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Even though these heads have different size ports, they flow almost the same on the intake and exhaust side.
The intake port on the 351N measures 194 cc's while the 352N intake port is 185 cc's. The exhaust port on the 351N is noticeably larger than the 352N.
In stock form the intake ports flow 236 to 245 cfm and the exhaust will flow 162 to 175 cfm when flow tested without a header. With our “UnderCover Porting” the intake will flow 255 to 269 cfm and the exhaust will improve to 180 to 185 cfm.
All complete 351N or 352N heads have APR rocker studs, Manley guide plates, hardened spring locators, Isky springs, CV Products chrome moly retainers & locks. The castings are pressure tested and a flow bench developed Serdi valve job specifically for the “N” style heads is performed.
See full details about our complete head assemblies. Check out a list of options for our complete heads.
| Part # |
Description |
Price |
| LMS-351N-UC |
Complete 351N heads with "UnderCover Porting", Isky 8005 springs, 6000 series Ferrea valves & flat surfaced. |
$2,595.00 |
| 351N-UC |
351N castings, bare, with "UnderCover Porting". |
1,595.00 |
| 434PRO-351N |
"UnderCover Porting" to bare 351N castings, labor only. |
895.00 |
| Part # |
Description |
Price |
| LMS-352N-UC |
Complete 352N heads with "UnderCover Porting", Isky 8005 springs, 6000 series Ferrea valves & flat surfaced. |
$2,595.00 |
| 352N-UC |
352N castings, bare, with "UnderCover Porting". |
1,595.00 |
| 434PRO-352N |
"UnderCover Porting" to bare 352N heads, labor only. |
895.00 |
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