Need help for edelbrock head
Thread Starter
Instructor
Joined: Apr 2007
Posts: 158
Likes: 0
From: Montréal Quebec
Need help for edelbrock head
I want to put some edelbrock RPM heads on my 1981 Corvette. I already have the edelbrock RPM intake, stock cam, stock Qjet, headers without cat.
First I want to know which one to choose for the best fit :
PERFORMER RPM WITH ANGLED PLUGS
Chamber Intake Port Valve(in/ex) Bare(single) Complete(single)
70cc 170cc 2.02"/1.60" #60619* #60719*
64cc 170cc 2.02"/1.60" #60949* #60999*
PERFORMER RPM WITH STRAIGHT PLUGS
70cc 170cc 2.02"/1.60" #60639* #60739*
64cc 170cc 2.02"/1.60 " #60889* #60899*
Second, can I bolt on directly or I need to modify roller rockers, or something like that.
Thanks
First I want to know which one to choose for the best fit :
PERFORMER RPM WITH ANGLED PLUGS
Chamber Intake Port Valve(in/ex) Bare(single) Complete(single)
70cc 170cc 2.02"/1.60" #60619* #60719*
64cc 170cc 2.02"/1.60" #60949* #60999*
PERFORMER RPM WITH STRAIGHT PLUGS
70cc 170cc 2.02"/1.60" #60639* #60739*
64cc 170cc 2.02"/1.60 " #60889* #60899*
Second, can I bolt on directly or I need to modify roller rockers, or something like that.
Thanks
Melting Slicks
Joined: Jul 2006
Posts: 2,373
Likes: 6
From: Baltimore MD
I want to put some edelbrock RPM heads on my 1981 Corvette. I already have the edelbrock RPM intake, stock cam, stock Qjet, headers without cat.
First I want to know which one to choose for the best fit :
PERFORMER RPM WITH ANGLED PLUGS
Chamber Intake Port Valve(in/ex) Bare(single) Complete(single)
70cc 170cc 2.02"/1.60" #60619* #60719*
64cc 170cc 2.02"/1.60" #60949* #60999*
PERFORMER RPM WITH STRAIGHT PLUGS
70cc 170cc 2.02"/1.60" #60639* #60739*
64cc 170cc 2.02"/1.60 " #60889* #60899*
Second, can I bolt on directly or I need to modify roller rockers, or something like that.
Thanks
First I want to know which one to choose for the best fit :
PERFORMER RPM WITH ANGLED PLUGS
Chamber Intake Port Valve(in/ex) Bare(single) Complete(single)
70cc 170cc 2.02"/1.60" #60619* #60719*
64cc 170cc 2.02"/1.60" #60949* #60999*
PERFORMER RPM WITH STRAIGHT PLUGS
70cc 170cc 2.02"/1.60" #60639* #60739*
64cc 170cc 2.02"/1.60 " #60889* #60899*
Second, can I bolt on directly or I need to modify roller rockers, or something like that.
Thanks
Thread Starter
Instructor
Joined: Apr 2007
Posts: 158
Likes: 0
From: Montréal Quebec
Both straight or angled will be fine,i just bought victor jr angle heads and the angle will be tight getting to your plugs,but they make short plugs so no problem with angle plugs heads either.The cc depends on how much compression you want,64 will give you more compression and the 70cc will give a little less.
64 or 70cc : Whats the difference ?
Pro
Joined: Jan 2006
Posts: 599
Likes: 0
From: New York
I'm not sure about straight as apposed to angled but I do believe the smaller the CC the higher the CR n the bigger the CC the lower the CC....I'm sure some of more knowledgable will chime in with more info....Jerrylee///
Race Director
Joined: Jan 2003
Posts: 15,177
Likes: 90
From: State of Confusion
I 'assume' your '81 Corvette came with heads having 76 cc (cubic-centimeter) volume combustion chambers, resulting in a compression-ratio of about 8.2:1 ~
using heads with smaller chambers will raise the compression, giving you more HP/TQ:
70cc heads will yield about 8.7:1, while the 64cc heads may provide squeeze as-high-as 9.3:1
using heads with smaller chambers will raise the compression, giving you more HP/TQ:
70cc heads will yield about 8.7:1, while the 64cc heads may provide squeeze as-high-as 9.3:1
Race Director
Joined: Jan 2003
Posts: 15,177
Likes: 90
From: State of Confusion
without looking at the link, 'bare' would refer to the 'bare' castings themselves, with no related pieces, like valves, valve-springs, or possibly even rocker-studs:
'complete' would probably mean just add head-gaskets, head-bolts & rocker-arms
'complete' would probably mean just add head-gaskets, head-bolts & rocker-arms
