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Old 05-29-2012, 08:10 PM   #1
540 vette
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Default Get my L48 to 350 horsepower.

I would like to get 300 to 350 horsepower from the L48 in my car. I don't want to go with a crate engine because of my budget. I have about $2500 to spend. I recently sold a 99 and would like to get about the same hp as that did. I have a basic idea on what I want to do. I just want to see what others would do.
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Old 05-29-2012, 09:09 PM   #2
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How deep are you willing to go into the engine? A head, cam and intake swap will do wonders for it. The Edelbrock package 2022 would fit the bill but I would change the cam, the ones in their packages are really old technology but should be easy on the valve train.
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Old 05-29-2012, 09:14 PM   #3
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My L48 is now a 350 hp 390 Tq motor done by my local engine builder. Its his own version of a GM crate motor. 2 bolt main 9.0-1 compression, Dual pattern comp hydraulic cam non roller. Heads are warmed over 882 truck heads, 1.94 intake 1.60 exhaust. intake is an Eddy dual plane with a 1406 eddy carb.

I dropped off a block crank rods oil pan intake carb and Distributor. He supplied the rest. Put the motor on the dyno, broke in the cam, seated the rings and made some pulls. $3600.00 out the door tax paid. Comes with 6 months/ 6000 mile warranty
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Old 05-29-2012, 09:32 PM   #4
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Headers and exhaust.
Cam, heads and intake. Vortecs are well within your budget.
Tune.

Should get you right there
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Old 05-30-2012, 03:33 AM   #5
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I was thinking about the Performer package from Edelbrock.
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Old 05-30-2012, 06:36 AM   #6
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The following link is to a thread I posted with some rear wheel chassis dyno data from my build up. The cam gave the largest power increase but I doubt the results would have been the same if the other modifications were not in place.

http://forums.corvetteforum.com/c3-t...mp-xe268h.html

It is important to note that since I finished the motor, I had to upgrade the torque converter to a 2800 stall and switched the rear end to a 3.55 unit in order to make the car operate in the cams power band.

Chevy High Performance did a series years ago about the Vortec heads and matched it with a comp cam xe268h cam. It's going to take both components and new heads can get pricy quick. You may find something interesting on craigslist...
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Old 05-30-2012, 09:46 AM   #7
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Quote:
Originally Posted by 540 vette View Post
I was thinking about the Performer package from Edelbrock.
You won't see the number they advertise with your low compression pistons
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Old 05-30-2012, 09:52 AM   #8
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use your old engine as a core and build it to a L-79`s specifications and you engine is still all stock appearing with its correct numbers...the result, 350hp
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Old 05-30-2012, 10:11 AM   #9
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I have a very tired L48 motor also. I have chosen to go the crate route.

Take the time to look at www.phoenixengine.com they can give you the motor you would like for your budget.

Also, take a look at Jeggs or Ecklers they offer Chevy crates 290 hp for just under $2K.

Good luck. Let us know what you decide to do.


P.S. If I have unintentionally committed a forum faux pas by suggesting a vendor that is not listed on the forum, then I apologize. Good day.
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Old 05-30-2012, 10:21 AM   #10
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Jegs has a couple of crate engines with what you're looking for in your price range and are offering free shipping.
I myself would build the engine into a 383. I loved the feel in my 77 many years ago.
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Old 05-30-2012, 12:16 PM   #11
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AFR 180 heads about 1500-

Cam in the 220ish range @.050 FT or hyd roller take your pic. Big price difference. Even throwing an Isky 270 mega cam at it would work.

Good used dual plane intake
650+-carb
1-5/8 primary headers
Recurve your distributor
roller rockers possibly pushrods
Gaskets fluids
Should creep up on 350 at the tire Id bet and be close to budget. Perhaps a touch over but youll love how it runs.
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Old 05-30-2012, 08:00 PM   #12
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Default The L48 is very similar to the GM crate 350".

You really should review the series of acticles by Chevy Hi-Performance on a GM crate 350". This should give a good idea of it takes to get a low compression 350 to over 400hp. Take a look: http://www.chevyhiperformance.com/te...ild/index.html

http://www.chevyhiperformance.com/te..._ii/index.html

http://www.chevyhiperformance.com/te...iii/index.html

http://www.chevyhiperformance.com/te..._iv/index.html

Hope this helps ya,
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Old 05-30-2012, 09:24 PM   #13
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Quote:
Originally Posted by Jedi926 View Post
I have a very tired L48 motor also. I have chosen to go the crate route.

Take the time to look at www.phoenixengine.com they can give you the motor you would like for your budget.

Also, take a look at Jeggs or Ecklers they offer Chevy crates 290 hp for just under $2K.

Good luck. Let us know what you decide to do.


P.S. If I have unintentionally committed a forum faux pas by suggesting a vendor that is not listed on the forum, then I apologize. Good day.
I would do some research before dealing with phoenix engines.
http://www.ripoffreport.com/director...ix-Engine.aspx
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Old 05-30-2012, 10:12 PM   #14
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I really don't want to pull the motor from the car. I will tear it down to the short block and add heads, cam, intake and carb. And headers. I am going to order a set of Hookers probably tomorrow.
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Old 05-30-2012, 10:50 PM   #15
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Do your self a favor, don't skimp on the heads, there are many good heads out there & there are tons of cheap heads, nothing out there in the line of good cheap heads. I favor afr, great flow with hogging out the ports. they really can't be beat in the 23 degree head category.
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Old 05-30-2012, 10:57 PM   #16
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Quote:
Originally Posted by 63mako View Post
I would do some research before dealing with phoenix engines.
http://www.ripoffreport.com/director...ix-Engine.aspx

Thanks 63Mako, just read the reports, that will make me think twice about using this shop. Everything I read was positive. Great tip.
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Old 05-30-2012, 11:19 PM   #17
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Quote:
Originally Posted by Jedi926 View Post
Thanks 63Mako, just read the reports, that will make me think twice about using this shop. Everything I read was positive. Great tip.
No problem. I remembered a forum member a few years back that had major problems with no resolution so I did a quick search.
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Old 05-30-2012, 11:23 PM   #18
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Quote:
Originally Posted by cuisinartvette View Post
AFR 180 heads about 1500-

Cam in the 220ish range @.050 FT or hyd roller take your pic. Big price difference. Even throwing an Isky 270 mega cam at it would work.

Good used dual plane intake
650+-carb
1-5/8 primary headers
Recurve your distributor
roller rockers possibly pushrods
Gaskets fluids
Should creep up on 350 at the tire Id bet and be close to budget. Perhaps a touch over but youll love how it runs.
Great advice! Look at the Howards cams at Summit. $500 gets you a billet core retro hydraulic roller and lifters. AFR heads need the +.500 lift of a roller cam to get the full benefit of the heads.
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Old 05-31-2012, 09:15 AM   #19
540 vette
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Quote:
Originally Posted by 63mako View Post
Great advice! Look at the Howards cams at Summit. $500 gets you a billet core retro hydraulic roller and lifters. AFR heads need the +.500 lift of a roller cam to get the full benefit of the heads.
I was thinking Performer RPM heads and definitely a roller hydraulic cam. I don't know what size yet. Also a performer intake and probably a 750 vacuum secondary holley. I am ordering the headers today. I also guess I will keep the HEI.

Last edited by 540 vette; 05-31-2012 at 09:22 AM.
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Old 05-31-2012, 09:22 AM   #20
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Quote:
Originally Posted by 63mako View Post
No problem. I remembered a forum member a few years back that had major problems with no resolution so I did a quick search.
Being that I am 2k miles away from Phoenix, that could have been a disaster for me. Their website is very misleading then. I will be looking at the GM site again and just go with them.
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Old 05-31-2012, 09:22 AM
 
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