[shaker455]

Originally Posted by TAQuest

I bought a 1967 Firebird 400 convertible out of an estate. The deceased owner had the drivetrain build mostly done. I finished the body and now I'm going to tune the engine for the street. I have a thick notebook of all the parts used.

It has a 1975 400 block.

Edelbrock 60599 Heads 72 cc

Edelbrock Cam
Duration at 0.006" Lift: Intake: 278° Exhaust: 288°
Duration at 0.050" Lift: Intake: 204° Exhaust: 214°
Lift at Cam: Intake: 0.280" Exhaust: 0.295"
Lift at Valve: Intake: 0.420" Exhaust: 0.442"
Timing at 0.050" lift: Open Close
Intake: 3° ATDC 27° ABDC
Exhaust: 42° BBDC 8° BTDC
Centerlines: Lobe Separation - 110° Intake Centerline - 105°


COMP Cams Aluminum Roller Rocker Arms

Rocker Arm Ratio:
1.5

Rocker Arm Style:
Full roller

Stud Size:
7/16 in.

Rocker Arm Material:
Aluminum

Slot Width (in):
0.562 in.

Maximum Spring Diameter (in):
1.500 in.

Rocker Arm Finish:
Red anodized



Edelbrock Performer Intake Manifold

Edelbrock 1411 Carb

Doug's Headers

Super Muncie 4 Speed

3:36 Rear Gears Posi

Funtional Ram Air

I just finished a compression test.

On both #1 and #2, cold and dry, 215 psi.

What can I expect for street performance?

What octane am I going to need to use?

Any suggestions on tuning are greatly appreciated.

Thanks!

No mention of pistons used but I don't think the CR is the culprit .
Most likely the cam is this deal.
cylinder pressure is too great and will detonate.
Suggest a more modern cam like Lunati VooDoo series...703 cam is a good place to start.