It isn't stock anymore so you can't assume you can set the timing the same as stock and expect it to run the same. The base engine was a time-tested 350cid 290 horsepower small block GM crate engine featuring a Weiand Air Strike intake manifold, 650cfm Holley carb, Hedman 1 -inch primary tube headers, Magnum mufflers with 18-inch collector extensions and an HEI distributor system. Likely need to richen the carb a little and increase the accel pump shot to make it snappy.Īt 14 degrees timing and the vacuum advance hooked up it probably either hesitates real bad on accel or even backfires through the carb on initial launch doesn't it? Specifications Camshaft Material: Valve Springs Required: Assembly Lubricant Included: Engine Family: Chevrolet 305-350 c.i. It will run great like that and won't hurt a thing. Just make sure it doesn't buck the starter when hot (it probably won't being low compression). You should just check the total timing using just the mechanical advance and set it about 38-40 degrees at 3000+ rpms and dont worry about initial. Specs for Big Mutha Thumper: Comp Cams 249-12-602-4 Exhaust Valve Lift (in.)0.486Intake Valve Lift (in.)0.500Int. Buddy stuck a mother thumper SBC cam in his boat 350 engine with ported. Thumpr Series camshafts is a line of cutting-edge hydraulic roller camshafts for engines originally equipped with flat tappet cams. If you want the big cam sound, pick a cam with a tight LSA but a lot less duration to keep the RPM HP peak below 5800 and overlap at or below 60. Big Mutha Thumpr 243/257 Hydraulic Roller Cam for OE Roller SBC 305-350 Big. You should just check the total timing using just the mechanical advance and set it about 38-40 degrees at 3000+ rpms and don't worry about initial. You say it is a stock bottom end and vortec heads and a thumper cam Idle vacuum is much different and plays havoc with the vacuum advance. As a daily driver this cam would suck big time. You say it is a stock bottom end and vortec heads and a thumper cam? Idle vacuum is much different and plays havoc with the vacuum advance. OLDSMOBILE 5. If so, (my opinion it probably is), then disconnect and plug the vacuum advance on the distributor and leave it plugged. Like has been said already, you need to know that the mark is at TDC first. So now, as Cole says, a Thumpr cam will let you have both the sound and the fury.
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