guess my rwhp!
03-27-2009, 08:10 PM
#21
no, 2 bolt 400 blocks are stronger than the 4 bolts.. not to mention a splayed 4 bolt main he has
i was going to go with a similar setup with my 400 block, but i think im going to make it rather mild (450hp) because im afraid of cracking the block
i was going to go with a similar setup with my 400 block, but i think im going to make it rather mild (450hp) because im afraid of cracking the block
03-31-2009, 11:36 AM
#23
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The block wil have issues befor the bottom end . I have run these blocks for 20 years and the splayed caps are stronger than the wall to head bolt area. I hope you half filled it . i say 610 on motor 717 on the dope
Last edited by pmbmax; 04-01-2009 at 12:22 AM.
04-08-2009, 08:08 AM
#25
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yea a lot of people i talk to all have the same misconception. they all call the 400s pieces of ****. mostly because they never built it right in the first place. and didnt think they needed steam holes in the block and head deck surfaces to run a 12.5:1 comp 406 as a daily driver in summer traffic. then clearance as another factor. most only buy the parts and install but never checking bearing clearances or proper ring gap.
04-09-2009, 02:15 PM
#28
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Def would've gone with at least a 4 bolt main if not an aftermarket block. Seems like you went ***** to the walls on the rest of the car...why not the block? Splayed is great but 4 bolt main is better than 2!
Um...613rwhp on motor, 865rwhp on the 250hp shot.
I have a similar setup myself...388ci, little less duration/lift/cfm/compression, but I'm adding a 300hp shot...also running through a th400+dana 60+engine driven fan so I should be robbed of a few more rwhp than you
.
Um...613rwhp on motor, 865rwhp on the 250hp shot.
I have a similar setup myself...388ci, little less duration/lift/cfm/compression, but I'm adding a 300hp shot...also running through a th400+dana 60+engine driven fan so I should be robbed of a few more rwhp than you
.
04-10-2009, 02:54 PM
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Def would've gone with at least a 4 bolt main if not an aftermarket block. Seems like you went ***** to the walls on the rest of the car...why not the block? Splayed is great but 4 bolt main is better than 2!
Um...613rwhp on motor, 865rwhp on the 250hp shot.
I have a similar setup myself...388ci, little less duration/lift/cfm/compression, but I'm adding a 300hp shot...also running through a th400+dana 60+engine driven fan so I should be robbed of a few more rwhp than you.
Um...613rwhp on motor, 865rwhp on the 250hp shot.
I have a similar setup myself...388ci, little less duration/lift/cfm/compression, but I'm adding a 300hp shot...also running through a th400+dana 60+engine driven fan so I should be robbed of a few more rwhp than you
.
it only makes sense that two straight and two angled bolts would be far harder to break than 4 straight bolts are to stretch. just a simple matter of fact.
04-10-2009, 05:37 PM
#30
Def would've gone with at least a 4 bolt main if not an aftermarket block. Seems like you went ***** to the walls on the rest of the car...why not the block? Splayed is great but 4 bolt main is better than 2!
Um...613rwhp on motor, 865rwhp on the 250hp shot.
I have a similar setup myself...388ci, little less duration/lift/cfm/compression, but I'm adding a 300hp shot...also running through a th400+dana 60+engine driven fan so I should be robbed of a few more rwhp than you.
Um...613rwhp on motor, 865rwhp on the 250hp shot.
I have a similar setup myself...388ci, little less duration/lift/cfm/compression, but I'm adding a 300hp shot...also running through a th400+dana 60+engine driven fan so I should be robbed of a few more rwhp than you
.you would have to be stupid to use a 4 bolt main 400SBC in a high rpm/horsepower car, UNLESS it is an aftermarket block with splayed 4 bolt main caps..
04-27-2009, 12:30 PM
#32
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a splayed two bolt block has the original two bolts plus two extra bolts at an angle, so how in the world is a 4 bolt better than a splayed 2 bolt??? it only makes sense that two straight and two angled bolts would be far harder to break than 4 straight bolts are to stretch. just a simple matter of fact.
it only makes sense that two straight and two angled bolts would be far harder to break than 4 straight bolts are to stretch. just a simple matter of fact.
04-27-2009, 12:33 PM
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Still wondering how much power it made...
05-02-2009, 03:57 PM
#34
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A 2-bolt converted is ALSO STRONGER!..ALSO DUE TO NOT HAVING THE EXTRA HOLES!....
....Dont argue if u dont know....
05-10-2009, 11:21 AM
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05-11-2009, 07:31 AM
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the heads were cc'd the combustion chambers were at 58cc the intake runners at 248cc. still have more material left to port into by far these heads have absolutely flowed awesome. the motor was dynoed friday night it made 773fwhp & 741 fwtq. that was with a tuned 895 cfm barry grant street demon on 116 octane with 82h jets at 28 degrees of timing spinning the motor to 6500 rpm. im going to change out the bg street demon for a 1095 cfm king demon rs, change plugs up the timing to about 32 degrees and fog a 250 hit of n20 into it and pull it up to about 7500-8k rpm and see what it makes this coming weekend
05-12-2009, 08:23 PM
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yea im pretty happy with power output vs the money i have in this build. even worst case at 15% drivetrain loss itll be cranking out 659 rwhp on motor. in a 2700 lb car that is a very brutal ride with traction.