What are the duration specs at .050" for COMP Cams grind 31824133?

218 degrees intake and 224 degrees exhaust duration at .050" tappet lift.

What is the valve lift of this COMP cam?

Gross valve lift is .552" on both intake and exhaust, with lobe lift of .3250" on each lobe.

What lobe separation angle and installed intake centerline does the card specify?

Lobe separation is 113.0 degrees, and the specs are for the cam installed at a 110.0-degree intake centerline.

What engine is COMP Cams part 31824133 for?

The card lists the engine as CAMSHAFT, LS1 CHEVY / GEN III.

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COMP Cams 31824133 LS1 Chevy Gen III Cam Spec Card - 218/224 .552 Lift 113 LSA

COMP Cams spec card for LS1 Chevy camshaft 31824133 with lift, duration, timing

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COMP Cams camshaft specification card listing valve lift, duration, lobe separation, and timing for an LS1 Gen III camshaft.

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This document is a COMP Cams camshaft specification card for a camshaft fitting the LS1 Chevy / Gen III engine, part number 31824133 (grind number 31824133, serial number 080409-17). It lists the full valve event specifications: hydraulic (HYD) valve adjustment on both intake and exhaust, gross valve lift of .552" on both intake and exhaust, and advertised duration at .006" tappet lift of 269 degrees intake and 276 degrees exhaust. Valve timing at .050" tappet lift is: intake opens 1 degree after TDC (shown as 1- BTDC) and closes 39 degrees ABDC; exhaust opens 48 degrees BBDC and closes 4 degrees before TDC (shown as 4- ATDC). Duration at .050" is 218 degrees intake and 224 degrees exhaust, with lobe lift of .3250" on both lobes and a lobe separation angle of 113.0 degrees. The card notes these specs apply with the cam installed at a 110.0-degree intake centerline. This is the reference card typically included in the cam box, used when degreeing the camshaft during installation and for verifying the grind matches the order.

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Frequently asked questions

What are the duration specs at .050" for COMP Cams grind 31824133?: 218 degrees intake and 224 degrees exhaust duration at .050" tappet lift.
What is the valve lift of this COMP cam?: Gross valve lift is .552" on both intake and exhaust, with lobe lift of .3250" on each lobe.
What lobe separation angle and installed intake centerline does the card specify?: Lobe separation is 113.0 degrees, and the specs are for the cam installed at a 110.0-degree intake centerline.
What engine is COMP Cams part 31824133 for?: The card lists the engine as CAMSHAFT, LS1 CHEVY / GEN III.
What are the valve opening and closing events at .050"?: Intake: opens 1 degree (shown as 1- BTDC) and closes 39 degrees ABDC. Exhaust: opens 48 degrees BBDC and closes 4 degrees (shown as 4- ATDC).