4 Bolt main & Splayed 4 Bolt main??
#1
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Join Date: Jun 2001
Location: "Shoulda Gotton An LS1 Racin"
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4 Bolt main & Splayed 4 Bolt main??
I am now trying to learn about the bottom half of the LT1. I have a block waiting for a 383 build up but need to do homework ( And save $$$ ) What does it mean to be splayed & what, if any, are the benefits. Thanks. P.S. There will probably be a lot more uneducated questions coming from me over the next few months so be patient. PPPLLEEASSEEEE
#2
The outer bolts on "splayed" caps are angled outward as this picture shows pretty well: http://www.sdpc2000.com/images/produ...0_6781996.jpg. This means that the outer bolt/stud is threaded into a stronger part of the block than with straight caps. FWIW I am currently running straight nodular iron 4-bolt caps like this http://www.sdpc2000.com/images/produ...09_4526595.jpg and the motor is still together after two years and >12K miles with >700rwhp. So these must truly be need only for pretty exotic buildups.
Rich Krause
Rich Krause
#3
In my opinion... and this is based on my conversations with some really good builders over the years.... the 4-bolt is good enough for any street driven car. If you have a race-only (especially endurance type race) engine then I'd definitely step up to splay.
My old factory 4-bolt 377's bearings looked much worse off after a season of thrashing in that block than they did in my splayed bow-tie block. Hard to say... could have had alot more to do with superior oiling and having a precision machined block. That's what keeps engines alive though, even the production blocks.
-Mindgame
My old factory 4-bolt 377's bearings looked much worse off after a season of thrashing in that block than they did in my splayed bow-tie block. Hard to say... could have had alot more to do with superior oiling and having a precision machined block. That's what keeps engines alive though, even the production blocks.
-Mindgame
#4
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Join Date: Jun 2001
Location: "Shoulda Gotton An LS1 Racin"
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Originally posted by rskrause
The outer bolts on "splayed" caps are angled outward as this picture shows pretty well: http://www.sdpc2000.com/images/produ...0_6781996.jpg. This means that the outer bolt/stud is threaded into a stronger part of the block than with straight caps. FWIW I am currently running straight nodular iron 4-bolt caps like this http://www.sdpc2000.com/images/produ...09_4526595.jpg and the motor is still together after two years and >12K miles with >700rwhp. So these must truly be need only for pretty exotic buildups.
Rich Krause
The outer bolts on "splayed" caps are angled outward as this picture shows pretty well: http://www.sdpc2000.com/images/produ...0_6781996.jpg. This means that the outer bolt/stud is threaded into a stronger part of the block than with straight caps. FWIW I am currently running straight nodular iron 4-bolt caps like this http://www.sdpc2000.com/images/produ...09_4526595.jpg and the motor is still together after two years and >12K miles with >700rwhp. So these must truly be need only for pretty exotic buildups.
Rich Krause
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