Changes between block numbers

[SHAEF1944]

Hello folks. Wondering if anybody knows a book, CD, online reference, etc... that details the differences / modifications made between different block numbers of the B-17 ? Specifically, I am trying to help a fellow determine the changes made between the 5-block and 10-block Lockheed-Vega built B-17's. Anything available go into this much detail ? Thanks !

[DryMartini]

Fortress in the Sky
by
Peter Bowers

Has an appendix of all the F and G block numbers, and the main
changes made.

[DryMartini]

Taken verbatim from the above mentioned book.

B-17-5-VE:
Same as B-17F-1-VE except for the following -
Leak proof fuel tanks in the bomb bay; revised oxygen manifolding;
SCR/269G radio compass installed; other minor changes

B-17F-10-VE:
Similar to the B-17F-5-VE except for the following -
SCR-535 radio installed; bomb bay selector switch installed;
provisions for type D-15 fuel pump; B-3 drift meter
deleted; improved fuel tank vent outlets; radio detonator
switch moved to vertical position; external power adaptor
stowage; other minor changes

B-17G-5-VE:
Same to the B-17G-1-VE except for the following major
changes -
Removal of emergency hydraulic brake; revision of airplane
insignia; electric turbocharger regulator;swing check valve replaced
by type E-5 valve, series D; other minor changes

B-17G-10-VE:
Same to the B-17G-5-VE except for the following major
changes -
British Lorenz blind approach radio installed;
A-2A ball turret with oxygen swivel gland installed; and
other minor changes.

[hang the expense]

Hey Bill, There will be a knock at the door and two really big friendly guys want to take you some place nice and quite and peaceful.