L48 w/ vortec heads

[Scooter76]

I have decided to build up my L48 a little bit. I would like to hear any opinions as to how it may run. Heres what I am going to do:

Vortec heads upgraded to handle .520 lift.
Performer vortec intake, keep the origional Q-jet.
Comp extreme energy 262/270 cam. (218/224, .493/.500 (1.6) 110 LCA.
1.6 roller rockers
TCI converter 2000 stall
Headman headers, dual exhaust, no cat.

I'm hoping for 325 or so hp. while still being a mild combo.
I thought about going the crate motor route, but the budget is keeping me from it.

Thanks in advance

 

[Blue82]

I went a similar route with my '82 (see sig.). You will like the hp/torque and 325 should not be a problem. CHP built a similar engine with a stock GMPP bottom end a nd the XE268 cam and they put out over 400 hp/torque at the flywheel.

Good luck

 

[macx]

Here's that GMPP 350 build

Here's a link to that GMPP article -
I've been researching a modest cost
build for mine, had about set on this
setup although hoping to score a
hydr roller reasonable. This story has
about got me convinced to do a
Comp Cams 262 (they recommend it over the 268 they used, saying it would do more torque in driving rpms without noticeable horsepower difference).
I was amazed at their final results with upgraded Vortecs.

http://www.corvettefaq.com/c3/goodwrench/GM Goodwrench 350 test part 1.htm

Also, just FYI, right now there are upgraded Vortecs on ebay that are good for like .550"lift instead of the .510" like most of them - also have the larger valves, just a slight tad more than the other upgrade versions.

I'll find out the vendor and post here.

In the meantime, here's a bunch of righteous buildups with non-exotic parts.

http://ryanscarpage.50megs.com/combos2.html
http://www.geocities.com/MotorCity/7610/dyno.htm

 

[macx]

Upgraded Vortecs

Here's 3 sources - one offers with springs good to .550, one offers larger valves.
You could probably get one of them to do both.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&category=33617&item=2434861923
http://www.stores.ebay.com/id=57602088&ssPageName=L2
http://cgi6.ebay.com/ebaymotors/ws/...id=yoders81&include=0&since=-1&sort=3&rows=50