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Re: Main Caps
[Re: Clanton]
#2397130
11/02/17 01:33 AM
11/02/17 01:33 AM
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Joined: Aug 2003
Posts: 43,211
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,211
Bend,OR USA
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Do NOT use steel caps
Why ?
Street motor with around 500 HP that will never see the track or 6200 RPM's
Steel expands at a different rate than cast grey iron does, same thing on aluminum main caps, the expansion rate and holes in them do not expand the same as the cast iron does  Hence my preference of using cast ductile iron  I had three RB blocks with cracked main webs  The 400 blocks are way better to start with than any OEM 440 block for any build that you want to make more than 600 HP on pump gas or above 650 HP on race gas   You had 3 crack where others have had none,something going on there. Your correct sir, if you build enough HP or abuse the RB blocks enough they will crack sooner than the 400 blocks will. I cracked one 426 M.W. RB block when a rod broke from spinning a rod bearing in low gear me and keeping my right foot down until it broke instead of lifting   The other two 440 blocks where cracked when the customers brought them into my shop BTW, many other racers and engine builders have had the main webbing crack on many stock RB blocks You can patch them up but you can't prevent the failures in the main webbing by bandaiding the stock RB blocks
Last edited by Cab_Burge; 11/02/17 01:34 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Main Caps
[Re: bee1971]
#2397331
11/02/17 02:50 PM
11/02/17 02:50 PM
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Joined: Jan 2003
Posts: 13,369
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,369
Marion, South Carolina [><]
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Milidon does not sell the Ductile iron caps now Do NOT use steel caps on a cast iron block  I like and use to use ductile iron main caps on all my builds over 600 HP when I could buy them, now I use 440 Source aluminum with main studs, no girdles I wish that we could buy good blocks with four bolt main caps and thick cylinder walls  Do NOT use steel caps Why ? Street motor with around 500 HP that will never see the track or 6200 RPM's For this combo, and the OP's combo, I wouldn't bother changing the caps. The stock ones will be fine.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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