Can anyone identify this cam !! COMP 3720R/3732R
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Per Comp's "Master Lobe Catalog":
XTREME ENERGY™ XE-R FOR LS1
The XE-R designs are the most aggressive COMP Cams® hydraulic roller ramps to date. They are quicker off and on the seat than the original Xtreme Energy™ Series, yet they are still stable with rigid valve train and optimized spring selection. These profiles provide even more area than the comparable Small Block Chevrolet designs that are often used by other companies to "grow" a more aggressive lobe for LS1 applications.
CAMSHAFT TYPE LOBE # RATED
DURATION
DURATION IN DEGREES LOBE LIFT TAPPET LIFT @ TDC THEORETICAL VALVE LIFT @ "0" LASH
ROCKER ARM RATIO
@ .050 @ .200 106° 110° 1.5 1.6 1.7
XE-R for LS1
Rated Duration @
.006" Tappet Lift
LS1 55mm Journal
Journal = B,F,R,Q…
MI 25.9 (12.7/13.2)
3720 269 220 143 .342 .062 .049 .513 .547 .581
3721 271 222 144 .342 .065 .052 .513 .547 .581
3722 273 224 146 .342 .069 .055 .513 .547 .581
3723 275 226 147 .344 .073 .059 .516 .550 .585
3724 277 228 149 .346 .076 .062 .519 .554 .588
Kinda a mess since it's a copypasta of a table in a pdf, butt you can see the 3720 & 3723 lobes in there. The columns of data are: the lobe numbers; durations at .006", .050", and .200"; max lobe lift; tappet lifts at TDC when the lobe center is at 106° and 110°; and theoretical valve lifts with 1.5, 1.6, & 1.7 rocker ratios. "3732" in your post is almost certainly a typo, since a 3732 exhaust lobe, which is in the same series, has durations of 293°/244° which would be wildly mismatched to a 269°/220° intake lobe. Yours is ground on 116° LSA and 0° installed ICL timing (110° BTDC if I'm not mistaken). It's a custom grind using standard lobes. Compare for example to the 426 grind (54-426-11) off-the-shelf cam which uses the 3723 & 3724 lobes, or 54-444-11 which has 3723 & 3725 lobes. Yours is probably intended for square-port heads.
XTREME ENERGY™ XE-R FOR LS1
The XE-R designs are the most aggressive COMP Cams® hydraulic roller ramps to date. They are quicker off and on the seat than the original Xtreme Energy™ Series, yet they are still stable with rigid valve train and optimized spring selection. These profiles provide even more area than the comparable Small Block Chevrolet designs that are often used by other companies to "grow" a more aggressive lobe for LS1 applications.
CAMSHAFT TYPE LOBE # RATED
DURATION
DURATION IN DEGREES LOBE LIFT TAPPET LIFT @ TDC THEORETICAL VALVE LIFT @ "0" LASH
ROCKER ARM RATIO
@ .050 @ .200 106° 110° 1.5 1.6 1.7
XE-R for LS1
Rated Duration @
.006" Tappet Lift
LS1 55mm Journal
Journal = B,F,R,Q…
MI 25.9 (12.7/13.2)
3720 269 220 143 .342 .062 .049 .513 .547 .581
3721 271 222 144 .342 .065 .052 .513 .547 .581
3722 273 224 146 .342 .069 .055 .513 .547 .581
3723 275 226 147 .344 .073 .059 .516 .550 .585
3724 277 228 149 .346 .076 .062 .519 .554 .588
Kinda a mess since it's a copypasta of a table in a pdf, butt you can see the 3720 & 3723 lobes in there. The columns of data are: the lobe numbers; durations at .006", .050", and .200"; max lobe lift; tappet lifts at TDC when the lobe center is at 106° and 110°; and theoretical valve lifts with 1.5, 1.6, & 1.7 rocker ratios. "3732" in your post is almost certainly a typo, since a 3732 exhaust lobe, which is in the same series, has durations of 293°/244° which would be wildly mismatched to a 269°/220° intake lobe. Yours is ground on 116° LSA and 0° installed ICL timing (110° BTDC if I'm not mistaken). It's a custom grind using standard lobes. Compare for example to the 426 grind (54-426-11) off-the-shelf cam which uses the 3723 & 3724 lobes, or 54-444-11 which has 3723 & 3725 lobes. Yours is probably intended for square-port heads.
Last edited by RB04Av; Apr 25, 2026 at 11:27 AM.
Thread Starter
Teching In
Joined: Jun 2010
Posts: 31
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Per Comp's "Master Lobe Catalog":
XTREME ENERGY™ XE-R FOR LS1
The XE-R designs are the most aggressive COMP Cams® hydraulic roller ramps to date. They are quicker off and on the seat than the original Xtreme Energy™ Series, yet they are still stable with rigid valve train and optimized spring selection. These profiles provide even more area than the comparable Small Block Chevrolet designs that are often used by other companies to "grow" a more aggressive lobe for LS1 applications.
CAMSHAFT TYPE LOBE # RATED
DURATION
DURATION IN DEGREES LOBE LIFT TAPPET LIFT @ TDC THEORETICAL VALVE LIFT @ "0" LASH
ROCKER ARM RATIO
@ .050 @ .200 106° 110° 1.5 1.6 1.7
XE-R for LS1
Rated Duration @
.006" Tappet Lift
LS1 55mm Journal
Journal = B,F,R,Q…
MI 25.9 (12.7/13.2)
3720 269 220 143 .342 .062 .049 .513 .547 .581
3721 271 222 144 .342 .065 .052 .513 .547 .581
3722 273 224 146 .342 .069 .055 .513 .547 .581
3723 275 226 147 .344 .073 .059 .516 .550 .585
3724 277 228 149 .346 .076 .062 .519 .554 .588
Kinda a mess since it's a copypasta of a table in a pdf, butt you can see the 3720 & 3723 lobes in there. The columns of data are: the lobe numbers; durations at .006", .050", and .200"; max lobe lift; tappet lifts at TDC when the lobe center is at 106° and 110°; and theoretical valve lifts with 1.5, 1.6, & 1.7 rocker ratios. "3732" in your post is almost certainly a typo, since a 3732 exhaust lobe, which is in the same series, has durations of 293°/244° which would be wildly mismatched to a 269°/220° intake lobe. Yours is ground on 116° LSA and 0° installed ICL timing (110° BTDC if I'm not mistaken). It's a custom grind using standard lobes. Compare for example to the 426 grind (54-426-11) off-the-shelf cam which uses the 3723 & 3724 lobes, or 54-444-11 which has 3723 & 3725 lobes. Yours is probably intended for square-port heads.
XTREME ENERGY™ XE-R FOR LS1
The XE-R designs are the most aggressive COMP Cams® hydraulic roller ramps to date. They are quicker off and on the seat than the original Xtreme Energy™ Series, yet they are still stable with rigid valve train and optimized spring selection. These profiles provide even more area than the comparable Small Block Chevrolet designs that are often used by other companies to "grow" a more aggressive lobe for LS1 applications.
CAMSHAFT TYPE LOBE # RATED
DURATION
DURATION IN DEGREES LOBE LIFT TAPPET LIFT @ TDC THEORETICAL VALVE LIFT @ "0" LASH
ROCKER ARM RATIO
@ .050 @ .200 106° 110° 1.5 1.6 1.7
XE-R for LS1
Rated Duration @
.006" Tappet Lift
LS1 55mm Journal
Journal = B,F,R,Q…
MI 25.9 (12.7/13.2)
3720 269 220 143 .342 .062 .049 .513 .547 .581
3721 271 222 144 .342 .065 .052 .513 .547 .581
3722 273 224 146 .342 .069 .055 .513 .547 .581
3723 275 226 147 .344 .073 .059 .516 .550 .585
3724 277 228 149 .346 .076 .062 .519 .554 .588
Kinda a mess since it's a copypasta of a table in a pdf, butt you can see the 3720 & 3723 lobes in there. The columns of data are: the lobe numbers; durations at .006", .050", and .200"; max lobe lift; tappet lifts at TDC when the lobe center is at 106° and 110°; and theoretical valve lifts with 1.5, 1.6, & 1.7 rocker ratios. "3732" in your post is almost certainly a typo, since a 3732 exhaust lobe, which is in the same series, has durations of 293°/244° which would be wildly mismatched to a 269°/220° intake lobe. Yours is ground on 116° LSA and 0° installed ICL timing (110° BTDC if I'm not mistaken). It's a custom grind using standard lobes. Compare for example to the 426 grind (54-426-11) off-the-shelf cam which uses the 3723 & 3724 lobes, or 54-444-11 which has 3723 & 3725 lobes. Yours is probably intended for square-port heads.
pic of the cam
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Joined: Dec 2017
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Wow.
3732 is on the next page of the lobe catalog (the same table split across 2 pages) so I didn't go quite that far in my direct copy/paste, butt I did give you the duration #s for it. That combo of lobes gives a 24° split between intake and exhaust. It's essentially a mild almost-stock-tuning-compatible intake lobe, and a full-on race exh one. A "wide" split would be 10 - 12°. I can't imagine what somebody was thinking when they spec'd that. Maybe a 300 wet shot on top of a street motor? It would be excessive even for that.
The first number is probably the work or sales order it was produced under. Maybe a call to Comp might give you some insight into what it was bought for, who spec'd it, etc.
I don't think I'd run that in anything I was ever building however.
How did you acquire this? What would you be using it for, if anything?
3732 is on the next page of the lobe catalog (the same table split across 2 pages) so I didn't go quite that far in my direct copy/paste, butt I did give you the duration #s for it. That combo of lobes gives a 24° split between intake and exhaust. It's essentially a mild almost-stock-tuning-compatible intake lobe, and a full-on race exh one. A "wide" split would be 10 - 12°. I can't imagine what somebody was thinking when they spec'd that. Maybe a 300 wet shot on top of a street motor? It would be excessive even for that.
The first number is probably the work or sales order it was produced under. Maybe a call to Comp might give you some insight into what it was bought for, who spec'd it, etc.
I don't think I'd run that in anything I was ever building however.
How did you acquire this? What would you be using it for, if anything?
Thread Starter
Teching In
Joined: Jun 2010
Posts: 31
Likes: 0
Wow.
3732 is on the next page of the lobe catalog (the same table split across 2 pages) so I didn't go quite that far in my direct copy/paste, butt I did give you the duration #s for it. That combo of lobes gives a 24° split between intake and exhaust. It's essentially a mild almost-stock-tuning-compatible intake lobe, and a full-on race exh one. A "wide" split would be 10 - 12°. I can't imagine what somebody was thinking when they spec'd that. Maybe a 300 wet shot on top of a street motor? It would be excessive even for that.
The first number is probably the work or sales order it was produced under. Maybe a call to Comp might give you some insight into what it was bought for, who spec'd it, etc.
I don't think I'd run that in anything I was ever building however.
How did you acquire this? What would you be using it for, if anything?
3732 is on the next page of the lobe catalog (the same table split across 2 pages) so I didn't go quite that far in my direct copy/paste, butt I did give you the duration #s for it. That combo of lobes gives a 24° split between intake and exhaust. It's essentially a mild almost-stock-tuning-compatible intake lobe, and a full-on race exh one. A "wide" split would be 10 - 12°. I can't imagine what somebody was thinking when they spec'd that. Maybe a 300 wet shot on top of a street motor? It would be excessive even for that.
The first number is probably the work or sales order it was produced under. Maybe a call to Comp might give you some insight into what it was bought for, who spec'd it, etc.
I don't think I'd run that in anything I was ever building however.
How did you acquire this? What would you be using it for, if anything?
My buddy just purchased a C6 Z06 and it came with two spare cams. I was looking to run it in my CTSV but i think im going to go with the BTR LS1 STAGE 2 V2 . The comp cam he has looks like a odd cam LOL
