so i finally got the itch to put a cam in my L48 and wow! my first dyno with only headers it made 197hp at 4200 and 254tq at 3600. after intake, carb rebuild, new timing chain and recurved distributer it made 205hp at 4300 and 266tq at 3500. and after the comp cam 12-210-2 it made 234hp at 4700 and stayed flat to 5000 and 277tq at 4000 and stayed flat to 4700. next will be a better carb, see if i can hit the 250 hp mark!! and this was on a 77 L48 th350 and 3.08 gears with 255/60/15's on the factory alu wheel. i have a TKO 500 coming in next month and another dyno will follow. so total mods ive done so far is. recurved dizzy, edelbrock 2101 intake, headers/sidepipes, weiand high flow water pump, timing chain and cam. after the carb i have a set of L82 heads i will be putting on it with a 3 angle valve job and have them gasket matched and shaved to get away from the pathatic 8.5 comp ratio. i hope this helps someone

 

contrary to what some will tell you the 882 heads are a decent head. if you can unshroud the valves and do a little bowl work along with your valve job you will have a nice set of heads, your effort would be well rewarded. or you can spend more and get an aftermarket set that may or may not be better.

 

i love the 882's. they are easy to find, flow pretty well seeing as when they came out, they ALL have harden valve seats, and as long as you keep them cool, IE under 230 degrees they will last for a very long time.

 

Not too bad for a L48 I would say. When you rebuilt the carb, was it a stock rebuild or did you make some modifications to improve performance? There is plenty that the Q-jet can do with some mods. I made 30 some mods to my q-jet on it's rebuild and it was a completely different car after that. Mine is a 77 L-48 also.
Modify the intake somehow to let more air into the engine and you'll get plenty more performance. The stock air intake is not sufficient for the engine once you get rid of the stock restrictive exhaust.

 

It has the edelbrock 2101 intake, i wish i went with the street warrior. It was a stock rebuild. Im waiting on a reply from lars for info on what i should do to it. I love q-jets, the sound they make at WOT is amazing

 

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That is pretty impressive for a 77 L-48. Above is my 78 L-82 dyno run with a Holley 4175 650 Qjet replacement (on the engine since 1985), McJacks shorty Headers with 2.5 inch duals and Monza Turbo mufflers, K&N air filter in the stock dual snorkel air cleaner housing, and 1.5 comp cams roller TIPPED rockers, not true rollers. Everything else is totally stock including the cam and 882 heads. A friend of mine that use to built motors and then owned a high performance parts place in the 90's has repeatedly told me that the 882 heads (especially the big valve L-82 heads) actually flow very well and like stated above, the issue is high engine temperature which cracks the heads. My bone stock L-82 when new would routinely run 225-240 degrees on hot days. I fixed that long ago-runs 175-180 now!I am getting ready soon to rebuild the 882 heads (minor porting as well, gasket to head matching and Felpro .015 head gasket to bump compression a tad ) and thinking of a voodoo 262/268 cam to see how much more i can get than 233 RWHP with the stock 882's cleaned up/rebuilt and a slightly more aggressive cam. I am hoping for 275 RWHP with the renewed 882 heads and the cam. We will see? Want to keep it an L-82 as much as possible.

 

is this rear wheel or at the flywheel? I also have a 77, with recurved dizzy and exhaust. Im planning on maybe doing cam and head swap.

 

The carb on there is quite good. Get the AFRs dialed in and save some $$.

Assuming you're still running the stock carb, of course...

 

good job

 

It was wheel hp on a dyno jet dyno. It has the q-jet on it still. I already have a carter AFB 600 here at the house and was going to run it till i ship the carb to lars and get it back, i love q-jets