Cam question Comp cam Extreme energy

pedal2themetal · Aug 7, 2025

HI,
Is this cam going to be talkative ... have some kind of lope. Sound bite if you have one. OH its in my 1975 318..
OH I had to change to different springs . What came with it were almost an inch taller and wouldn't work , My machinist Didn't want to install them as he said he would have to machine the spring pockets like 60 thousands and was afraid he'd brake thru to the water jackets.. and that pressure might wipe out the cam..

COMP Cams K20-222-3 COMP Cams Xtreme Energy Cam and Lifter Kits | Summit Racing

Free Shipping - COMP Cams Xtreme Energy Cam and Lifter Kits with qualifying orders of $109. Shop Camshaft Kits at Summit Racing.

www.summitracing.com

Cam/Lifters/Valvetrain, Hydraulic Flat Tappet, Adv. Duration 262/270, Lift .462/.470, Mopar, 273-360, Kit

DanielSlocum · Aug 7, 2025

Thats not a big cam that requires taller springs. You should be able to run aprox stock installed height springs which have damper coils and are a little stiffer than the factory 340 springs. No machining of the spring seats required.

496 polara · Aug 7, 2025

I would expect that to have a slight lope in a 318. Certainly wouldn't want any larger cam without a bunch of supporting mods.

pedal2themetal · Friday at 8:58 AM

DanielSlocum said:
Thats not a big cam that requires taller springs. You should be able to run aprox stock installed height springs which have damper coils and are a little stiffer than the factory 340 springs. No machining of the spring seats required.

HI,
Yes that's what we did.. That kit came with huge springs (almost 1 inch taller than the stock ones) and the wrong locks they sent 4 groove locks). we (my Machinist and I) order different springs way shorter with damper coils and the proper locks.. The kit only came with 4 groove locks the the 318 has 2 and 4 groove locks .. I won't order kits anymore..

dodgeboy440 · Friday at 9:05 AM

pedal2themetal said:
HI,
Is this cam going to be talkative ... have some kind of lope. Sound bite if you have one. OH its in my 1975 318..
OH I had to change to different springs . What came with it were almost an inch taller and wouldn't work , My machinist Didn't want to install them as he said he would have to machine the spring pockets like 60 thousands and was afraid he'd brake thru to the water jackets.. and that pressure might wipe out the cam..

COMP Cams Xtreme Energy Cam and Lifter Kits

Cam/Lifters/Valvetrain, Hydraulic Flat Tappet, Adv. Duration 262/270, Lift .462/.470, Mopar, 273-360, Kit

Did you CALL Comps TECH LINE & Inquire ?

PRHeads · Friday at 11:47 AM

Looking at the catalog, the XE262 cam for a SBM shows the recommended spring is a 901-16, which is very close to the stock 340 spring.

Should fit right on 318 heads that aren’t equipped with exhaust rotators.
And if they do have rotators, they should be replaced with std retainers along with swapping to 4 groove ex valves and locks.

toolmanmike · Friday at 11:58 AM

pedal2themetal said:
HI,
Is this cam going to be talkative ... have some kind of lope. Sound bite if you have one. OH its in my 1975 318..
OH I had to change to different springs . What came with it were almost an inch taller and wouldn't work , My machinist Didn't want to install them as he said he would have to machine the spring pockets like 60 thousands and was afraid he'd brake thru to the water jackets.. and that pressure might wipe out the cam..

COMP Cams Xtreme Energy Cam and Lifter Kits

Cam/Lifters/Valvetrain, Hydraulic Flat Tappet, Adv. Duration 262/270, Lift .462/.470, Mopar, 273-360, Kit

Which cam? Your link was a whole page on the sellers site with many different cams.

Never mind, I found it. XE262H-10

I would like to see the @.050 duration. 218/224 110° It will have a bit of a lope. Probably the biggest you should go on a 318 with stock compression. A Teen with 8/1 doesn't like much of a cam and this is borderline too big. What is the rest of your build? 4 barrel? Intake? What heads? Headers? Converter? Rear gears?
It might be a bit doggy on the bottom end because of the lack of compression.
The Extreme Energy cams have aggressive lobes and can be a bit noisy.

pedal2themetal · Friday at 2:40 PM

PRHeads said:
Looking at the catalog, the XE262 cam for a SBM shows the recommended spring is a 901-16, which is very close to the stock 340 spring.

Should fit right on 318 heads that aren’t equipped with exhaust rotators.
And if they do have rotators, they should be replaced with std retainers along with swapping to 4 groove ex valves and locks.

HI,
yes the 901-16 is what we reorder and installed what they shipped within the kit was 26942-16 Way to big for the 318.. no rotators on mine..

pedal2themetal · Friday at 2:47 PM

toolmanmike said:
Which cam? Your link was a whole page on the sellers site with many different cams.

Never mind, I found it. XE262H-10

I would like to see the @.050 duration. 218/224 110° It will have a bit of a lope. Probably the biggest you should go on a 318 with stock compression. A Teen with 8/1 doesn't like much of a cam and this is borderline too big. What is the rest of your build? 4 barrel? Intake? What heads? Headers? Converter? Rear gears?
It might be a bit doggy on the bottom end because of the lack of compression.
The Extreme Energy cams have aggressive lobes and can be a bit noisy.

HI,
yes 4bbl. QF 450 (I well increase that if I need to) ,Eldelbrock performer intake, Stock heads for a 75 had him take 10T off to bump the compression a little, stock manifolds 2 1/4 " duels out the back, stock converter, 308 rear gears.
Not looking for anything crazzy..

toolmanmike · Friday at 3:22 PM

pedal2themetal said:
HI,
yes 4bbl. QF 450 (I well increase that if I need to) ,Eldelbrock performer intake, Stock heads for a 75 had him take 10T off to bump the compression a little, stock manifolds 2 1/4 " duels out the back, stock converter, 308 rear gears.
Not looking for anything crazzy..

The Summit #6901 is quite popular with the 318 crowd. It works with a stock converter, 4 barrel and dual exhaust. #6900 or 6901 are both good ones.
Oregon cams is a good place to check out. Give them a call and tell them your combo and they can set you up.
That Comp cam you listed isn't too far from a 340 cam from back in the day which can be a bit too big, giving up some bottom end. The Summit 6901 is similar but it is ground on 114° which makes it milder with more bottom end and vacuum. (the Comp was a 110° which is a bit more radical. Here's a fun short of the 6901.

Here's a link to a few more videos. All 318's I believe. Some sound like they have more lope but initial timing and idle speed make a big difference there. That tan colored B body has a nice sound. https://www.youtube.com/results?search_query=summit+6901+cam+318

pedal2themetal · Friday at 5:24 PM

Sorry I didn't know the link was wrong I've changed the original link to the cam I have

Cam question Comp cam Extreme energy

pedal2themetal

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COMP Cams K20-222-3 COMP Cams Xtreme Energy Cam and Lifter Kits | Summit Racing

DanielSlocum

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496 polara

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pedal2themetal

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dodgeboy440

BOHNALITE CHRYSLER HEMI PROTOTYPE 1951

PRHeads

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toolmanmike

Henchman #2

pedal2themetal

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pedal2themetal

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toolmanmike

Henchman #2

pedal2themetal

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