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Engines and Components› Camshafts and Valvetrain
COMP Cams
Marine 290/302 S-Roller Cam Ford 429,460
SKU: C007 34-803-9
Professional / shop required
Overview
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Part #: 34-803-9
Mechanical Roller-Pro stock style engine 500 or larger, Boss SVO or TFS heads.
Pro Stock style engine, 500c.i. or larger, Boss, SVO or TFS heads.
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Vehicle Symptoms
- Loses power above 6000 RPM on plane
- Flat top-end pull between 6000 and 8500 RPM
- Engine won't reach target 6000-8500 RPM range
- Boat lacks aggressive high-RPM exhaust note
- Old cam lobes show wear and top-end is weak
Relevant Conversations
- COMP Cams Xtreme Marine 34-803-9 specs for Ford 460
- Best high RPM camshaft for marine 429/460 big block
- 34-803-9 vs same stage marine roller cam for boats
- Ford 460 solid roller cam install guide marine
- What valve springs for COMP Cams 34-803-9?
- Boat loses top-end power above 6000 RPM cam upgrade
- 429/460 marine engine flat spot at 7000 RPM forum
- Will solid roller marine cam need new lifters and pushrods?
- COMP Cams 34-803-9 idle quality in a 460 ski boat
- P0300 misfire after camshaft upgrade marine engine
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | COMP Cams |
| Part Number | C007 34-803-9 |
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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
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