These aftermarket main caps will strengthen
not only factory 2 bolt blocks, but also 4 bolts. Unlike the factory
main caps, these not only have more cross sectional strength, but the real
strength secret is in the angled side bolts!
The side bolts are angled so they pull from the side walls of the block
and not the flimsy main web area. A bolt that is angled will require
a massive amount of additional load to flex or stretch, let alone break,
compared to a conventional straight up bolt. The side bolts heavily
load the main cap against the register step which stops "cap walk". It is
main cap walk that causes a great amount of unforeseen bearing damage and
horsepower loss.
Milodon main caps are precision machined from high strength ductile
material which has the proper balance of strength yet is not too rigid
like a billet main cap to allow transfer of increased shock loads to the crank and bearings.
In this case, more is not better when it comes to hardness.
Only .030" of material removal is required upon initial installation,
which will allow 100% cleanup on a damaged block. The drill bushing
used to drill and tap the side bolt holes is included in the kit. The
side bolts can be installed by anyone with a hand drill and a tap. If
the block has square main registers, the block needs only a standard
align bore to finish the job. Milling the mains is only necessary if
the main cap registers are not square.
All necessary bolts, washers and the drill bushing are included in the
center three main cap kit. For maximum strength the installation of Milodon
main studs are highly recommended. |
| SMALL BLOCK CHEVY |
MAIN CAP # |
MAIN STUDS
without windage tray |
MAIN STUDS
with
windage tray |
| 283-327 Journal (Angled Bolts) |
11050  |
81128 |
81129 |
| 283-327 Journal, Front Cap, 2 Bolt |
11053 |
|
|
| 350 Journal, Factory 2 Bolt (Angles Bolts)1 |
11150 |
81128 |
81129 |
| 350 Journal, Front Cap, 2 Bolt |
11153 |
|
|
| 350 Journal, Factory 4 Bolt (Angled Bolts)2 |
11160 |
81128 |
81129 |
| 350 Journal, Factory 4 Bolt (Straight Bolts) |
11165 |
81130 |
81131 |
| 400 Journal, 2 or 4 Bolt Blocks (Angled Bolts) |
11180 |
81128 |
81129 |
| 400 Journal, Front Cap, 2 Bolt |
11183 |
|
|
| 400 Journal (Straight Bolts) |
11185 |
81130 |
81131 |
| BIG BLOCK CHEVY |
MAIN CAP # |
MAIN STUDS |
MAIN STUDS |
| 396-454, 2 or 4 Bolt Blocks (Angled Bolts) |
11200 |
81133 |
81134 |
| 396-454 (Straight Bolts) |
11205 |
81140 |
81141 |
| 396-454, Front Cap3 , Angled Bolt |
11210 |
Note 6 |
Note 6 |
| 396-454, Front Cap3, Straight Bolt |
11211 |
Note 6 |
Note 6 |
| NOTE: 1-Narrow register
4.490" wide. 2-Wide register 6.200" wide. 3-Requires
slight pan clearancing in some areas. |
|
| FORD |
MAIN CAP # |
MAIN STUDS |
MAIN STUDS |
| 302 (Straight Bolts) |
11400 |
81155 |
81156 |
| 351W (Angled Bolts)4 |
11420 |
81175 |
81164 |
| 351C (Angled Bolts) |
11440 |
81169 |
81170 |
| 351C, Front Cap (Angled Bolt) |
11445 |
Note 6 |
Note 6 |
| 429/460 (Angled Bolts) |
11450 |
81188 |
81189 |
| CHRYSLER |
MAIN CAP # |
MAIN STUDS |
MAIN STUDS |
| 318-340 (Angled Bolts) |
11300 |
81183 |
81184 |
| 360 (Angled Bolts) |
11310 |
81183 |
81184 |
| 354 (Angled Bolts) |
11320 |
81183 |
|
| 392 (Angled Bolts) |
11350 |
81183 |
|
| 383-440 Wedge (Straight Bolts) 2 Bolt |
11360 |
81183 |
|
| 383-440 Wedge (Straight Bolts) 2 Bolt 5 Cap Set |
11365 |
81188 |
|
| PONTIAC, OLDS |
MAIN CAP # |
MAIN STUDS |
MAIN STUDS |
| Pontiac 455 (Angled Bolts) |
11500 |
81222 |
81224 |
| Pontiac 350-400 (Angled Bolts) |
11505 |
81222 |
81224 |
| Olds 400, 425, 455 (Straight Bolts) 2 Bolt |
11550 |
81175 |
|
| Olds, Front Cap, 2 Bolt |
11555 |
|
|
| AUSTRALIAN HOLDEN |
MAIN CAP # |
MAIN STUDS |
MAIN STUDS |
| 253-308 (Angled Bolts) |
11570 |
81145 |
81146 |
| |
| NOTE: 4-Requires
SVO block pan notch or some clearancing in the #4 main web area
of the pan. |
|
