[bird72]

So THX to a great member here for a crank. Local machinist just did complete diagnosis that explained motor history. Bottom end was built 20+ yrs ago.

Bad align bore when 4 bolt caps added then.
Bad piston clearance ring to bore.
Result very bad crank scarring one spot and scuffed forged pistons. I used a Chevy racer machine shop guy in Oregon. Bonehead errors. Bad move I guess. I did hammer on that engine.

Good news is Matt's HO heads reported as "very nice".

Very happy with my machinists diligence. Block off to be align bored properly.

Anyone here use Cliff Rugles round port roller cam? Custom grind he recommends. Impressive dyno sheet on an SD. Nice power sub 5500.

[4birds]

Anthony, its good to hear your HO build is moving forward.
I built my 72 T/A HO engine almost identical to Rocky Rotella's build posted on this thread on 8-18-15. (post #2552) I used the same Comp Cams custom roller that he used. My car runs very strong, and is pretty docile just cruising around town.
Prior to that build, I had a Crane blueprint Ram Air IV cam with Rhodes lifters. That combo ran great for about 15+ years. With Radial T/A's, 3.42's, M22 trans through full exhaust it ran 14.29 @ 103 here in Salt Lake City (Altitude 4400')
My recent rebuild using the Comp hydraulic roller cam feels just a little bit stronger. I haven't run it down the quarter mile yet to see the actual difference. It still hurts to think of the cost of going to the hydraulic roller vs. the old flat tappet cams.

Jay

[Formulabruce]

Originally Posted by bird72

So THX to a great member here for a crank. Local machinist just did complete diagnosis that explained motor history. Bottom end was built 20+ yrs ago.

Bad align bore when 4 bolt caps added then.
Bad piston clearance ring to bore.
Result very bad crank scarring one spot and scuffed forged pistons. I used a Chevy racer machine shop guy in Oregon. Bonehead errors. Bad move I guess. I did hammer on that engine.

Good news is Matt's HO heads reported as "very nice".

Very happy with my machinists diligence. Block off to be align bored properly.

>> One thing to keep in mind that usually is NOT in the mind of a machinist is that when the Align bore takes place,( Its NOT a Chevy) The crank is often placed "higher" in the block, which isnt a big deal if you run a ROPE SEAL. If you run a IA 2 piece seal you should make SURE some work is done to Ensure the rough cast Seal grove is concentric to the crank. I have been down this road a couple times and had perfect running engines PISS out the rear main...Just a friendly heads up Good luck!!

[bird72]

For FYI original info I got from Cliff:

"455 Super Duty, no porting anyplace, zero decked/squared, Icon pistons on Eagle rods, stock #16 heads, stock intake, q-jet and stock manifolds. It cranked out 440hp/540tq on the dyno......

The cam is a custom grind, specs out at 284/296, 230/242 and 112LSA. Degree the intake at 108-109 for auto trans, 109-110 for stick shift cars. It’s got .361” lobes..."