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10-23-2020, 06:26 PM | #1 |
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L-100 cam in a 221
I've been forced to rethink the motor I've been building and will start over with a 36LB block with maybe .030 overbore and stock stroke. I'll be using stock 36 aluminum heads. I plan to optimize the CR with .040 piston to head clearance and milling the heads. I have a Fenton 2 carb manifold and 2 Holley 94s. I also have an L-100 cam.
I've had other engines with a lot of cam and not a lot of compression, revving something to make it work is not a new experience, I don't need a torque monster to have fun. This is going into a 36 pickup with 3.78 gears and a stock 39 trans, just for occasional local fun. Will this cam work OK in a 221? Would porting the block be important in this combination? |
10-23-2020, 06:33 PM | #2 |
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Re: L-100 cam in a 221
I've probably built more engines than anyone else with the L-100, it was the goto cam. However they didn't run well in a small engine especially in a heavy vehicle . But they do sound good. Why not the 1007b, sounds good and would probably run better.
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10-23-2020, 06:47 PM | #3 |
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Re: L-100 cam in a 221
Yoyo, I've built and run numerous 221's, including the L100 and Fenton twin as you're proposing. I agree with Ron; the L100 is not a good cam in this application. Try an Isky 88 cam along with your other mods, take the lip off the flywheel, use a 9" clutch, and yes, port the block. The idea is to lighten everything as much as possible and allow the thing to breathe. Enjoy...
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10-23-2020, 07:20 PM | #4 |
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Re: L-100 cam in a 221
This would be my choice in cams . . . but there are plenty of ways to "skin this cat".
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10-23-2020, 07:55 PM | #5 |
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Re: L-100 cam in a 221
Thanks for the knowledgeable recommendations! A quick search shows isky cams only for 42-up, would I have to give up the 3 bolt distributor and front plate?
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10-23-2020, 08:12 PM | #6 |
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Re: L-100 cam in a 221
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10-23-2020, 09:48 PM | #7 |
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Re: L-100 cam in a 221
The L 100 need compression and cubs to build the torque lost to a long cam. Thus you have a streetable cay. The 276 does this.
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10-24-2020, 07:29 AM | #8 | |
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Re: L-100 cam in a 221
Quote:
Truth be told, I'd rather have a stock cam reground these days than buy a "new" one. But hey, that is just me . . . |
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10-24-2020, 04:29 PM | #9 |
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Re: L-100 cam in a 221
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10-24-2020, 04:48 PM | #10 |
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Re: L-100 cam in a 221
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10-24-2020, 05:19 PM | #11 |
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Re: L-100 cam in a 221
I always use a steel camshaft out of an early engine...
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10-24-2020, 05:47 PM | #12 |
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Re: L-100 cam in a 221
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10-24-2020, 07:10 PM | #13 |
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Re: L-100 cam in a 221
Since Pete is here, what is the acceptable smallest diameter for cam journals to reuse? I checked the 3 I have, they range between 1.7955/1.797.
What do (or should) installed cam bearings measure? |
10-24-2020, 07:40 PM | #14 |
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Re: L-100 cam in a 221
Cam journals measure between 1.796-1.797". Wear limit is 1.795" Clearance in brgs is .002"
this is what i do; Install .010" undersize cam bearings. Measure the installed dia of each bearing. As a reground cam is ground between centres, I put the camshaft between the same centres and grind the journals to suit the installed bearings. Do not assume that .010" bearings, when installed will measure exactly .010 u/s! Doing it this way ensures perfect concentricity of the camshaft journals and lobes, also, I am assured the correct clearances are in place, with no resultant loss of oil pressure through sloppy clearances.
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10-24-2020, 08:18 PM | #15 |
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Re: L-100 cam in a 221
Where do you get under size cam bearings.??
Gramps |
10-24-2020, 08:39 PM | #16 |
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Re: L-100 cam in a 221
They are out there....
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10-24-2020, 08:48 PM | #17 | |
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Re: L-100 cam in a 221
Quote:
I use 1.795 as a minimum as long as it is round. |
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10-24-2020, 08:53 PM | #18 |
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Re: L-100 cam in a 221
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10-25-2020, 12:17 AM | #19 | |
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Re: L-100 cam in a 221
Most of the new parts sellers have them, they are currently made. I have a set I don't need now. Quote:
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