and I am pretty sure I will have some lope after I am tuned. I think you have a typo in your second cam specs there. Isn't that supposed to be .449?

AJ_92RS

Just using it as a guide, but DD2000 showed more torque and HP with the 110 LSA cam EVERYWHERE in the RPM range. Even at 2000 RPM.

What's the advertised duration on those cams? And who makes them?

Dewey316

the 116 will be much more computer friendly

my cam is 272/282 206/216 .447 .447 112

it idles at over 50 Kpa at 700rpm

but boy does it pull when you get on it about 3500

AJ_92RS

But this is a 350, not a 305.

If it makes you feel better, get a cam with 112 LSA/108 ICA. There are gobs of them out there.

Dewey316

sorry, i did not see it was in a 350.

in a 350, both of those are VERY mild cams.

Gunny Highway

iTrader: (1)

Well, supposedly with the 116 cam in an LO5 with a Holley 670 and some headers, the engine made 320 HP and 399 lb/ft at the flywheel. Not too shabby.

If you could grind a custom cam for a TBI 350, what specs would you use?

P.S.- I believe the 116 cam is the CompCams 2030, but I can't find it anymore, because they've changed their website.

Gunny Highway

iTrader: (1)

Woops, my bust. I was thinking Comp Cams, when it should have been Compucam 2030 Here's the link to the page:

http://www.cranecams.com/?show=brows...tType=camshaft


But I can still say that those HP and Torque numbers are correct per Rich92RS350. But the question still remains, if you could custom grind a cam, what do you think would be the perfect grind for a 350 TBI for the street?

P.S.-How much does a custom grinded cam cost?

Dewey316

have you considered teh LT4 hotcam? it would be a very nice fit in a street 350. and it can be had for a resonable price. it is also a proven performer, lots of people make good power with it, and it is relativly computer friendly.

ShiftyCapone

iTrader: (7)

I agree. The Hotcam is an great performer that is capable of 430hp in certain applications yet remains tunable for various types of EFI.

seanof30306

iTrader: (4)

with 218/228 duration @ .050, would the lt4 hot cam make enough vacuum for the map sensor?

i talked to mark engle at engle cams the other day about cams. he suggested two, saying he'd had a lot of good results from them in 350 tbi applications:

cam 1: mild

intake lift: .479 w/1.5 rockers, .510 w/ 1.6 rockers
exhaust lift: .492 w/1.5 rockers, .525 w/ 1.6 rockers

intake duration: 212 @ .050
exhaust duration: 218 @ 0.50


cam 2: wild

intake lift: .492 w/1.5 rockers, .525 w/1.6 rockers
exhaust lift: .492 2/1.5 rockers, .525 w/1.6 rockers

intake duration: 218 @ .050
exhaust duration: 224 @ .050

both cams on a 112 lsa and both cams using 1.6 rocker arms on intake and 1.5 rocker arms on exhaust.

hmmmmmmmmmmmmmmmmmm

hold on

i just realized that his "wild" cam is almost exactly the same as the lt4 hot cam.

actually, it IS the same as the lt4 hot cam. the specs on the lt4 hot cam are .525/.525 - .218/.218 @ .050, 112 lsa. the lt4 hot cam uses 1.6 rockers.

the only difference is that he recommends 1.5 rocker arms on the exhaust. you could do the same with the lt4 hot cam.

regardless, gunny, i think the problem with both of the cams you're looking at is lift. you'll be leaving a lot of power on the table with both of them. at the very least, i'd find out what the specs on those cams will be with 1.6 rocker arms. you're going with bigger heads and a bigger throttle body, you need enough cam lift to utilize that breathing potential.

Dewey316

it works fine. it isn't he first 350 it has been used in, nor the first MAP based one. my car runs GREAT and idles above 50Kpa

ShiftyCapone

iTrader: (7)

Yea it should be fine. Now for a 305 it may be a bit wild but would be awesome in a fully tuned 350 TBI. You are going to need a good fuel pump and a larger bore TBI unit to get anything near what that cam is capable of though.

Gunny Highway

iTrader: (1)

What would cam #2's specs be with 1.6 rr's?

Dewey316

204 214 / .249 .452 / 116

becomes (duration is not going to be dead on)

about 205-206/215-216 .479 .482 116

typicaly 1.6 add about 1.5* duration @ .050, and of course the (Lift)/1.5 * 1.6 for the lift. your LSA and centerlines will stay the same

Gunny Highway

iTrader: (1)

Well, that's a pretty good improvement then.

Hmm. . . that cam with some trick flow heads w/ the bigger valves, some 1.6 RR's and a 2" TBI ought to be down right fun?

Dewey316

i would still give it more cam, if it was me.

i am running a 206/216 cam in my 305

camaro89rs355

I have a 355 TBI and im going to be running a lt4 hotcam with 1.6 rockers and a set of ported and polished vortec heads. What do you guy's think about that setup

lo-n-slo

heres a handy little cam chart I found, It covers a lot of the popular ones!!!

http://www.malcams.com/legacy/misc/CamData.htm

1993GMCPU

Looking for a little more performance myself out of a cam and wondered if anyone's used Summits Hydraulics?

Presently running a 212-218 444 lift 1.5 using 1.6 Comp Rockers, 12-402-4 Comp Grind, but a little weak for me in 350 may sell this and 3704 Edelbrock TBI manifold.

I was just not sure how much 590 CMF TBI could handle and not throw MAP into thinking it's under a load and maybe richen it up to much! Most of the street comp cams have about 4 degees advance in them which I believe you can verify by taking intake centerline and subtracting it from 114, in my case listed above.

Hot cam works ok on TBI's motors?

Other cams I am looking at and hoping to use a grind that may work in 383 next year because I need the extra torque are as follows:

214/224 @.05 442/465 LSA 112
224/224 465 LSA 114
224/234 465/488 LSA 114
215/225 453/477 LSA 112/108 Int. CL
216/228 454/480 LSA 112 Crane
216/228 454/480 112 LSA/107 Int. CL Lunati
220/230 465/490 112 /108
218/224 464/470 114LSA/110
218/224 462/477 112 /110

Probally more computer friendly then RPM cam or Lunati 235-240 490 Lift 112 LSA. RPM is rated 1500-6200 which sounds cool, but I am not wanting to not be able to adjust TBI/ECM and with 1.6 rockers there all close somewhat and assume will be noticable. Plus, I am checking out link listed above.


Motor is bored 40 over and since Pro never sent valves with Torker heads, 67 cc 2.02's, I may use 76 cc with 1.94's shaved .020 and either head with a Fel Pro 1094 (.015) head gasket. Checking on a good sealing gasket for TBI, Edelbrock Manifold until I sell 3704, blocked Exhaust crossover. Pretty close to first cam I used, Comp 12-388-4, 206/212 425/440 112 LSA. Thanks, yea rollers are a bit high and heard they have more HP, but I am hoping to learn ECM PROM programming and change cams! Flow masters, but no headers yet because shorties I got from Sum... seem to leak a lot and went back to what sprint car's used which was a truck exhaust manfold to my surprise! Also seem some Lunati/Comp and others make a 350-325 327 cam, but not sure yet which I will use, but it's got to be noticeable not stock sounding. Heads 766 SR's, maybe sell them later and get valves for 2.02 heads at the way it's going now, 2.02's were sent to replace 1.94 but Bare was a surprised I did not expect after waiting two weeks~!

Past Tulsa by OSU TECH

lo-n-slo

hey 1993GMCPU,

Where in OK are you? I live in between durant and the TX border. Is the cam you inquire about gonna be used in your '93 truck, If so i recommend that you look into the crane powermax 2030 hydraulic cam, loads of people have used them in 87-95 chevy/gmc trucks with success. I personal would put one in my '94 truck but i switched it over to roller. Crane makes a version of the 2030 cam in hydraulic roller, for a whopping $265, so I am contemplating if i want to spend that much right now. After all the hype i have heard about it in truck and SUV applications it might be worth a shot. If your interested head on over to Fullsizechevy.com and do a search for 2030 in the forums. There are several guys over there that have used it. If you need any more information let me know.

Later

1993GMCPU

Consideriing what were going to do with truck, have a complete air bag system, once I get well enough to figure that project out!

Presently just a Stull phantom grill, cowl hood, port through was two 18s not setup for 4-12R Alpines, but sealed prefer ported or bandpass if I can find specs. Boyd 345-55-16s back but truck would like a little more HP and especially 383 power! Has 4" dually style rear fenders even looked better with MT's 15.50-28-15s, may look for a lower profile 16" tire later then 345s since offers on truck, were ridicouslly weird.

We were going to sell it, but no real offers, because we at one time looked at Z28 or Trans am with TPI's lot more cam choices, but it took for ever to get heads promised around 6-03 switched out from Pro.

Just thought bigger heads, cam more compression would be a great uipgrade!

lo-n-slo

sounds like a nice truck, you got any pics?