L76 Cam for Jimmy
Thread Starter
Registered User
Joined: Oct 2021
Posts: 3
Likes: 0
L76 Cam for Jimmy I am going to be a full restomod on a full size 89 Jimmy. I own a shop and we had to install a used engine on a Vortec Max truck, and when I found out the engine was an all aluminum L76 core I didn't send it back. Bought the GMC and viola, a home for the L76.
Truck has 35's 4.56 gears and will have a 4L60E. Seems I won't be making the most of those rectangle port heads in this truck application, but whatever. I was told by Justin at Blackbear who is a friend of mine that he likes the Comp 54-412-11 XR265HR Specs are as follows
RPM range 1200-6000
Intake at .050 212
Exhaust at .050 218
Intake lift 0.522
Exhaust lift 0.529
LSA 114.
I want good sturdy midrange as this is a truck, and it will be used to tow from time to time. Thanks for the assist.
Truck has 35's 4.56 gears and will have a 4L60E. Seems I won't be making the most of those rectangle port heads in this truck application, but whatever. I was told by Justin at Blackbear who is a friend of mine that he likes the Comp 54-412-11 XR265HR Specs are as follows
RPM range 1200-6000
Intake at .050 212
Exhaust at .050 218
Intake lift 0.522
Exhaust lift 0.529
LSA 114.
I want good sturdy midrange as this is a truck, and it will be used to tow from time to time. Thanks for the assist.
Thread Starter
Registered User
Joined: Oct 2021
Posts: 3
Likes: 0
I have a BTR Stage 2 NSR cam that I was going to use for this engine when it came in the shop. Since it sounds like this Comp unit is worth buying do I need to move off of the LS6 valve springs I had the machine shop install that were originally for the BTR cam and use comp 918's instead?
