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*Ticker* · 01-14-2010, 03:38 PM

Stock GMPP Vortecs are lift-limited to .475. This can be extended by changing the springs - but the flow tops out right around .475 so it's not really worth spending the money.

The Vortec would be a good fit for a 327; it's got a 4.00 bore and the flow is well-matched to the size of the engine given the right cam. Note that this would require an intake swap to a Vortec Performer...so you need to factor that into your cost. The headers will bolt right up. Also you'll want to have the water temp sensor hole drilled out (search on this) or find another location for it.

The gears kinda determine the cam choice - are you REALLY going to step up to 3.73s, or are you going to have the 3.08's for while? What kind of RPM are you seeing at cruise today, and what carb do you have?

01-14-2010, 03:38 PM	#2
Ticker Account Suspended Join Date: Oct 2009 Location: Sammamish, WA Posts: 2,404	Re: 327/vortec heads/cam??? Stock GMPP Vortecs are lift-limited to .475. This can be extended by changing the springs - but the flow tops out right around .475 so it's not really worth spending the money. The Vortec would be a good fit for a 327; it's got a 4.00 bore and the flow is well-matched to the size of the engine given the right cam. Note that this would require an intake swap to a Vortec Performer...so you need to factor that into your cost. The headers will bolt right up. Also you'll want to have the water temp sensor hole drilled out (search on this) or find another location for it. The gears kinda determine the cam choice - are you REALLY going to step up to 3.73s, or are you going to have the 3.08's for while? What kind of RPM are you seeing at cruise today, and what carb do you have?