289
Bored .040
4 valve relief pistons
Deck height .016
Replaced the bone stock heads with press in studs with a set of stock heads ported and polished and just back from the machine shop.
The heads have GM valves 1.87/1.60
The heads came previously ported and polished with the valves already in them.
I cc'd one of the chambers at 53cc.
Pulled previous PBM hydraulic flat tapped cam
Installed new:
Thumpr Hydraulic roller cam 31-600-8
Comp Cams timing set 2120 Dialed in at 0* and spot checked with degree wheel
Howards Retro Link Bar roller lifters for SBF 91168
Felpro Head gasket .047 compressed and 4.100 bore- torqued to 50/60/70 ft lbs with new ARP head bolts.
New ARP Rocker studs with 2.000 effective length - previous studs were too short for the Miller's per Paul @ Hyflodynamics
Comp Cams springs - 986-16 installed to spec'd height by machine shop.
Miller SBF 1.6 roller rocker arms (PVS 3060 part number)
Verified 10* angle between rocker stud and valve
Cylinder #1 - removed dual springs - replaced with checker springs on intake and exhaust
Cam card calls for .3320 lobe lift and gross valve lift of .531
Dial indicator verifies what the cam card calls for using just push rod with max lobe lift on intake of .3320
Did Mid-Lift process on push rod only in bringing push rod to .166.
Installed rocker - adjusted nut until I got mid-lift number on retainer/valve from 0 to .265.
Checked for 90 degree from rocker top to poly lock - ended up with a push rod length of 6.646 per Miller - mid lift instructions.
(as a note I get the same results with 6.3 to 6.550 length push rod lengths.
I am totally stumped. I place the dial indicator on the retainer or even the roller ( have tried both multiple times - verifying everything is as perpendicular as possible.
Max lift continuously gives me a dial indicator number of .550 (too much lift).
Any ideas?
I have to use checker springs as the Howards have a rivet for the link bars that do not allow me to convert it to a solid lifter.
So as long as there is no binding on the rocker - push rod length should not matter - as lift is lift....
I'm frustrated as I have walked away from this the last 2 nights not understand what might be happening?
I'm open for any suggestions at this point.
I haven't ordered push rods as I was double checking the max lift before I ordered them. So here I sit , frustrated.
Thanks for and advance and the counseling session
Bored .040
4 valve relief pistons
Deck height .016
Replaced the bone stock heads with press in studs with a set of stock heads ported and polished and just back from the machine shop.
The heads have GM valves 1.87/1.60
The heads came previously ported and polished with the valves already in them.
I cc'd one of the chambers at 53cc.
Pulled previous PBM hydraulic flat tapped cam
Installed new:
Thumpr Hydraulic roller cam 31-600-8
Comp Cams timing set 2120 Dialed in at 0* and spot checked with degree wheel
Howards Retro Link Bar roller lifters for SBF 91168
Felpro Head gasket .047 compressed and 4.100 bore- torqued to 50/60/70 ft lbs with new ARP head bolts.
New ARP Rocker studs with 2.000 effective length - previous studs were too short for the Miller's per Paul @ Hyflodynamics
Comp Cams springs - 986-16 installed to spec'd height by machine shop.
Miller SBF 1.6 roller rocker arms (PVS 3060 part number)
Verified 10* angle between rocker stud and valve
Cylinder #1 - removed dual springs - replaced with checker springs on intake and exhaust
Cam card calls for .3320 lobe lift and gross valve lift of .531
Dial indicator verifies what the cam card calls for using just push rod with max lobe lift on intake of .3320
Did Mid-Lift process on push rod only in bringing push rod to .166.
Installed rocker - adjusted nut until I got mid-lift number on retainer/valve from 0 to .265.
Checked for 90 degree from rocker top to poly lock - ended up with a push rod length of 6.646 per Miller - mid lift instructions.
(as a note I get the same results with 6.3 to 6.550 length push rod lengths.
I am totally stumped. I place the dial indicator on the retainer or even the roller ( have tried both multiple times - verifying everything is as perpendicular as possible.
Max lift continuously gives me a dial indicator number of .550 (too much lift).
Any ideas?
I have to use checker springs as the Howards have a rivet for the link bars that do not allow me to convert it to a solid lifter.
So as long as there is no binding on the rocker - push rod length should not matter - as lift is lift....
I'm frustrated as I have walked away from this the last 2 nights not understand what might be happening?
I'm open for any suggestions at this point.
I haven't ordered push rods as I was double checking the max lift before I ordered them. So here I sit , frustrated.
Thanks for and advance and the counseling session