Can someone explain stage differences?
Can someone explain stage differences? This is a newbie question I know but what are the differences in the stages of heads? Say for example PRC's 1.5's and 2.5's. Looking at all the info I can get on a H/C package from them to run on the Torquer II. Differences in power, driveability, etc. etc. This will be on a street and strip car. Thanks all!
stage differences are relative, there's no stadardization. within a given company there stage differences are usually related to valve sizing and spring options. also for some a bit more porting is done on the higher stages.
What I have seen is. stage 1 some porting with stock springs. Stage 2 mild porting with stiffer springs for higher lift .Stage 3 more porting,bigger valves,double springs up to .650 lift. I would go with Stage 2 or 2.5 with valves springs good to .650 lift to be on the safe side. The Torquer 2 is close to .600 lift.
TECH Resident
Joined: Nov 2002
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From: Orlando
Could be, if you're running a cam big enough to use the extra flow. Otherwise it may just be paying for something you'll never use. If your cam will only be good to .550-.575 then flow past .600 is fairly irrelevant, IMO. Just do your homework and you'll find something that works well. A lot of times, though, stage differences are proprietary jargon specific to a shop.
Registered User
Joined: Mar 2004
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From: Austin, Texas
Originally Posted by joblo1978
This is a newbie question I know but what are the differences in the stages of heads? Say for example PRC's 1.5's and 2.5's. Looking at all the info I can get on a H/C package from them to run on the Torquer II. Differences in power, driveability, etc. etc. This will be on a street and strip car. Thanks all!
Other than that it's valve size, quality of the components and the amount port work offered.
