2.7L V6 Valvetrain: Difference between revisions
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(Created page with "The purpose of this article is to explore other valvetrain options using stock components from other makes and/or models. Now that Ferrea no longer sells a complete kit we need to look to other options. For camshafts please see Camshaft Specifications. The following table assumes you use the OEM valve retainer and keepers and maintain the OEM 34.5mm installed spring height. Stock lift is 8mm and lift of the commonly used Crower .349-.351" regrind is 8.9mm. {| class=...") |
m (Adding diameters to valve springs) |
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|+2.7L V6 Valve Spring Comparison | |+2.7L V6 Valve Spring Comparison | ||
!Description | !Description | ||
!I.D. | |||
O.D. | |||
!Coil Bind Height | !Coil Bind Height | ||
!Press. @34.5mm Installed Height | !Press. @34.5mm Installed Height | ||
| Line 12: | Line 14: | ||
|- | |- | ||
|OEM 2.7L Delta | |OEM 2.7L Delta | ||
|17.5mm | |||
24.7mm | |||
|23.8mm | |23.8mm | ||
|45 lbs | |45 lbs | ||
| Line 19: | Line 23: | ||
|- | |- | ||
|OEM 3.5L Sigma | |OEM 3.5L Sigma | ||
| | |||
|? | |? | ||
|? | |? | ||
| Line 26: | Line 31: | ||
|- | |- | ||
|BC1260 | |BC1260 | ||
|17.9mm | |||
24.1mm | |||
|21.85mm | |21.85mm | ||
|70 lbs | |70 lbs | ||
| Line 33: | Line 40: | ||
|- | |- | ||
|BC1220 | |BC1220 | ||
|17.96mm | |||
25.15mm | |||
|22.86mm | |22.86mm | ||
|90 lbs | |90 lbs | ||
|175 lbs | |175 lbs | ||
|185 lbs | |185 lbs | ||
|Spring base in cyl head needs machining | |Spring base in cyl head needs machining. | ||
OEM Retainer I.D. may be too small. | |||
|} | |} | ||
Revision as of 22:09, 7 December 2025
The purpose of this article is to explore other valvetrain options using stock components from other makes and/or models. Now that Ferrea no longer sells a complete kit we need to look to other options. For camshafts please see Camshaft Specifications.
The following table assumes you use the OEM valve retainer and keepers and maintain the OEM 34.5mm installed spring height. Stock lift is 8mm and lift of the commonly used Crower .349-.351" regrind is 8.9mm.
| Description | I.D.
O.D. |
Coil Bind Height | Press. @34.5mm Installed Height | Press. @8mm Lift | Press. @8.9mm Lift | Notes |
|---|---|---|---|---|---|---|
| OEM 2.7L Delta | 17.5mm
24.7mm |
23.8mm | 45 lbs | 100-105 lbs | 110-115 lbs | |
| OEM 3.5L Sigma | ? | ? | ? | ? | To be determined | |
| BC1260 | 17.9mm
24.1mm |
21.85mm | 70 lbs | 140 lbs | 150 lbs | |
| BC1220 | 17.96mm
25.15mm |
22.86mm | 90 lbs | 175 lbs | 185 lbs | Spring base in cyl head needs machining.
OEM Retainer I.D. may be too small. |
