DucatiDon

My flat windage tray had to be clearanced to avoid having my rods hit it.
The oil pan too...too close to the 7/8 counterweights at the pan rail....

Tom454

I'll try to check this (pan) today. I have to play musical chairs with several engines to get to my OEM pan.

Tom454

I tried a dozen online calculators and kept getting conflicting numbers so I did this myself in Excel. One caveat is that I don't know which gasket I will be using so I don't know the actual gasket diameter... I used the bore diameter instead.

Static Compression Ratio:
Volume at BDC over Volume at TDC
Volume at BDC:
Volume of flat top piston sweep: PI * 4.021/2 * 4.021/2 * 3.75 47.6199895
Volume of valve relief's: 7cc=ci 7cc*0.0610237441 0.427166209
Volume, ring to top of piston: ((PI()*4.021/2*4.021/2)-(PI()*4.018/2*4.018/2))*3/16 0.003551521
Volume of gasket assuming .038 and cyl bore PI * 4.021/2 * 4.021/2 * .038 0.482549227
Volume of valve chamber (head cc's): 70*0.0610237441 4.271662087
Volume piston to deck: PI * 4.021/2 * 4.021/2 * .015 0.190479958
Total Volume at BDC: 52.9953985

Volume at TDC:
Volume of valve relief's: 7cc=ci 7cc*0.0610237441 0.427166209
Volume, ring to top of piston: ((PI()*4.021/2*4.021/2)-(PI()*4.018/2*4.018/2))*3/16 0.003551521
Volume of gasket assuming .038 and cyl bore PI * 4.021/2 * 4.021/2 * .038 0.482549227
Volume of valve chamber (head cc's): 70*0.0610237441 4.271662087
Volume piston to deck: PI * 4.021/2 * 4.021/2 * .015 0.190479958
Total Volume at TDC: 5.375409002
Recalculated Static Compression Ratio: 9.858858829

If I change the heads to 64 cc it's 10.50637966

Any flaws in this math?

Tom454

Some more data:
The OEM 1966 327 oil pan clears the Eagle 3.75 crank... but it is close.
The Scat rods cleared the block no problem, but I did relieve the block a hair at rod #3 and 5 JIC.
I purchased the Summit 226008 and Edelbrock 2101 Intakes.
The ports are not uniform, but I measured the same port on each manifold.
The Summit 226008 Intake ports are approximately 1.889 x 1.158. (2.19sq inch).
The Edelbrock 2101 Intake ports are approximately 1.861 x 1.179. (2.19sq inch).
The Z28 3932472 Intake ports are approximately 2.036 x 1.213. (2.47sq inch).
The Z28 runners are visibly larger internally and externally than the other manifolds.
I measured the height from the china rail up to the spot centered between the square port carb stud holes.
Summit: 4-1/8"
Edelbrock: 4-1/8"
Z28: 4-3/4"

The Z28 seems the better choice for my 383 (381) so I am sending the other manifolds back. I'll lose about $35 in shipping but at least I made an informed decision.

The GM Z28 manifold and Holley List 3667 (Chrysler app) fit under the 327 OEM hood with a GM drop base air cleaner. This was the configuration before I started this project.

The Z28 is a square bore manifold so now I have to get a carb. I have a 570cfm (List 3667) but that may be too small. The intent was to use a jetted down 800cfm List 6211 spread bore that I have on my 454 (replacing with TriPower) but the game plan has changed.

lt1z

...