Camshaft for blown 360

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Colton Baker

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I'm planning on building a 360/408 stroker for my 74 Plymouth Scamp and my plan is to put a 4-71 blower on top. Anyone have any recommendations on camshafts to use in this application? The stroker kit I found is the Scat 1-98113BI kit on CNC Motorsports if that helps.
Thanks!
 
The CR might be a little high with that kit as the pistons they use are -20.5cc.

Can they swap (substitute) them to the Icon IC982 pistons? These are -34cc
 
What gears, transmission, cylinder heads, rear tires, how much boost are you planning on, and what's the intended usage?
 
Garrett Ellison said:
What gears, transmission, cylinder heads, rear tires, how much boost are you planning on, and what's the intended usage?
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4.11 limited, probably about to go 4.56, 727 trans, 340 heads, I don't know what size tire I'm running off the top of my head and I'm looking for probably 12 pounds of boost. And just a street strip car
 
I would think negative anything piston volume would be too much. A negative piston volume ADDS TO the piston volume which TAKES AWAY from the over all chamber volume and ADDS compression. Sometimes people get that reversed.

That said, I would run something with a 112 or 114 lobe separation. Beyond that, I would choose an appropriate lift that matched the rest of the build. As in matches your rocker arms and whatever shafts you're running and whatever RPM range you plan to run in "mostly". If this is a street cruiser, "I" would choose something no more than .550 lift with .050" duration from 220-250 but ground on a 112 or 114 LSA.
 
in the words of Richard Holdener "All cams are turbo cams"... meaning the cam that works properly NA will work just as well boosted.. Once you start getting into absolutely crazy setups or numbers then you MIGHT see a difference, MAYBE.
Holdener has some good videos and comparisons.
 
They let note too Holdener’s quote is “Turbo”. When you blow intake charge out the exhaust it usually burns at the turbo and helps it spool up quicker. In the case of crankshaft driven boost, it’s just wasted fuel and air charge blowing out of the exhaust. Split pattern cams are fine (actually optimum) with roots boost, but the wider the split, the wider the LSA should be. What type of cam, Flat tappet or roller, hydraulic or solid?
 
Yeah, come to think of it, a 4-71is a little small in general for a 408. Do you already have the blower setup?
 
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Call Crower, Isky or/and Lunati. Lot of super charger experience there. Bullet/Crane as well.
 
Garrett Ellison said:
They let note too Holdener’s quote is “Turbo”. When you blow intake charge out the exhaust it usually burns at the turbo and helps it spool up quicker. In the case of crankshaft driven boost, it’s just wasted fuel and air charge blowing out of the exhaust. Split pattern cams are fine (actually optimum) with roots boost, but the wider the split, the wider the LSA should be. What type of cam, Flat tappet or roller, hydraulic or solid?
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If you watch the video, its a blower. He brings up that scenario. But the dyno doesn't reproduce the loss of power people think it will. Its fun to watch his videos as he does alot of comparisons, some things are proven some not.
 
Colton Baker said:
I'm planning on building a 360/408 stroker for my 74 Plymouth Scamp and my plan is to put a 4-71 blower on top. Anyone have any recommendations on camshafts to use in this application? The stroker kit I found is the Scat 1-98113BI kit on CNC Motorsports if that helps.
Thanks!
Click to expand...
9.5:1, cam around 230-240@.050 on a 110lca...
 
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