I am replacing the cam in a 351c 4v with a
High Energy 268H Hydraulic Flat Tappet Camshaft & Lifter Kit
RPM Range: 1500-5500
Part Number # 249-CL32-221-3
How do I make sure my intake and carb match up andwork well with this type of cam.
post the parts and see who says what and why.Post your expectations
You cannot intelligently choose a camshaft for a motor without knowing the static compression ratio of the motor.
Taking a wild stab (not knowing anything about the motor) - a good dual plane intake and a 600 maybe a 650 cfm carb.
That cam is not suited for Cleveland 4-V heads. Not nearly enough duration to make it "work". The car will run MUCH better across the range with 2-V heads (that cam). Are they '70 ("quench") or '71-newer heads?
4-V heads are not really the hot lick for a street engine. We get much more "usable" power (in the operating range of a street engine) with 2-V heads, with large valves installed. No porting necessary, just a little "blending".
The strong point of the Cleveland 4-V is it's ability to rev. With only 218 @ .050" lift, RPM can't approach the sweet spot. BTW, it's better to list the "@.050" duration for a semi-accurate comparison to other cams.
Cleveland heads, not unlike BBC heads, "like" more lift than the average. With the 4-V heads, you should have a minimum of 230 @ .050" and .550" lift, to make the heads "work". You should also have at least 6 degrees more duration on the exhaust side. Clevelands are exhaust-impaired.
An open-plenum works very well for high-rev engines. For that cam, I agree, a dual plane (like Performer) is the better choice, but again, we're back to "which heads?".
IMO, Cleveland is far and away the best small block Ford for high-end performance. Apparently Robert Yates agrees... Built correctly, Cleveland is a GREAT engine.
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