LT4 Available Pulley Combos and Supporting Mods Needed

Posted by Ben Herndon on

Here is a spreadsheet to reference when you're planning/modding to help you figure out what you need at what levels.  Granted all of this depends on a wide variety of things from plans of use for the car like street, strip, and/or track to where you are, ie temps, atmosphere, climate changes etc.  Less air restriction such as free flowing intake, headers, exhaust, porting etc all drastically help reduce heat by increasing the ease of the blower and airflow in and out of the engine.  Your cam profile will also affect the air movement!  

Keep in mind, preventative heat mods such as heat exchangers, tanks, pumps etc can't be done too early really.  Stock C7 Z06s, ZL1s, and CTS V's pull timing on pull 2 and pull 3 on the dyno due to increased heat.  Even stock LT4 powered vehicles can benefit from some of these mods, but they really become a necessity as you push the blower.  Even as you add more blower RPM, you have to add other parts to reduce restrictions and protect your motor.  So, feel free to get a hold of us and we'll help point you in the right direction for your planned end game.  



For packages with the below combinations, use the search box in the top right corner and type in your vehicle, engine, and the type of kit you're after like pulley kit or fuel kit and see what we've put together!  Our Griptech pulleys offer unparalleled performance. 

You can see the effective blower ratio in the 1st column, the % of increase over stock in the 2nd column, the RPM of the blower vs. the engine RPM in the 3rd column, the upper pulley choice in the 4th, lower pulley in the 5th, the car model as not all are available, whether the snout needs milled to clear the smaller upper pulley in column 6, whether the cats need omitted in column 7, and the estimated boost with proper mods in column 8.  

Scrolling down to the next section, columns 1-3 are repeated, column 4 shows if the factory fuel system can support this on pump gas (not E85), if a higher octane is needed in column 5, if you need to do one of our heat exchanger upgrades in column 6, heat exchanger pump upgrade in column 7, and lastly a heat exchanger tank in column 8.  

Questions or to put in a custom order, call 513-662-4000 or email sales@weapon-x.com

Blower Ratio % Increase Blower RPM at 6,700 RPM WEAPON-X GriptecBlower Pulley Crank Pulley Car Model Snout Milling Cats
Stock 3.20 0.00% 21,440 2.50 8.00 C7Z, V3, ZL1 No OEM
3.44 7.50% 23,048 2.50 8.60 C7Z, V3, ZL2 No OEM
3.64 13.75% 24,388 2.50 9.10 C7Z, V3, ZL3 No 2" Headers
3.68 15.00% 24,656 2.50 9.20 C7Z, V3, ZL4 No 2" Headers
3.78 18.00% 25,299 2.50 9.44 C7Z, V3, ZL5 No 2" Headers
3.80 18.75% 25,460 2.50 9.50 V3, ZL1 No 2" Headers
4.00 25.00% 26,800 2.50 10.00 V3, ZL2 No 2" Headers
4.20 31.25% 28,140 2.50 10.50 V3, ZL3 No 2" Headers
3.33 4.17% 22,333 2.40 8.00 C7Z, V3, ZL1 No OEM
3.58 11.98% 24,008 2.40 8.60 C7Z, V3, ZL2 No 2" Headers
3.79 18.49% 25,404 2.40 9.10 C7Z, V3, ZL3 No 2" Headers
3.83 19.79% 25,683 2.40 9.20 C7Z, V3, ZL4 No 2" Headers
3.93 22.92% 26,353 2.40 9.44 C7Z, V3, ZL5 No 2" Headers
3.96 23.70% 26,521 2.40 9.50 V3, ZL1 No 2" Headers
4.17 30.21% 27,917 2.40 10.00 V3, ZL2 No 2" Headers
4.38 36.72% 29,313 2.40 10.50 V3, ZL3 No 2" Headers
3.48 8.70% 23,304 2.30 8.00 C7Z, V3, ZL1 No OEM
3.74 16.85% 25,052 2.30 8.60 C7Z, V3, ZL2 No 2" Headers
3.96 23.64% 26,509 2.30 9.10 C7Z, V3, ZL3 No 2" Headers
4.00 25.00% 26,800 2.30 9.20 C7Z, V3, ZL4 No 2" Headers
4.10 28.26% 27,499 2.30 9.44 C7Z, V3, ZL5 No 2" Headers
4.15 29.76% 27,820 2.30 9.55 V3, ZL1 No 2" Headers
4.35 35.87% 29,130 2.30 10.00 V3, ZL2 No 2" Headers
4.57 42.66% 30,587 2.30 10.50 V3, ZL3 No 2" Headers
3.56 11.11% 23,822 2.25 8.00 C7Z, V3, ZL1 Yes 2" Headers
3.82 19.44% 25,609 2.25 8.60 C7Z, V3, ZL2 Yes 2" Headers
4.04 26.39% 27,098 2.25 9.10 C7Z, V3, ZL3 Yes 2" Headers
4.09 27.78% 27,396 2.25 9.20 C7Z, V3, ZL4 Yes 2" Headers
4.20 31.11% 28,110 2.25 9.44 C7Z, V3, ZL5 Yes 2" Headers
4.22 31.94% 28,289 2.25 9.50 V3, ZL1 Yes 2" Headers
4.44 38.89% 29,778 2.25 10.00 V3, ZL2 Yes 2" Headers
4.67 45.83% 31,267 2.25 10.50 V3, ZL3 Yes 2" Headers
3.64 13.64% 24,364 2.20 8.00 C7Z, V3, ZL1 Yes 2" Headers
3.91 22.16% 26,191 2.20 8.60 C7Z, V3, ZL2 Yes 2" Headers
4.14 29.26% 27,714 2.20 9.10 C7Z, V3, ZL3 Yes 2" Headers
4.18 30.68% 28,018 2.20 9.20 C7Z, V3, ZL4 Yes 2" Headers
4.29 34.09% 28,749 2.20 9.44 C7Z, V3, ZL5 Yes 2" Headers
4.34 35.65% 29,084 2.20 9.55 V3, ZL1 Yes 2" Headers
4.55 42.05% 30,455 2.20 10.00 V3, ZL2 Yes 2" Headers
4.77 49.15% 31,977 2.20 10.50 V3, ZL3 Yes 2" Headers
3.68 14.94% 24,644 2.175 8.00 C7Z, V3, ZL1 Yes 2" Headers
3.95 23.56% 26,492 2.175 8.60 C7Z, V3, ZL2 Yes 2" Headers
4.18 30.75% 28,032 2.175 9.10 C7Z, V3, ZL3 Yes 2" Headers
4.23 32.18% 28,340 2.175 9.20 C7Z, V3, ZL4 Yes 2" Headers
4.34 35.63% 29,080 2.175 9.44 C7Z, V3, ZL5 Yes 2" Headers
4.37 36.49% 29,264 2.175 9.50 V3, ZL1 Yes 2" Headers
4.60 43.68% 30,805 2.175 10.00 V3, ZL2 Yes 2" Headers
4.83 50.86% 32,345 2.175 10.50 V3, ZL3 Yes 2" Headers
Blower Ratio % Increase Blower RPM at 6,700 RPM Fuel Needed Octane Needed WEAPON-X Heat Exchanger High Flow Pump HX Tank
Stock 3.20 0.00% 21,440 OEM No OEM OEM No
3.44 7.50% 23,048 OEM No OEM OEM No
3.64 13.75% 24,388 OEM No Yes OEM No
3.68 15.00% 24,656 OEM No Yes OEM Yes
3.78 18.00% 25,299 OEM Yes Yes Yes Yes
3.80 18.75% 25,460 OEM Yes Yes Yes Yes
4.00 25.00% 26,800 Yes Yes Yes Yes Yes
4.20 31.25% 28,140 Yes No Yes Yes Yes
3.33 4.17% 22,333 OEM No OEM OEM No
3.58 11.98% 24,008 OEM No Yes OEM No
3.79 18.49% 25,404 Yes Yes Yes Yes Yes
3.83 19.79% 25,683 Yes Yes Yes Yes Yes
3.93 22.92% 26,353 Yes Yes Yes Yes Yes
3.96 23.70% 26,521 Yes Yes Yes Yes Yes
4.17 30.21% 27,917 Yes Yes Yes Yes Yes
4.38 36.72% 29,313 Yes Yes Yes Yes Yes
3.48 8.70% 23,304 OEM No Yes OEM No
3.74 16.85% 25,052 OEM No Yes OEM Yes
3.96 23.64% 26,509 Yes Yes Yes Yes Yes
4.00 25.00% 26,800 Yes Yes Yes Yes Yes
4.10 28.26% 27,499 Yes Yes Yes Yes Yes
4.15 29.76% 27,820 Yes Yes Yes Yes Yes
4.35 35.87% 29,130 Yes Yes Yes Yes Yes
4.57 42.66% 30,587 Yes Yes Yes Yes Yes
3.56 11.11% 23,822 OEM No Yes OEM No
3.82 19.44% 25,609 OEM Yes Yes Yes Yes
4.04 26.39% 27,098 Yes Yes Yes Yes Yes
4.09 27.78% 27,396 Yes Yes Yes Yes Yes
4.20 31.11% 28,110 Yes Yes Yes No No
4.22 31.94% 28,289 Yes Yes Yes Yes Yes
4.44 38.89% 29,778 Yes Yes Yes Yes Yes
4.67 45.83% 31,267 Yes Yes Yes Yes Yes
3.64 13.64% 24,364 OEM No Yes OEM No
3.91 22.16% 26,191 Yes Yes Yes Yes Yes
4.14 29.26% 27,714 Yes Yes Yes Yes Yes
4.18 30.68% 28,018 Yes Yes Yes Yes Yes
4.29 34.09% 28,749 Yes Yes Yes Yes Yes
4.34 35.65% 29,084 Yes Yes Yes Yes Yes
4.55 42.05% 30,455 Yes Yes Yes Yes Yes
4.77 49.15% 31,977 Yes Yes Yes Yes Yes
3.68 14.94% 24,644 OEM No Yes OEM Yes
3.95 23.56% 26,492 Yes Yes Yes Yes Yes
4.18 30.75% 28,032 Yes Yes Yes Yes Yes
4.23 32.18% 28,340 Yes Yes Yes Yes Yes
4.34 35.63% 29,080 Yes Yes Yes Yes Yes
4.37 36.49% 29,264 Yes Yes Yes Yes Yes
4.60 43.68% 30,805 Yes Yes Yes Yes Yes
4.83 50.86% 32,345 Yes Yes Yes Yes Yes

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