How much power can 2-Bolt Mains hold?
10-17-2006, 03:24 PM
#5
I was at 480 rwhp the first time I got this 383" going. Never sprayed it, but was a nervous wreck the whole time. Put splayed steel caps on it the next winter. Didn't expect it to make that much, or I would have put them on fist time.
Btw Bret, do you have any customers going to the GMHTP thing at E-Town? If so, are you coming?
Btw Bret, do you have any customers going to the GMHTP thing at E-Town? If so, are you coming?
10-17-2006, 05:42 PM
#6
Probably doesnt count, but... my big block chevy put out 680hp on its two bolt with a calies stealth crank no problem, before that i had a 2 bolt 468ci complete with a stock cast crank that ran 10.20's (shoulda et'ed better had lousy suspension, trapped 136) shifted at 7200rpm's for two years of constant racing and street car duties in a full weight chevelle (both N/A). sorry I couldnt help but chime in, Ive also seen sb fords in mustangs puke there blocks in half trying to run high 11s.
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10-17-2006, 08:03 PM
#10
most block breakage has to do with with a less then perfect crank and poor architecture of the block contributing to the block flexing. the higher nickel content of older blocks also help. most older blocks came with 2bolts because they were in engines that maxed out at 4000rpm and about 200hp. anything more then that would tend to be a 4bolt. now i am still learning about this new stuff but i wouldn't be afraid of 500+hp on 2bolts if they were studs and i had a good crank.
and ps, arn't those ford blocks skirted? that is a big plus in their favor.
and ps, arn't those ford blocks skirted? that is a big plus in their favor.
10-17-2006, 08:25 PM
#11
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I'm running 500+ fwhp with 2-stud mains and a Scat 4340 crank with the mains being the weak link.
Don't quote me but IMO 600 fwhp for a drag motor and 500 fwhp for a circle track motor would be the upper limits at the expense of reduced main bearing service.
Dean
Don't quote me but IMO 600 fwhp for a drag motor and 500 fwhp for a circle track motor would be the upper limits at the expense of reduced main bearing service.
Dean
10-18-2006, 12:11 AM
#13
There is always somebody who has done this or seen that.... they are either lucky or on borrowed time. There is always some guy who goes faster with a set of heads than anyone else, just like computers some guy overclocks a chip more than anyone else, or women some goofball gets some hottie because she thinks Bob Saget is hot. There are always these things but the MAJORITY of guy who do this do not get the same results.
Bret
Bret
10-18-2006, 12:28 AM
#14
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Hmm What I always thought and was told was 2bolts were in cars due to the high reving and power, where as 4bolts were in trucks for the strain from pulling and driving more weight around. Afterall, a truck is going to stay under 4000rpms alot more than a muscle car is.
I'm all for being proved wrong, I'm just going by what people have told me and what, to me, makes sense.
I'm all for being proved wrong, I'm just going by what people have told me and what, to me, makes sense.
10-18-2006, 03:17 AM
#15
Well GM also wanted IRON heads for the GenIII 6.0L when it first came out. Guess what they didn't use them more than a year.
Trucks put more strain on blocks since they usually can be loaded harder for longer. A 10,000lbs trailer going on I-70 from Denver to Salt Lake City is going to be under a lot more strain and Torque for longer than a 300hp Camaro would be going thru the gears for 14 sec at a pop.
RPM will kill a 2 bolt faster than anything. The problem is you can't sustain lots of RPM under load for a long time in a 3500lbs 300hp car legally where you can sustain lots of load pulling that trailer up and down 10,000 foot mountains.
Bret
Trucks put more strain on blocks since they usually can be loaded harder for longer. A 10,000lbs trailer going on I-70 from Denver to Salt Lake City is going to be under a lot more strain and Torque for longer than a 300hp Camaro would be going thru the gears for 14 sec at a pop.
RPM will kill a 2 bolt faster than anything. The problem is you can't sustain lots of RPM under load for a long time in a 3500lbs 300hp car legally where you can sustain lots of load pulling that trailer up and down 10,000 foot mountains.
Bret
10-18-2006, 05:55 AM
#16
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Originally Posted by SStrokerAce
RPM will kill a 2 bolt faster than anything.
Bret
If you are making 500+ fwhp on a 2-bolt I would certainly want to keep the R's under 6500.
Dean
10-18-2006, 08:58 AM
#18
who here has lost/worn main bearings in there car? that was a result of clamping force failure loss that didnt see debris through the oil pump first? I havent seen a main cap/fastener fail but i have seen blocks converted to 4 bolts webbing crack due to removed material. I would feel better spending my money on ballanced reciprocating parts,ARP main studs and good valve springs. GM could pass on the 4 bolts and over engineer the big end of the rod on trucks. Ive been told I look like Bob Sagets homely brother.
10-18-2006, 09:49 AM
#19
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If I remember correctly the Chevrolet Bible (I call it, back in the day) states the a 2-bolt main block is limited to 500hp.
I have to agree with the above,on the components being used. It is hard to compare the newer blocks to the older blocks. The main reason the alum blocks are 6-8 bolts mains is due to alum is weaker that cast. Plus the alum block have to be webbed more for strenght. Just thought I would point that out, not trying the start anything.
My brother race car has a 468 BB and has a stock steel crank and is 2-bolt main. He did install the arp stud kit. He had it dyno'd about 4 years ago & it produced 668HP and the rear wheels. It still runs today with no problems. It is shifted at 6800 RPMs
I have to agree with the above,on the components being used. It is hard to compare the newer blocks to the older blocks. The main reason the alum blocks are 6-8 bolts mains is due to alum is weaker that cast. Plus the alum block have to be webbed more for strenght. Just thought I would point that out, not trying the start anything.
My brother race car has a 468 BB and has a stock steel crank and is 2-bolt main. He did install the arp stud kit. He had it dyno'd about 4 years ago & it produced 668HP and the rear wheels. It still runs today with no problems. It is shifted at 6800 RPMs
10-18-2006, 10:38 AM
#20
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Originally Posted by Formula350
But we're making Rwhp, not Fwhp 
You're not a converted ricer are you? O_O lol
You're not a converted ricer are you? O_O lol