Quote:
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!
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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.