Do COMP Cams Thumpr NSR 3V cams require a valve spring upgrade?

No. The document states no valve spring upgrade is required, and all three grinds are compatible with stock valve springs.

What are the part numbers for the Thumpr NSR Ford 3V cam sets?

Thumpr is 127010 (grind TH265LL), Mutha' Thumpr is 127020 (MT273LL), and Big Mutha' Thumpr is 127030 (BT281LL). Each part number includes right and left camshafts.

How much horsepower do the Thumpr NSR cams add?

Testing confirmed repeatable gains of 25+ rear wheel horsepower in stock configuration, with even more possible with headers, air intake and tuning.

What are the specs of the Big Mutha' Thumpr cam?

PN 127030, grind BT281LL: 750-6800 RPM operating range, 281/314 advertised duration, 242/262 duration @ .050", .450/.450 valve lift, 109° lobe separation. It has an extremely rough idle and needs a stroker motor and/or ported heads; best with 3.73+ gears and a 2500 stall.

Home/ Registry/ Ford/ Crown Victoria/ 1998-2011/ “Jade”/ Photo supermotors.net/registry/media/685592

COMP Cams Thumpr NSR Ford 4.6L/5.4L 3V Camshaft Specs - 127010, 127020, 127030

COMP Cams new-products poster for Thumpr NSR Ford modular cams

COMP Cams product literature poster for Thumpr NSR 4.6L/5.4L modular cams with a cam spec table.

AI caption November 2008 · Photo 0 of 5000

This is a photographed COMP Cams 'New Products' trade-show/display poster announcing the Thumpr NSR camshaft line for Ford 4.6L/5.4L Modular 3-Valve engines. The document explains that these cam sets require no valve spring upgrade and deliver an aggressive 'thumping' exhaust idle with power gains in the middle and upper RPM range on naturally aspirated or blower-equipped Ford 3-valve engines. Installation requires only the COMP Cams Cam Phaser Limiter Kit (#5449) and computer tuning; the kit modifies the factory variable cam timing (VCT) system so aggressive lobe profiles can be used without losing VCT benefits. Testing confirmed repeatable gains of 25+ rear-wheel horsepower with no durability sacrifices. A specification table lists three grinds: Thumpr (PN 127010, grind TH265LL, 750-6400 RPM, duration 265/298 adv., 226/246 @ .050"), Mutha' Thumpr (PN 127020, MT273LL, 750-6600 RPM, 273/306 adv., 234/254 @ .050"), and Big Mutha' Thumpr (PN 127030, BT281LL, 750-6800 RPM, 281/314 adv., 242/262 @ .050"). All have hydraulic valve settings, .450/.450 valve lift, and 109° lobe separation angle. A footnote states each part number includes right and left camshafts.

Is this accurate? Sign in to help verify it.

Frequently asked questions

Do COMP Cams Thumpr NSR 3V cams require a valve spring upgrade?: No. The document states no valve spring upgrade is required, and all three grinds are compatible with stock valve springs.
What is required to install Thumpr NSR cams on a Ford 4.6L/5.4L 3V engine?: Only the addition of the COMP Cams Cam Phaser Limiter Kit (#5449) and computer tuning; the kit modifies the factory variable cam timing (VCT) system.
What are the part numbers for the Thumpr NSR Ford 3V cam sets?: Thumpr is 127010 (grind TH265LL), Mutha' Thumpr is 127020 (MT273LL), and Big Mutha' Thumpr is 127030 (BT281LL). Each part number includes right and left camshafts.
How much horsepower do the Thumpr NSR cams add?: Testing confirmed repeatable gains of 25+ rear wheel horsepower in stock configuration, with even more possible with headers, air intake and tuning.
What are the specs of the Big Mutha' Thumpr cam?: PN 127030, grind BT281LL: 750-6800 RPM operating range, 281/314 advertised duration, 242/262 duration @ .050", .450/.450 valve lift, 109° lobe separation. It has an extremely rough idle and needs a stroker motor and/or ported heads; best with 3.73+ gears and a 2500 stall.