Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > 911 Engine Rebuilding Forum

LinkBack Thread Tools Rate Thread
Thread Post New Thread    Reply
Eye of the Toiger
matty74's Avatar
Join Date: Oct 2005
Location: Sydney, Australia
Posts: 1,204
Valve size for 2.7

Hi there, if some one can give me an idea of which direction I can take

I'm building my engine 2.7 with JE pistons Scams and webers.

I have a stock CIS motor, do I increase the valve size if so what too?

1973 911 RSR clone powered by 77 3.0 turbo
Old 12-13-2005, 05:17 PM
  Pelican Parts Technical Article Directory    Reply With Quote #1 (permalink)
Registered User
Join Date: Mar 2003
Location: Australia
Posts: 216

Valve sizes won't change. The ports will require enlarging and the FI holes will need to be plugged.

Were it me, I'd give them to a shop with a good reputation for working on these heads and get them to do the lot - ports, new valves, new guides, valve springs etc... Done properly, they'll provide you with the basis for a great zingy road engine.

914/6 GT (Repro) Tarmac Rally car
928 S4 - 1989
911SC - 1980
Jeep Cherokee
Ford/Mazda 4WD Turbo
Old 12-13-2005, 05:46 PM
  Pelican Parts Technical Article Directory    Reply With Quote #2 (permalink)
Registered User
jluetjen's Avatar
Join Date: Oct 2001
Location: Westford, MA USA
Posts: 8,593
Do you have a 2.7 normal or a 2.7S? I'm pretty sure that the valve size should be adequate since they are the same dimension as used in the 2.7RS. If you have 2.7S heads, they are most likely fine for street use since I believe the intake ports are 35 mm. If you have 2.7 normal heads, I'd port them out to 36 mm like the 2.2S, 2.4S and the 2.7RS used.
'69 911E

"It's a poor craftsman who blames their tools" -- Unknown
"Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman
Old 12-13-2005, 05:48 PM
  Pelican Parts Technical Article Directory    Reply With Quote #3 (permalink)

Thread Tools
Rate This Thread
Rate This Thread:


All times are GMT -8. The time now is 02:44 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2017 Pelican Parts LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.