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427 Marine/Industrial block question

May 15 2017 at 8:49 PM
Froman87  (Login Froman87)
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One some of the later 427 blocks that were cast as side oilers but drilled as top oilers there is a machined area right where the side oiler "bump" is located on the driver's side of the block. What was the purpose of it? Was it only done on the marine 427 blocks or did the industrial 427 blocks have this as well. I searched the forum but it is still unclear to me which blocks have this and why.

427 marine top oiler machined area
upload image free

 
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Cory
(Login 427Fastback)
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Re: 427 Marine/Industrial block question

May 15 2017, 10:40 PM 

I believe it is for clearance on the mounts the boats used....

 
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Rory McNeil
(Login RM428)
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Re: 427 Marine/Industrial block question

May 16 2017, 6:00 AM 

The only 427 blocks that I have seen with that area cut away was on a marine engine. My 427 was cast in 1970, and I am not sure if it is a service or an industrial block, but it is a hyd. lifter sideoiler block, with no such machining in that area. I do know that when I went to install it in my Fairmont, I had to modify the driver side motor mount, since the bolt spacing was different, to accomodate the side oiler bulge. Maybe these marine blocks are cut away to allow the lower motor mount bolt hole remain in the normal non sideoiler location. Has anybody ever measured the motor mount bolt pattern between the sideoiler vs non sideoiler 427 blocks?
428 powered Fairmont drag car, Best ET:9.97 @132.56MPH, best 60 ft: 1.29
59 Meteor 2 dr. sedan 332, Ford O Matic
74 F350 ramp truck 390 4speed
1985 Mustang 331 4 speed Best ET10.29at 128.7mph, 1.40 69 foot

 
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Royce
(Login RoyceP)
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Rory has it right

May 16 2017, 2:06 PM 

The industrial 427 blocks are the same way. It is so that the standard 360/ 390 / 428 motor mount sits flat like it would on a 360 / 390 / 428 block./
[linked image]
1910 Model T Ford touring Red / Black
1914 Model T Ford touring Maroon / Black
1917 Model T Ford Torpedo runabout green
1915 Model T Ford touring Black of course!
1968 Mercury Cougar 428CJ Ram Air Red / Black/ Black
1968 Cougar XR7-G 390-2V X code Red / Black
1968 Cougar GTE 427 Augusta Green / Saddle
http://www.supermotors.net/vehicles/registry/15029/50071-2

 
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doug smith
(Login cjshaker)
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Machined for standard motor mount...

May 16 2017, 6:50 AM 

The sideoiler blocks have a different mounting pattern because the standard hole in that spot interferes with the side oil galley. Since that is machined as a top oiler, that area is machined for a standard mounting pattern with no regard for the unmachined sideoiler galley. Still a perfectly good block, it just can't be machined as a sideoiler now.

 
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john vermeersch
(Select Login johnvermeersch501)
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The purpose of that flat area is to mount

May 16 2017, 7:51 AM 

the voltage regulater and resister, which are on a flat plate, bolted to the block....A Chris-Craft choice..

 
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Bill Troth
(Login billtroth)
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I never noticed it on my marine block

May 16 2017, 9:11 AM 

I'll have to take a closer look. Seems like it would be a good place to attach a dedicated engine ground cable from the battery in the trunk. I assume a 3/8-16 thread?
Bill Troth
AFTERSHOCK 427
64 Galaxie NSS
[linked image]

 
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C5HM
(Login C5HM)
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This looks like the reason to me.

May 16 2017, 4:44 PM 

[linked image]

 
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