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 Post subject: Rate my bbc engine combo
 Post Posted: Wed Feb 10, 2010 4:15 pm 
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Amateur Racer

Joined: Sat Dec 10, 2005 7:22 pm
Posts: 163
Location: Orangeburg, SC
468ci bbc
1050 holley dominator carb
team g intake with 1inch spacer
proform 1.7 rockers
dart iron eagle 345 119chamber 2.300/1880 valves
doug herbert solid roller cam .703/.708 lift 305/314 dur 108 ls
doug herbert solid roller lifters
ross 36cc dome pistons on 6.385 " h-beam rods
stock crank

trans th400/5000 stall
4.56 gears
mt 28x10.5w slicks

hope to go 6.90 in the 1/8 on motor in a gutted malibu wagon :D

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1979 Malibu
406 6 inch rods kb .150 dome pistons
hurricane intake 750 dp
doug herbert solid cam 290/300 528/552
chevy 461 heads
NOS Cheater system
Th350, 3500 converter
4.56 gear ratio
28 inch M/T ET Streets


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 Post Posted: Wed Feb 10, 2010 6:14 pm 
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Frequent Racer
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Joined: Wed Feb 25, 2009 8:22 pm
Posts: 616
Location: romeoville il
i hope you have aftermarkit pistons and not stock replacements, that big of a lift it will hit pistons.

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 Post Posted: Wed Feb 10, 2010 7:55 pm 
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Posts: 163
Location: Orangeburg, SC
toxicbu wrote:
i hope you have aftermarkit pistons and not stock replacements, that big of a lift it will hit pistons.


they are ross part#82012

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1979 Malibu
406 6 inch rods kb .150 dome pistons
hurricane intake 750 dp
doug herbert solid cam 290/300 528/552
chevy 461 heads
NOS Cheater system
Th350, 3500 converter
4.56 gear ratio
28 inch M/T ET Streets


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 Post Posted: Wed Feb 10, 2010 9:17 pm 
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Posts: 2451
Location: Crete,IL
If it doesn't go 6.30's there's something wrong with it. :D Although, in my opinion, the heads are too big. Still should go better than 6.90's. Lee

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 Post Posted: Wed Feb 10, 2010 9:36 pm 
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Amateur Racer

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Posts: 163
Location: Orangeburg, SC
racecar77 wrote:
If it doesn't go 6.30's there's something wrong with it. :D Although, in my opinion, the heads are too big. Still should go better than 6.90's. Lee


so it would be faster with the dart 308 int runner 119 chamber 2.250/1.880 valves

_________________
1979 Malibu
406 6 inch rods kb .150 dome pistons
hurricane intake 750 dp
doug herbert solid cam 290/300 528/552
chevy 461 heads
NOS Cheater system
Th350, 3500 converter
4.56 gear ratio
28 inch M/T ET Streets


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 Post Posted: Wed Feb 10, 2010 10:40 pm 
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Posts: 2451
Location: Crete,IL
In my opinion, yes. Or even a set of Dart 320's maybe. Mine has 290cc heads with 2.19 1.88 valves, 850 carb, bigger cam (lift), less compression, and has been 6.43 (1/8th) and 10.17 (1/4). Lee

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 Post Posted: Wed Feb 10, 2010 11:41 pm 
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Frequent Racer
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Joined: Mon Oct 05, 2009 12:40 am
Posts: 605
Location: north judson indiana
I would consider going to a better brand of rocker like a crane,comp or scorpion ive seen those proform fail on less cam and spring pressure before.Just my .02

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81 malibu
355
unported vortec heads shaved to 56 cc
solid flat tappet crane cam
stock rods and crank w arp
best of 12.511 na/11.519 w 125 shot

Hopefully gettin a 6.0 by summer!!


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 Post Posted: Thu Feb 11, 2010 9:10 am 
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Joined: Mon Apr 12, 2004 5:57 pm
Posts: 2749
Location: Roxana, IL
Heads are too big. I ran a set of Dart 325's on my 468 that had a little more cam in it and it didn't pick up much over the 781's. More I think because of weight. I always thought my combo would have been better suited by some bmf 310's or afr 305/315's.

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83 Monte Carlo SS, bbc, PTC converter, 10" tires
1.41 9.47 145.6 shakin it down
82 Cutlass 10.17/133 blow thru
http://www.ultimatespeedandmachine.com/
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 Post Posted: Thu Feb 11, 2010 9:31 am 
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Amateur Racer

Joined: Sat Dec 10, 2005 7:22 pm
Posts: 163
Location: Orangeburg, SC
racecar77 wrote:
In my opinion, yes. Or even a set of Dart 320's maybe. Mine has 290cc heads with 2.19 1.88 valves, 850 carb, bigger cam (lift), less compression, and has been 6.43 (1/8th) and 10.17 (1/4). Lee


i also have a comp solid roller cam .748/.710 lift 311/315 dur 110 lc 5000-7500 rpm would it help if i ran this cam

_________________
1979 Malibu
406 6 inch rods kb .150 dome pistons
hurricane intake 750 dp
doug herbert solid cam 290/300 528/552
chevy 461 heads
NOS Cheater system
Th350, 3500 converter
4.56 gear ratio
28 inch M/T ET Streets


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 Profile  
 
 Post Posted: Thu Feb 11, 2010 10:05 am 
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Joined: Sun Feb 05, 2006 12:10 am
Posts: 219
Location: Fayetteville, NC
Heads may be too big but they may kill enough bottom end to hook the thing. You've got a small tire, a lot of gear, and a 2.48 first gear ratio. Start saving for a glide! The engine combo sounds pretty stout. Like others said--if it hooks you should be 6.40 or better.

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Mike Allred
83 El Camino footbraker


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 Post Posted: Thu Feb 11, 2010 11:17 am 
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Amateur Racer

Joined: Sat Dec 10, 2005 7:22 pm
Posts: 163
Location: Orangeburg, SC
thanks guys for all the info/help

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1979 Malibu
406 6 inch rods kb .150 dome pistons
hurricane intake 750 dp
doug herbert solid cam 290/300 528/552
chevy 461 heads
NOS Cheater system
Th350, 3500 converter
4.56 gear ratio
28 inch M/T ET Streets


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 Profile  
 
 Post Posted: Thu Feb 11, 2010 12:50 pm 
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MalibuRacing Junkie
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Joined: Wed May 21, 2003 11:19 am
Posts: 4237
Location: Westminster, MD
What's the duration @ .050 on both cams?

Also, what does the static compression work out to? My guess is around 11 or 11.5 to 1 at best.

I also agree the 345 runner heads are way too big, that coupled with low-ish compression and it's not gonna perform to it's potential, but should go 6.90's.

My old BMF 310 headed 461 bbc went as quick as 9.48 @ 141 and 5.95 in the 1/8 naturally aspirated at 3400 lbs.

Performance comes down to a well matched combination and your proposed deal is lacking in matched components.


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 Post Posted: Thu Feb 11, 2010 1:28 pm 
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Posts: 163
Location: Orangeburg, SC
10secBu wrote:
What's the duration @ .050 on both cams?

Also, what does the static compression work out to? My guess is around 11 or 11.5 to 1 at best.

I also agree the 345 runner heads are way too big, that coupled with low-ish compression and it's not gonna perform to it's potential, but should go 6.90's.

My old BMF 310 headed 461 bbc went as quick as 9.48 @ 141 and 5.95 in the 1/8 naturally aspirated at 3400 lbs.

Performance comes down to a well matched combination and your proposed deal is lacking in matched components.


compression 11 to 1
dougherbert 270/279 dur @.050
comp 274/284 dur @.050

_________________
1979 Malibu
406 6 inch rods kb .150 dome pistons
hurricane intake 750 dp
doug herbert solid cam 290/300 528/552
chevy 461 heads
NOS Cheater system
Th350, 3500 converter
4.56 gear ratio
28 inch M/T ET Streets


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 Profile  
 
 Post Posted: Thu Feb 11, 2010 10:41 pm 
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Amateur Racer

Joined: Sat Dec 10, 2005 7:22 pm
Posts: 163
Location: Orangeburg, SC
will it help if i add a 200 shot of nos to this combo to make up for the heads being to big :D

_________________
1979 Malibu
406 6 inch rods kb .150 dome pistons
hurricane intake 750 dp
doug herbert solid cam 290/300 528/552
chevy 461 heads
NOS Cheater system
Th350, 3500 converter
4.56 gear ratio
28 inch M/T ET Streets


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 Profile  
 
 Post Posted: Tue Feb 16, 2010 12:24 pm 
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Amateur Racer

Joined: Sat Dec 10, 2005 7:22 pm
Posts: 163
Location: Orangeburg, SC
Twister79 wrote:
will it help if i add a 200 shot of nos to this combo to make up for the heads being to big :D


will the nitrous help me [-o<

_________________
1979 Malibu
406 6 inch rods kb .150 dome pistons
hurricane intake 750 dp
doug herbert solid cam 290/300 528/552
chevy 461 heads
NOS Cheater system
Th350, 3500 converter
4.56 gear ratio
28 inch M/T ET Streets


Top 
 Profile  
 
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