Me and my father got a Dart 69 440 together which we bracket race with.
Last winter we changed the old high compression ~12.5;1 452 heads to a pair of aluminum heads ~10.6;1. We gained a little in the top end and lost in the bottom.
more info
440 0.030 over
Alu heads 84cc, 2.14, 1.81, 210cc Intake
850cfm Holley carb
Solid lifter 650lift, 320dur
727, 8" ATI 5000 stall,TB, 31*12 rears
Dana 60 w spool, 4.88
Holley blue fuel pump.
Revs a lot crossing the 1/4mile line
Engine peaked at ~560hp at ~6300rpm in the bench.
With the 452 heads it was 537hp at 6100.
From 4800rpm the alu heads were better all the way.
Here's a clip from this summer
Best ET for us 10.52s
Now where thinking about what to upgrade next. The intake is an old Weiand 7512 intake and planned to replace it with something better. We already have a RPM 7193 intake from another engine we could try and use.
Looking at info from sites like this: #4---Ported Intake Manifolds UPDATED 08/27/2007
And an old chart from mopar muscle mag test from 2002.
Intake manifold Hp / Tq Avg Hp/Tq
(1) Edelbrock Victor : 637@6400 / 593@4700 568/570
(2) Holley Street Dominator : 636@6200 / 598@5000 573/571
(3) Mopar M1 (single plane) : 629@6100 / 589@4900 564/567
(4) Edelbrock TM7 : 618@6200 / 602@4900 569/568
(5) Edelbrock Torker 2 : 627@6300 / 593@4900 565/563
(6) Edelbrock Torker (orig) : 605@5500 / 608@4700 565/566
(7) Edelbrock Performer RPM : 610@6200 / 590@4000 556/555
(8) Edelbrock CH4B : 607@6400 / 573@4000 545/544
(9) Weiand team G (Track R) : 597@6300 / 569@4900 540/534
(10) Weiand action plus : 597@6300 / 564@4000 537/536
(11) factory 70-71 iron : 575@6200 / 581@4000 534/535
The Victor and Holley Street D (Strip Dominator the same?) seems like the best options.
Torker II and Mopar M1 as 2nd best.
RPM is a little bit away but maybe some porting on a RPM intake could help?
I asume a 950 carb could help a little also.
A friend thought we should change the 4.88 gears to 4.56 or 4.10s to lower the revs and go faster.
What is this forums general idea about the Weiand 7512 intake? It seems like an really old intake dated back to 1974.
And what other tweeks do you think can get us closer to the 9?
