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Topic: 4 bolt main

in Forum: C3 Engines


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4 bolt main

Posted: 2/23/05 2:48pm Message 1 of 10
decrepid13
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Lisle, IL - USA
Joined: 6/18/2002
Posts: 125
Vette(s): 1973 coupe Under Construction

First off let me introduce myself I am a 22 year old engineering student at the university of Illinois.  I have been lurking on this site for several years, probably just after it was created.  Recently my dad bought a 73 coupe that is very abused.  I intend to help him restore it this summer and some weekends.  check this link for some pictures.

https://netfiles.uiuc.edu/decraene/www/index.htm

Now for my question.  The car has a bare block that is a two bolt main.  How much power can a two bolt block reliably handle.  I have heard wild opinions both ways and figured I would fish for a few more.

decrepid1338406.6184143519


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4 bolt main

Posted: 2/23/05 3:09pm Message 2 of 10
daveb12
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KERNERSVILLE, NC - USA
Joined: 1/13/2004
Posts: 1355
Vette(s): 1968 L-71 convertible
Properly built, the 2 bolt will give you everything you need. Unless you plan on turning very high RPM's, like over 8 grand, the 2bolt will be fine.


4 bolt main

Posted: 2/23/05 3:21pm Message 3 of 10
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
Agreeded.  For a street car the 2 bolt is fine.  It will handle the HP you want.


4 bolt main

Posted: 2/23/05 3:32pm Message 4 of 10
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans

a properly balanced 2 bolt isnt anymore likely to blow than a properly balanced 4 bolt..

if in any doubt..  if you take a block into a machine shop they can drill the holes and tap them..  then all you need is 4 bolt caps..




4 bolt main

Posted: 2/23/05 3:47pm Message 5 of 10
daveb12
Former Member
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KERNERSVILLE, NC - USA
Joined: 1/13/2004
Posts: 1355
Vette(s): 1968 L-71 convertible
[QUOTE=cthulhu]

a properly balanced 2 bolt isnt anymore likely to blow than a properly balanced 4 bolt..

if in any doubt..  if you take a block into a machine shop they can drill the holes and tap them..  then all you need is 4 bolt caps..

[/QUOTE]

Or, if you want to go all out. splayed caps!




4 bolt main

Posted: 2/23/05 5:11pm Message 6 of 10
decrepid13
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Lisle, IL - USA
Joined: 6/18/2002
Posts: 125
Vette(s): 1973 coupe Under Construction
thanks for the info, thats about what I thought, its nice to hear it from people who konw what they're talking about


4 bolt main

Posted: 2/24/05 6:04am Message 7 of 10
chesh
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Edgewood, KY - USA
Joined: 10/26/2003
Posts: 339
Vette(s): 1981, Black/Black, Engine bumped to about 400HP.Ext/int mostly stock.
What are splayed caps?  I've heard the term before, but never with a description or picture. 


4 bolt main

Posted: 2/24/05 8:43am Message 8 of 10
smoke-m
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baytown, TX - USA
Joined: 4/21/2004
Posts: 160
Vette(s): 1979 maui blue/doe skin, fuel injected 383, 6-speed manual, hooker sidepipes, 3.90 gear
splayed caps have 4 bolts but the outside 2 bolts are drilled at an angle giving the caps added strength.


4 bolt main

Posted: 2/24/05 8:58am Message 9 of 10
chesh
Former Member
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Edgewood, KY - USA
Joined: 10/26/2003
Posts: 339
Vette(s): 1981, Black/Black, Engine bumped to about 400HP.Ext/int mostly stock.
Thanks smoke-m.  Awesome looking engine compartment!  I am incredibly intrigued by the valve covers.  I'd just like to see the rockers in operation as the engine runs.  Even at idle I assume they are moving so fast you really can'y see much?


4 bolt main

Posted: 2/24/05 11:31am Message 10 of 10
Tumarr
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Batavia, IL - USA
Joined: 3/27/2003
Posts: 622
Vette(s): 496 big block, Dragvette 6 link, 12 bolt IRS conversion, Going for fastest Vette IRS E/T
well I ve ran my engine with the valve covers off before, and its cool to see them cycle. You can see the individual rockers go up and down. I think it would be neat to make some covers like that, since they are not sold any more.


in Forum: C3 Engines


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