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Max HP Cams, Boosted / Nitrous / Naturally Aspirated Hydraulic Roller Cams
Pontiac V8 Max HP Cams, Boosted / Nitrous / Naturally Aspirated Hydraulic Roller Cams
Cams for Boost, Bottles and Big N/A — Max HP Cams, Boosted / Nitrous / Naturally Aspirated Hydraulic Roller Cams for Pontiac V8s
Max HP is Butler's hydraulic roller lineup for engines making power a different way: a ProCharger or turbo on top, nitrous, or a big naturally aspirated combination that has outgrown the Hi-Torq grinds. A boosted engine does not want the same cam a N/A engine wants, and these are ground with that in mind.
Butler stocks eight Butler/Comp grinds here, split between power adder cams for ProCharger and turbo applications and N/A Stage 2 and Stage 3 cams. All are specified by duration at .050" and lobe lift, on lobe separations from 110 to 115.
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1. Power Adder Grinds
These are the ProCharger and turbo cams. Note the specification style: Butler quotes lobe lift here, not valve lift, so what you get at the valve depends on rocker ratio.
| Torque Storm and Stage 1 ProCharger | 236/244 at .050", .360"/.380" lobe lift, 114 lobe separation. The small blower grind, for a supercharged street car. |
| Stage 2 ProCharger | 259/267 at .050", .400"/.400" lobe lift, 115 lobe separation. Much more cam, on the widest separation in the group. |
| Stage 1 Turbo | 238/238 at .050", .360"/.360" lobe lift, 114 lobe separation. A single-pattern grind, intake and exhaust the same. |
| Stage 2 Turbo | 259/251 at .050", .400"/.400" lobe lift, 115 lobe separation. The exhaust side is shorter than the intake here, the opposite of how a naturally aspirated cam is usually split. |
The wide 114 and 115 lobe separations across the power adder group are the giveaway. Boost and overlap do not get along, and these grinds keep the charge in the cylinder rather than out the exhaust.
2. Naturally Aspirated Grinds
N/A here means naturally aspirated: a big-inch Pontiac making power on air and compression alone, past where the Hi-Torq Aggressive grinds run out.
| Stage 2 | 243/249 at .050", .399"/.399" lobe lift, ground on 112 or 114 lobe separation. The 114 version idles smoother and makes more vacuum; the 112 is choppier and gives more midrange. |
| Stage 3 | 253/259 at .050", .399"/.399" lobe lift, ground on 110 or 112. Same lobe lift as Stage 2 with substantially more duration, so the powerband moves up rather than the lift going up. |
3. What These Cams Assume
Nothing here is a step up from stock. Every grind belongs in an engine built around it.
| Installed centerline | Butler publishes the recommended intake lobe centerline for these: 110 lobe separation installs at 106, 112 at 108, 113 at 109, 114 at 110. Degree the cam rather than trusting the dots. |
| Valley pan and drive gear | a stock valley pan will not clear the tie bar on retrofit hydraulic roller lifters, and a roller core needs a bronze or polymer distributor gear. |
| Lifters and springs | these are listed as camshafts. Roller lifters and a spring package matched to the profile are a separate decision, and at these durations the spring choice is not a detail. |
Choosing between a power adder grind and an N/A grind is not a matter of which is bigger. If there is a blower, turbo or bottle in the plan, start on the power adder side and bring the boost level, the converter and the compression to the conversation.
Not sure what your Pontiac needs?
Call our tech team at 866-762-7527. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.