670hp LS3 Cylinder Heads 265cc LS2 LS3 Rectangle Port, Assembled, Ferrea Valves & Proline High RPM Springs (PAC)
*HIGH* RPM PAC Springs - 0.630" Max Lift | 460lbs open
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Description
DRP LS2 LS3 L92 Rectangle Port Cylinder Heads - Assembled for High RPM with PAC Springs & Ferrea 6000 Valves
Sold as a pair and assembled with Ferrea 6000 Series stainless valves, bronze guides, multi-angle valve seats and high-rpm DRP/PAC endurance valve springs.
670 HP airflow potential. Bolt-on LS3 rectangle port upgrade! Built with the right valve springs & valves from the start.
DRP-LS3-265-HRFVPL-RPM Specifications
| Brand | DRP |
| Part Number | DRP-LS3-265-HRFVPL-RPM |
| Cylinder Head Type | LS2 / LS3 / L92 rectangle port |
| Quantity | Pair, 2 assembled cylinder heads |
| Material | 356 aluminium |
| Intake Runner | 265cc |
| Exhaust Runner | 86cc |
| Chamber | 66cc to 68cc depending on valve dish |
| Intake Valve | 2.165" Ferrea 6000 Series stainless |
| Exhaust Valve | 1.600" Ferrea 6000 Series stainless |
| Valve Guides | Bronze |
| Valve Seats | CNC machined Multi-angle valve seats |
| Valve Springs | DRP-9415P polished Proline RPM dual springs by PAC |
| Spring Specs | 200 lb @ 1.800", 455 lbs open @ 0.620" lift (415lbs/in & 0.630" max lift) |
| Minimum Bore | 4.000" |
| Intake Port Location | Stock location |
| Exhaust Port Location | Stock location |
Fitment Notes
Suits LS2, LS3 and L92-style rectangle port combinations with a 4.000" minimum bore.
Stock intake and exhaust port locations help with manifold and header fitment, but final checks still matter. Confirm cam lift, piston-to-valve clearance, pushrod length, rocker geometry, head gasket bore, compression ratio and tune before final assembly.
DRP LS3 265cc Flow Figures
Tested on 4.000" bore @ 28"
| Valve Lift | Intake Flow | Exhaust Flow | HP Potential |
|---|---|---|---|
| .200" | 134 cfm | 108 cfm | |
| .300" | 201 cfm | 145 cfm | |
| .400" | 256 cfm | 169 cfm | |
| .500" | 295 cfm | 189 cfm | |
| .550" | 303 cfm | 197 cfm | |
| .600" | 312 cfm | 202 cfm | 643 HP |
| .650" | 320 cfm | 207 cfm | 660 HP |
| .700" | 325 cfm | 210 cfm | 670 HP |
| .750" | 328 cfm | 212 cfm |
Note: Flow figures tested on a 4.000" bore at 28". HP figures are airflow-based potential and depend on the complete engine combination.
Specifications
| SKU | DRP-LS3-265-HRFVPL-RPM |
| Brand | DRP |
| Unit Of Measure | ea |
| Bundle Description | PAIR |
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