Camshaft question
Thread Starter
2nd Gear
Joined: Jul 2021
Posts: 2
Likes: 0
Camshaft question
I have a 77 with the L82 stock engine that just wiped out the cam & lifter. My question is i have a crane cam& lifter part # 113542 that has been laying around here for a while. The lift is int 491 - exh 497 & duration is 236-244. Will it work without an issue It is a 4 speed with 373 rear
Race Director
Joined: Nov 2006
Posts: 13,329
Likes: 7,901
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
Pretty sure the stock heads will be fine with that. I put 1.6 rockers on mine with the stock cam and heads a few years back with no issues. Pretty close to the same lift then. I'm no longer running stock heads or cam. but I did run this for several years.
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
You have, maybe 8.5 compression ratio at best. That cam is designed for well over 9.5 C.R. You don't have enough compression.
When a cam starts inching above 480 or so lift, with 280 or so duration, you should have some serious C.R.
If you look at a Magnum cam from Comps with 280 / 480, it states: Must have high compression, tall gears.
Description also states lopey / rough idle.
You can't just slap "lopey in a stocky".
It a nut shell, stock engine, stock compression: it will run like shet.
When a cam starts inching above 480 or so lift, with 280 or so duration, you should have some serious C.R.
If you look at a Magnum cam from Comps with 280 / 480, it states: Must have high compression, tall gears.
Description also states lopey / rough idle.
You can't just slap "lopey in a stocky".
It a nut shell, stock engine, stock compression: it will run like shet.
Last edited by HeadsU.P.; Jul 21, 2021 at 08:43 PM.
Tech Contributor
Joined: Aug 1999
Posts: 14,384
Likes: 6,411
From: At my Bar drinking and wrenching in Lafayette Colorado
Way too much cam for a stock, low-compression engine. That will not run well. In your otherwise stock engine, I wouldn't go any bigger than the spces on the XE268 (which was designed as the biggest cam you can run, and have it run well, in that low-comp engine), which is 224/230° .477"/.480". Anything bigger than that in your engine will cause some really lousy performance characteristics.
Lars
Last edited by lars; Jul 21, 2021 at 08:30 PM.
Pro
Joined: Jul 2021
Posts: 719
Likes: 156
this summit K1103 C&L kit (214*/224* .444"/.466" 112*) will probably run better, torquier & peppier in traffic than OE L82 cam did.
About same lifts but about 8-10* Less intake duration and about 2* less LSA. https://static.summitracing.com/glob.../sum-1103a.pdf
https://www.summitracing.com/parts/sum-k1103 cam with lifters about $154 delivered
About same lifts but about 8-10* Less intake duration and about 2* less LSA. https://static.summitracing.com/glob.../sum-1103a.pdf
https://www.summitracing.com/parts/sum-k1103 cam with lifters about $154 delivered
Pro
Joined: Jun 2021
Posts: 505
Likes: 230
The stock l82 cam was 222 duration 450/460 lift and 114 lsa. The Comp H268 is close to that but 110 lsa so it will lower the torque curve and add some lope. Summit sells some close to the H268 also but cheaper( Elgin grinds I think). That’s probably a good choice for your combo without swapping heads.
I ran the H268 with 9:1 compression and it was fine.
I ran the H268 with 9:1 compression and it was fine.
