Just some quick thoughts while waiting for Test and Tune 
Speedmaster heads are on and running.....
- Thread starter 318willrun
- Start date
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doug 371
Well-Known Member
Cool...I've been bumping into some of your head vids from 5 years ago...
dartfreak75
Restore it, Dont part it!
Awesome video as always thanks for sharing
Thanks for sharing. What was ur et b4? How much of a gain do u expect? Kim
Thanks! Cool shot of midway point!
Yessiree I want to cruise Route 66 some year. Kim
threefortyduster
2XSM
Did you actually weigh the heads vs. the iron heads to get the 50 pound number or is that an educated guesstimate?
My CNC heads weigh 23lbs each bare, I never weighed the valves, retainers springs, seals and locks. But 6-8 lbs for them seems pretty close. He may be going off the shipping weight. Kim
Another goodun'
Thanks, man!
Thanks, man!
My complete un modified heads weigh 27.3# Cast heads weigh around 55# so almost 100# weight savings.
threefortyduster
2XSM
Wow. I knew the aluminum heads cut a bunch, but that's crazy. I have a set of complete X heads sitting here, might just have to weigh them to compare. Thanks!
FYI cast bb heads if I remember right are only a few lbs more than the Sb cast heads. Kim
That would be 55 lbs savings. 2 alum heads weigh the same as 1 cast head. Kim
Dagnabit! I type too slow! I got treed....
Ran consistent 13.3's in decent air. I would guess it'd run high 12's now.
Yep, weighed them. It's actually in my "home inspection" video. About 52 lbs difference for the pair.
threefortyduster
2XSM
Just weighed my assembled X head minus rockers. 46.6 pounds. Now I just need to order the aluminum heads and hide them from my wife.
This is gonna be fun!
Agree! We all know these heads would love more cam, with a good converter, and better gears. But I just gotta see what they are worth as it sits
So u must think by ur butt Dyno their was a marked improvement of a 1/2 second. That will be great if it is. Kim
My seat-of-the-pants dyno says "Hands down, No doubt faster". I also have markings out of town and I gained MPH in that same stretch compared to before. I would guess 4 tenths, but that's just my guess. That would be a 12.9
Sweet. I wish u luck. Kim
PRH
Well-Known Member
Lookin forward to the track results!!
I like that you didn’t change anything else on the combo.
I think the 13.3’s out of it with the stock heads, tiny cam, and 2.94’s was fantastic.
Anything beyond that is just a bonus........ and if it actually dips into the 12’s...... that’ll really be something.
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