Re: Another street/strip 440 rebuild
[Re: mopar67440]
#1638761
08/04/14 01:59 PM
08/04/14 01:59 PM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Quote:
I already have the 906's w/ heavy springs/dampers. The aluminum heads are just a little rich for my blood at the moment.
Also, the engine ran strong with the 700cfm right up to 6500. At the suggestion of a friend, I tried both a 750 & 850, and after tuning them both, I found the larger carbs were not as responsive, and there was really no diff in the et's, so I went back to the 700.
Iron heads with todays fuel and that compression ratio may not be compatable If you have to retard the timing or run the motor fatter than best performance to keep it from detonation your not getting the best performance from the parts, are you I would lower the compression to no more than 9.5 to 1 so I could tune it for best performance As far as your motor not liking the bigger carb. that is a abnormality with all the 440 I've tuned and tested, I would bet money that you had a fuel restriction in the car limiting the fuel supply at WOT on both carbs My reasoning for saying this is I have tested carbs. from 600 CFM to a 1050 Dominator on the same motor, one intake swap for the Dominator carb. and the car would pick up with each larger carb. All the 4150 carbs, 600 DP Holley to a Holley 950 HP DP, where tested on the same intake and jetted for best performance I even tested a BG Holley 750 stage three modded carb. that flowed 920 CFM and it ran better than any of the stock 4150 Holleys jetted Good luck on your build Think twice, act once Edit, I should have read pages 2,3 and 4 before posting this post To late for my Good luck BTW, a colder spark plug will help control detonation. I like to set my BB total timing at 34 to 36, depending on which compression ratio and fuel. I do shorten up the advance so I can get 14 to 18 degrees at idle and then have the timing come all in by 2000 to 2500 RPM.
Last edited by Cab_Burge; 08/04/14 02:18 PM.
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Re: Another street/strip 440 rebuild
[Re: mopar67440]
#1638762
08/04/14 07:02 PM
08/04/14 07:02 PM
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Joined: Jan 2003
Posts: 75,004 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,004
U.S.S.A.
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Quote:
Next is 6 qrt pan, windage tray, pickup, and HV pump. Also ordered the Billet rear main seal kit from Mancini which I hear never leak.
High volume pump , as is the billet rear cap , is a waste of money , not needed and it's overkill.
If you have a stock crank best money spent is on a ROPE SEAL from BEST gasket , 383 I fired up last weekend does not leak on drop.
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Re: Another street/strip 440 rebuild
[Re: viperblue72]
#1857389
06/26/15 01:49 PM
06/26/15 01:49 PM
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Joined: Jun 2014
Posts: 41 MA
mopar67440
OP
member
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OP
member
Joined: Jun 2014
Posts: 41
MA
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Just wanted to update everyone on the rebuild.
Started the engine Saturday, broke in the 509 cam, dumped the oil, and now have about 5 hrs and 75 miles on it...mostly hard accel & deaccel under 5k rpms to seat the rings. So far so good.
Cooling was a big concern to head of detonation w/ an estimated 10.5:1 CR & 906 cast heads,, so I found a 1969 2949054 max cool 3 core radiator w/ shroud and 7 blade 18" x 2.5" viscous fan. Running a 185 degree, high flow therm, and she's running nice and cool, even with the Coan 11" 2600 stall converter & 3:91 gears.
With Sunoco 93, I set initial timing to 14, w/ 22 mechanical for 36 total by 3000 rpm (I may want to revisit this). Autolight 85's are gapped at 0.045" using a Mallory Hyfire ignition w/ Promaster coil and sidewinder wires.
Carb is a 4150 (700cfm) with 74 jets prim/84 sec (may also want to revisit this with a chassis dyno)
Decided to pull all 8 spark plugs this morning to inspect. I included a pic of cycl 1 (all 8 are close to the same). I'm pretty much just staying on the carb primaries at speeds of 30-50mph.
Would love some feedback on the spark plug. I'm thinking they look pretty good...maybe on the lean side, but I'm by no means an expert at plug reading.
Last edited by mopar67440; 06/26/15 06:23 PM.
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