L-68 PCV valve?
Melting Slicks
Joined: Jul 2004
Posts: 3,067
Likes: 219
I actually think you need a 736. 390 hp and 400hp application...I'm sure but age is getting to me.
A 746 is for the 435hp and L88 application.
You can't find the correct PVC as GM replacement parts are not the same as NOS old stuff which you may find. I have an NOS 736 somewhere but don't know where I put it.
I do have a pic of an original 746 but you can pm me your email address and I can send you a pic...or go to the NCRS.org forum and search for PVC and you should find information there. I did post some original PVC's there.
Thanks, Grant
A 746 is for the 435hp and L88 application.
You can't find the correct PVC as GM replacement parts are not the same as NOS old stuff which you may find. I have an NOS 736 somewhere but don't know where I put it.
I do have a pic of an original 746 but you can pm me your email address and I can send you a pic...or go to the NCRS.org forum and search for PVC and you should find information there. I did post some original PVC's there.
Thanks, Grant
Thread Starter
Pro
Joined: Feb 2002
Posts: 734
Likes: 51
From: ATLANTIC HIGHLANDS NJ
I actually think you need a 736. 390 hp and 400hp application...I'm sure but age is getting to me.
A 746 is for the 435hp and L88 application.
You can't find the correct PVC as GM replacement parts are not the same as NOS old stuff which you may find. I have an NOS 736 somewhere but don't know where I put it.
I do have a pic of an original 746 but you can pm me your email address and I can send you a pic...or go to the NCRS.org forum and search for PVC and you should find information there. I did post some original PVC's there.
Thanks, Grant
A 746 is for the 435hp and L88 application.
You can't find the correct PVC as GM replacement parts are not the same as NOS old stuff which you may find. I have an NOS 736 somewhere but don't know where I put it.
I do have a pic of an original 746 but you can pm me your email address and I can send you a pic...or go to the NCRS.org forum and search for PVC and you should find information there. I did post some original PVC's there.
Thanks, Grant
Says the 736 is for Rochester carb or low HP 427.
So, since my L-68 has a cam upgrade, a Comp Cam Magnum 280, which is close to the 435 HP factory specs, I'll probably assume the 746 is the best choice.
Well, I hope I'm right.
Melting Slicks
Joined: Jul 2004
Posts: 3,067
Likes: 219
Thanks Alan and Grant for the info. Seems information I can find suggests the 746 was for Holleys and also refers to Spec Hi Performance.
Says the 736 is for Rochester carb or low HP 427.
So, since my L-68 has a cam upgrade, a Comp Cam Magnum 280, which is close to the 435 HP factory specs, I'll probably assume the 746 is the best choice.
Well, I hope I'm right.
Says the 736 is for Rochester carb or low HP 427.
So, since my L-68 has a cam upgrade, a Comp Cam Magnum 280, which is close to the 435 HP factory specs, I'll probably assume the 746 is the best choice.
Well, I hope I'm right.
Just pm me
Thanks, Grant
Thread Starter
Pro
Joined: Feb 2002
Posts: 734
Likes: 51
From: ATLANTIC HIGHLANDS NJ
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From: Madeira Beach, FL
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Does the 746 open with less vac then the 736?
I presume the two part #'s because of different cams and vac
lower on higher lift cams?
I pulled mine out of the valve cover still attached to the hose routed to carb base of Q-jet and it is opening fine.
I have one of them low hp 427's
If it is opening on curb idle vac probably doing its job
Marshal
I presume the two part #'s because of different cams and vac
lower on higher lift cams?
I pulled mine out of the valve cover still attached to the hose routed to carb base of Q-jet and it is opening fine.
I have one of them low hp 427's
If it is opening on curb idle vac probably doing its job
Marshal
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