L82 Cam questions
Thread Starter
6th Gear
Joined: Dec 2017
Posts: 6
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L82 Cam questions
While I don't have a Corvette, my car does have a few Corvette parts(cam, 290hp350 and 67 master cylinder) so I how that make me accepted lol.
I have a 290hp 350 in my 65 Nova, has Weiand Stealth intake, and 600 Summit carb, stock rams horn manifolds and duel exhaust. Th350, stock converter, shift kit, 3.08 gears 215/60 15 tires. I'm looking for more info on the L82 cam, specifically all the timing specs. Can't seem to seem them. Is the cam ground straight I'm up or is the advanced? Would advancing the cam 4° help low end at all? Im not really wanting to change the cam, but would like a little more bottom end. I do plan on adding either some Doug's Tri-Y headers, or some fenderwell headers, along with a set of heads(Vortec or 170-180CC Aluminum). I don't want to change the converter either. Jus optimize what I have. Thank you.
I have a 290hp 350 in my 65 Nova, has Weiand Stealth intake, and 600 Summit carb, stock rams horn manifolds and duel exhaust. Th350, stock converter, shift kit, 3.08 gears 215/60 15 tires. I'm looking for more info on the L82 cam, specifically all the timing specs. Can't seem to seem them. Is the cam ground straight I'm up or is the advanced? Would advancing the cam 4° help low end at all? Im not really wanting to change the cam, but would like a little more bottom end. I do plan on adding either some Doug's Tri-Y headers, or some fenderwell headers, along with a set of heads(Vortec or 170-180CC Aluminum). I don't want to change the converter either. Jus optimize what I have. Thank you.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
IDK where you would get a cam card for a GM L82 cam. Factory cams are normally straight up, aftermarket can vary. Advancing cam will help with bottom end. Tri Y would be the better choice in headers. Different rear gear would help also....something around 3.50. You should change gear before investing in converter.
Thread Starter
6th Gear
Joined: Dec 2017
Posts: 6
Likes: 0
IDK where you would get a cam card for a GM L82 cam. Factory cams are normally straight up, aftermarket can vary. Advancing cam will help with bottom end. Tri Y would be the better choice in headers. Different rear gear would help also....something around 3.50. You should change gear before investing in converter.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
You should " map out" your goals. Many times engines get modded only, leading to poor overall performance. If it's a daily driver and a gear change is not happening, focus on performance below 5000 rpm. Better cylinder heads even if there iron and not aluminum are worth looking into. The cam will work better if engine is at least 9.5+ to 1 compression.
Thread Starter
6th Gear
Joined: Dec 2017
Posts: 6
Likes: 0
You should " map out" your goals. Many times engines get modded only, leading to poor overall performance. If it's a daily driver and a gear change is not happening, focus on performance below 5000 rpm. Better cylinder heads even if there iron and not aluminum are worth looking into. The cam will work better if engine is at least 9.5+ to 1 compression.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
You really need to know how your 350 is put together. Engine code stamped on passenger side of block deck may give you an idea of what you have. The L31 Vortec heads which are widely available used, have to be modified to fit your intake. GMPP sells Vortec heads that accept sbc intakes. World products sell SR (stock replacement) also White Performance offers budget minded heads. Local machine shops can sometimes be a source of good heads that weren't picked up or customers selling the old parts because they are upgrading. "Need to sell the old stuff to buy the new stuff to go faster" I would avoid center bolt valve cover style heads if possible. If you plan to run roller rockers you want them set up for screw in studs. The C3 parts section may be helpful. You need to find out what pistons are in your engine to know what head you need. You could check the casting numbers or marks of your heads to see what you have.
Thread Starter
6th Gear
Joined: Dec 2017
Posts: 6
Likes: 0
You really need to know how your 350 is put together. Engine code stamped on passenger side of block deck may give you an idea of what you have. The L31 Vortec heads which are widely available used, have to be modified to fit your intake. GMPP sells Vortec heads that accept sbc intakes. World products sell SR (stock replacement) also White Performance offers budget minded heads. Local machine shops can sometimes be a source of good heads that weren't picked up or customers selling the old parts because they are upgrading. "Need to sell the old stuff to buy the new stuff to go faster" I would avoid center bolt valve cover style heads if possible. If you plan to run roller rockers you want them set up for screw in studs. The C3 parts section may be helpful. You need to find out what pistons are in your engine to know what head you need. You could check the casting numbers or marks of your heads to see what you have.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
I must of missed the crate engine part. The GM 350 290hp engine is 8-1, with 76cc head, and the cam is similar to the L82.
You should be looking for 1.94 1.50 64-60cc head it will get you 9.5-9.75 compression ratio and should keep you on pump gas regular or mid grade depending on tuning. Long slot 1.60ish stamped steel rockers are a thrifty alternative to the rollers when you change heads. I'm not sure the increased lift from the 1.6 rockers will help on a 8.0-1 engine without a blower. Rollers can always come later.
You should be looking for 1.94 1.50 64-60cc head it will get you 9.5-9.75 compression ratio and should keep you on pump gas regular or mid grade depending on tuning. Long slot 1.60ish stamped steel rockers are a thrifty alternative to the rollers when you change heads. I'm not sure the increased lift from the 1.6 rockers will help on a 8.0-1 engine without a blower. Rollers can always come later.
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Thread Starter
6th Gear
Joined: Dec 2017
Posts: 6
Likes: 0
I must of missed the crate engine part. The GM 350 290hp engine is 8-1, with 76cc head, and the cam is similar to the L82.
You should be looking for 1.94 1.50 64-60cc head it will get you 9.5-9.75 compression ratio and should keep you on pump gas regular or mid grade depending on tuning. Long slot 1.60ish stamped steel rockers are a thrifty alternative to the rollers when you change heads. I'm not sure the increased lift from the 1.6 rockers will help on a 8.0-1 engine without a blower. Rollers can always come later.
You should be looking for 1.94 1.50 64-60cc head it will get you 9.5-9.75 compression ratio and should keep you on pump gas regular or mid grade depending on tuning. Long slot 1.60ish stamped steel rockers are a thrifty alternative to the rollers when you change heads. I'm not sure the increased lift from the 1.6 rockers will help on a 8.0-1 engine without a blower. Rollers can always come later.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
Because of your application oval track, 113 l98, 175-195 cc heads should work. You don't want ports or lift that is too much where torque is lost. The stamped steel long slots 1.65 did a pretty good job for decades before rollers came down in price. There is a benefit to rollers, they reduce friction and wear. They also require additional attention when installing so that roller tip is centered on valve tip, if not bad things can happen. I would be careful buying used parts there are some buttmunches out there, if possible have a knowledgeable person check them out as soon as possible if not at point of sale(POS).
When you get to the point car is not your 100% daily driver and you can make supporting changes. Then think your plan, for now mild mods. a year or so from now maybe something different.
When you get to the point car is not your 100% daily driver and you can make supporting changes. Then think your plan, for now mild mods. a year or so from now maybe something different.
Thread Starter
6th Gear
Joined: Dec 2017
Posts: 6
Likes: 0
Because of your application oval track, 113 l98, 175-195 cc heads should work. You don't want ports or lift that is too much where torque is lost. The stamped steel long slots 1.65 did a pretty good job for decades before rollers came down in price. There is a benefit to rollers, they reduce friction and wear. They also require additional attention when installing so that roller tip is centered on valve tip, if not bad things can happen. I would be careful buying used parts there are some buttmunches out there, if possible have a knowledgeable person check them out as soon as possible if not at point of sale(POS).
When you get to the point car is not your 100% daily driver and you can make supporting changes. Then think your plan, for now mild mods. a year or so from now maybe something different.
When you get to the point car is not your 100% daily driver and you can make supporting changes. Then think your plan, for now mild mods. a year or so from now maybe something different.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
Youll never see a real gain going to roller rockers with that type of cam, the stockers are just fine.
x2 that cam in your eng is almost identical to the l82 I wouldnt seek out another cam that old.
With that gear and budget? Maybe a set of Promaxx heads, Isky 264 mega cam should pick up nicely.
If you use vortec heads you gotta use the intake, too. You can buy them from GMPP or Summit with the upgrades
x2 that cam in your eng is almost identical to the l82 I wouldnt seek out another cam that old.
With that gear and budget? Maybe a set of Promaxx heads, Isky 264 mega cam should pick up nicely.
If you use vortec heads you gotta use the intake, too. You can buy them from GMPP or Summit with the upgrades