i recently upgraded my 70 L-82 engine

double hump heads, with after market valves and had them machined
Dual 2 1/2 exhaust magnaflow
hooker headers
new cam from summit racing
new water pump
Edelbrock intake
Edelbrock 650 Carb
Roller rockers
hardened push rods

new plugs
New Distributor cap
New plug wires


Does any one have any idea what kind of Hp i should be getting out of it?

thanks for the input

 

There was no L-82 in 1970, did you mean 1979? What is the compession, what size are the valves, which cam shaft, etc.

 

what size chambers in the head too and which cam

 

Around 2000hp/2500tq.

 

Enough to push the car down the road.

Seriously you need to provide more info. What are the cam specs and what was done to the heads. Any port work.

 

I thought those kinds of numbers were only achievable with chrome valve covers??

 

What intake?
What are the cam specs?
What size headers?
What is the compression?
Any porting to the heads?

 

With the information you have provided.....no. Nobody knows. It's a mystery, wrapped in a riddle, surrounded by an enigma, viewed though a fog, and I'm not wearing my glasses, either. Dish out the info bluedawg mentioned.....it'll be a start.

Scott

 

1.9 valves
57cc chambers
polished ports

 

edelbrock performer intake

 

the key now is cam specs. cmon, you can do it

 

with chambers that size on an L-82 you would be north of 10-1 compression which if you had the stock cam but 2.02 valves in the head id say your close to 350 h.p. because you have the headers . i base this on the fact that the last N.H.R.A rating for that engine stock was 315 h.p. and with over 10-1 compression you should be close to that figure
if your cam is milder it may be less truthfully ,with the small valve heads even with a bigger cam i doubt its much more than i quoted. it would take the larger valves and some good bowl and runner work to get 375 h.p . with a decent advance curve in your distributor and the carburetor set up properly it should run pretty well. i think your carburetor may be a bit small for all out performance but it shouldn't be too bad. are you sure about your ports being polished? usually combustion chambers are polished. and on a street engine it is almost pointless.

 

Here is the Cam that i installed

http://www.summitracing.com/parts/SU...52/?feedback=1

thanks

 

Little cam....

Maybe 350hp


Brand:Summit Racing
Manufacturer's Part Number:SUM-K00052
Part Type:Camshaft Kits
Product Line:Summit Racing Street & Strip® Cam Kits
Summit Racing Part Number:SUM-K00052

Cam Style:Hydraulic flat tappet
Basic Operating RPM Range:1,500-5,000
Intake Duration at 050 inch Lift:218
Exhaust Duration at 050 inch Lift:218
Duration at 050 inch Lift:218 int./218 exh.
Advertised Intake Duration:284
Advertised Exhaust Duration:284
Advertised Duration:284 int./284 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.458 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.458 in.
Valve Lift with Factory Rocker Arm Ratio:0.458 int./0.458 exh.
Lobe Separation (degrees):110
Computer-Controlled Compatible:No
Lifters Included:Yes
Lifter Style:Hydraulic flat tappet
Valve Springs Included:No
Retainers Included:No
Locks Included:No
Valve Stem Seals Included:No
Timing Chain and Gears Included:No
Assembly Lubricant Included:No
Pushrods Included:No
Rocker Arms Included:No
Gaskets Included:No
Valve Springs Required:Yes
Camshaft Manufacturers Description:Lopey-rough idle, excellent midrange power in street vehicles. Likes 9:1 and higher compression and works with stock converter.
Quantity:Sold as a kit.
Notes:Includes SUM-1065 camshaft.
In-Store Pickup:Choose In-store pick-up (OH, GA, NV) on our web site.
Here's a simple high performance solution! These American-made Summit Racing Street & Strip® Cam Kit contains a straight-grind, hydraulic flat tappet camshaft along with the matching lifters. The tight lobe separation will boost your torque, throttle response, and mid range power for exciting action at the track and on the road.

 

What kind of Cam should i have got for more Hp and would it have been that big of a jump in HP?

 

thats not far off the L-82 cam and if tuned right it should be a good running set up, i suspect you need your distributor set up . contact Lars and get his timing papers.
if you want more power you need to change your heads too. a cam at this point can only do so much.
i am thinking you don't have this tuned anywhere near right. close to 350 H.P should move this car pretty well.

 

These r not the l82 heads these r double hump heads that have been ported polished and after market valves... And milled... We r still looking at 350?

 

They are still old GM heads...Even with work they dont perform as well as most of even the lower end performance heads that come cast without headwork...
I think the cam you have matches the rest of your components well... you dont want a big cam unless the rest of the engine can support it and even then you would need to change the gears in your rear end and get a higher stall converter and then you may not like how the car behaves on the street...
we are really just guessing here... You can always put it on a dyno and find out.... 350hp at the crank is still 250-275hp at the rear wheels.... much better than stock!

 

I have no idea what your heads flow... but that cam is pretty much stock L82.... if you want to stay flat tappet (I would not do that unless budget demands) the Edelbrock Performer RPM ran real well for me... its specs:


283-400 V8 (1957-86) 7102 234° / 244°@50 .488" / .510" 112° 107° 11"

and change to a RPM air gap....but thats me...you may like it more mild... but i do not think this is to much...

 

i understood you have "double hump " heads. there are as many ways to port a pair of heads as there is stars in the universe. some people can "port" a set of heads and completely ruin them . instead of splitting hairs on a 350 - 375 rating, get the distributor and timing and your carburetor optimized and enjoy it. you have a close to perfect " i drive it every day and it kicks butt" car. with the right gear and tuned properly you should have a solid 13 sec 1/4 mile ride. even today thats not too bad at all. some of these new cars can run a number but the clown driving it will never get there. stop arguing and start tuning back in the day i put combinations close to what you have together for people an everyone was happy. if you want 400 horsepower aftermarket heads are the key.