sixpakmopar
sixpakmopar
has anybody converted thier 360 to 4 bolt mains? i just bought a set of mopar performance caps with bolts new in the box off of ebay. there is also a set to fit 340s for 60.00 from the same guy
360 4 bolt mains
- Thread starter sixpakmopar
- Start date
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dilley340
Well-Known Member
I used Milodon #11300 4-bolt main caps on my '73 340. The outer bolts are splayed btw.
$60.00 sounds way too cheap for the 340 set you found on ebay. Machine work would cost more than that. The Milodon mains run about $250.00 from Summit & Jeg's. :?
Not sure makes 'em for MP... Milodon perhaps? What did you pay for your set?
$60.00 sounds way too cheap for the 340 set you found on ebay. Machine work would cost more than that. The Milodon mains run about $250.00 from Summit & Jeg's. :?
Not sure makes 'em for MP... Milodon perhaps? What did you pay for your set?
sixpakmopar
sixpakmopar
60.00 this included shipping
Mark Nixon
Senior Moments Member
So, what's the point of a 4 bolt main cap on a smallblock Mopar?
Never seen or heard of main strength issues on a small block, they usually fail from consequential damage, not as a primary fault.
Save your $$.
Mark.
Never seen or heard of main strength issues on a small block, they usually fail from consequential damage, not as a primary fault.
Save your $$.
Mark.
dilley340
Well-Known Member
I'm using a steel 4" stroker crank / 6-71 blower combo and wanted a bullet proof bottom end.
mrspeeddemon
"The Chrysler Kid"
the Mopar erf. ones aren't as fancy as your Milodon ones- their straight bolt ductile iron main caps- and your right the machine work WILL cost more than the caps did- I work at a machine shop so I bought a set of each.
Mark Nixon
Senior Moments Member
The 4 bolt M.P. caps are DESIGNED for the T/A, X and R series blocks.
Adding them to a stock block, IMO only serves to weaken the main areas on that block.
Take a look at the main areas on an R (Or T/A or 'X') series block and compare it to the stock block, then you'll see what I mean.
You're just weakening what you already have by "4-bolting" it.
Mark.
Adding them to a stock block, IMO only serves to weaken the main areas on that block.
Take a look at the main areas on an R (Or T/A or 'X') series block and compare it to the stock block, then you'll see what I mean.
You're just weakening what you already have by "4-bolting" it.
Mark.
Guitar Jones
aka Angry Johnny
I agree with Mark, not a good idea in a regular passenger car block. This is one of those Chevy things, the Chevys have them so we should too. It's BS. I'm making nearly 600 HP with a nonfilled late model stock stroke 360 block with just main studs. If you absolutely insist on four bolt mains then buy an MP R3 block, I think the 340 replacement block has 4 bolt mains as well (not sure though) but if it doesn't I'm sure it's got the thick webbing to use them.
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