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vortec cam

  
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vortec cam

 
jeff-#005 jeff-#005
New User | Posts: 4 | Joined: 04/07
Posted: 04/06/07
06:59 AM

i have a stock vortec motor 5.7l i'am wondering what the specs are on the cam, i believe the cam part # is 10241264. i also have a cam from a marine motor the # is 14097395. will i find more power if i swap to this cam. i kinda want to avoid costly head mods, just looking to get a little more power. it is all going into a 81 malibu wagon with a 700r4 an 3.42 rear gears. thanks.  

oldbogie oldbogie
Guru | Posts: 1195 | Joined: 08/03
Posted: 04/06/07
03:03 PM

The 10241264 is standard L-31 Vortec fare. It's a mild roller with a fairly wide LSA. Specs are at .050 lift and a 1.5 rocker 191 intake with .414 inch lift, 196 exhaust with .428 inch lift the LSA is a computer controlled wide 111 degrees.

The 14097395 is a bit more aggressive from .050 lift and with a 1.5 rocker its intake is 196 degrees of duration and .431 inch of lift, the exhaust is 206 degrees with .451 inch of lift. Its LSA is a computer/SMOG unfriendly 109 degrees. This cam with Vortec heads would move the power up from 265 or so with the 264 cam to around 300-315 with the 395 cam. This will run with Vortec heads without the need to modify them.
The idle will be a little lopey, if using computerized fuel injection a new program would have to be loaded. This would SMOG with an AIR pump and 3 way catatylic converter if you need to.

Bogie  

jeff-#005 jeff-#005
New User | Posts: 4 | Joined: 04/07
Posted: 04/06/07
04:05 PM

thanks old bogie. very helpfull. now my next Q, if i take the vortec cam an install it in a 88 305 will it boost the power, yes it is a roller cam block. also i'm going to be running a edelbrock performer an 6oo holley on the vortec motor, headers into flowmasters. with my combo the 700r4 an 3.42 gear will the car run pretty good, i mean power if i hit the loud pedle. thanks again.  

oldbogie oldbogie
Guru | Posts: 1195 | Joined: 08/03
Posted: 04/06/07
04:33 PM

I'd need to know the model of 305 there's low power and high power version. The Vortec cam would wake the low output engine up.

The low output LO3 used TBI and developed about 170-185 hp.

The high output LB9 used TPI and was rated 190 to 215 hp.

For a fairly mild street engine, putting a set of 1.6 rockers is a pretty effective way of picking up 15-20 hp, without having to get deeper than the rocker covers.

Are you talking two different engines one 305 the other 350?

Bogie  

jeff-#005 jeff-#005
New User | Posts: 4 | Joined: 04/07
Posted: 04/06/07
07:48 PM

1st they are two engines, i purchased a bunch of old motors from my friend that owns a machine shop. people bring the stuff in to get it redone an never come back for it, so after a year he sells it cheap. this year i scored pretty good, 50$ for a complete 5.7l vortec different tpyes of heads cams everything. so now i have been sorting through the stuff an my mind is going crazy with different combos. i have friends who purchase this stuff from or i trade for other car stuff. iknow this is a #1 chevy site, but i scored blue blocks also, i have sold a bunch of the stuff already an there are a few items i thinking about keeping for my own cars.my guess is that it is a lopo 305.once again thank you for all the info, your a book of knowledge.  

jeff-#005 jeff-#005
New User | Posts: 4 | Joined: 04/07
Posted: 04/06/07
08:04 PM

the wagon i have does run right now with a 0.40 over 350 flat tappet cam crappy heads edelbrock intake an a Q-jet. i'm just wanting to update with the vortec motor.thanks  

oldbogie oldbogie
Guru | Posts: 1195 | Joined: 08/03
Posted: 04/09/07
08:54 AM

I guess where I'm going in wanting to know which 305 you'd start with is from the assumption that you're not modifing the short block ie pistons specifically I'd need to know how to compute the static compression ratio. Although the CR difference isn't much different on these engines.

The more aggressive "395" cam would want more compression than the "264" to keep the torque curve up.

The vortec combustion chamber is about 8 to 10 cc bigger than the 305 so the static combustion ratio will come down. You want to aim at a CR of around 9.5 with the "395" cam. So adjustment to the piston selection may be necessary to get there. Flat-top or D dish being the prefered design choice to keep an aggressive quench/squish deck opposite the spark plug and valve pocket. You want to keep the deck clearance between .030 and .060 with the piston at TDC, this will drive deck heigth milling and or gasket selection. Keeping this tight enhances detonation resistance.

The 395 cam and Vortec heads with an Edlebrock intake and Holley 600 should bring you in to around 265 to 285 hp at 5600 RPM. A little better selection of valve spring such as Comp's Beehive would probably let the engine produce about 290-300 at 6200 revs.

Bogie  

jokerZ71 jokerZ71
New User | Posts: 22 | Joined: 05/13
Posted: 05/04/13
09:45 AM

I know this thread is old,but, I'm currently building a 97 vortec engine for my Z71.It's the original motor I pulled w/ 250,000 miles.Ran good.Just low oil pressure.The Goodwrench crate I replaced it with has 280,000 now & having the same problem,so'i'm rebuilding the original motor for replacement & planning on running this cam along with some 12 cc D pistons & tightening up the quench over the stock .053.With a .015 deck & .028 headgasket I'm coming up with about a 9.5:1 SCR & a DCR of 7.5:1. I can't seem to be able to find the IVC for this cam,or,the true LSA even after calling GM & checking everylace I know of.Anybody used a similar combo with this cam.  
97 Z71 extended cab,5.7,4L60E,285/75-16,American Outlaw Buckshot Wheels.528,000 miles.

jokerZ71 jokerZ71
New User | Posts: 22 | Joined: 05/13
Posted: 05/04/13
10:07 AM

Some say LSA is 112 w/ICL of 109.Some say both are 109.Nobody @ any of the GM  parts ppl can tell me either.Even different GM sites list it both ways.  
97 Z71 extended cab,5.7,4L60E,285/75-16,American Outlaw Buckshot Wheels.528,000 miles.