j par
Well-hung Member
I really don't know that it matters but it seems to be the latest question like there's some validity to what year they were made or how long they've been sitting on the shelf I guess..
My home inspection of Speedmaster heads
- Thread starter 318willrun
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The set I picked up used, are several years old. Their guides were fine and the seats are still in them.
Some early SBC an SBF ones I saw had soft guides, they were also oddball sizes on the od. Had to order them from PEP. Had to be careful when removing them with the air driver or the would mushroom. All the small block Mopar ones I have seen have had .545 od guides which are an easy to get size, haven't seen any soft ones in them.
j par
Well-hung Member
I think what's got people asking the question is that there was supposed to be some kind of inconsistency in quality years ago.. worried that if they had some older heads that they wouldn't be the same quality as something newer..
Just internet Boogeyman stuff...
PRH
Well-Known Member
The BB Victor copies I fixed a couple years ago had the oddball guides in them.
All 16 were shot.
The guides were absolutely a problem with ProComp heads for a while.
All 16 were shot.
The guides were absolutely a problem with ProComp heads for a while.
j par
Well-hung Member
Only thing I could remember from the non-CNC'ed I thought was 250 at .500?
Just wanted to tell everybody.
Merry Christmas.
Hope you're all doing fine.
Merry Christmas.
Hope you're all doing fine.
PRH
Well-Known Member
I got them from SI....... they’re like .507 OD.
What's happening at .300-.400?
No idea. Heads are getting a decent valve job, and then we'll have a discussion about what the next move is, if anything.
I've already decided to finish my roller cam upgrade so they're getting new springs/keepers/retainers.
PRH
Well-Known Member
What’s happening is....... for a ported head with a 2.02 valve at those lifts........ they kinda suck.
From a flow standpoint, the valve job sucks, and the throat is too big.
There is essentially no top or bottom angle....... so there isn’t a properly shaped transition from the bowl out around the valve and past the seat, so the port can’t move any air until you get the valve way off the seat and out of the way.
For the typical street/strip guy........ running these ootb isn’t going to be the magic you were hoping for.
They have potential...... as seen by the .600+ flow numbers.
But they’re not anything special ootb.
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It's not good, but Dwayne has confidence there's a lot in the valve job, so we're going to see where that gets us and go from there.
Do you have any pictures of the shortside with a valve out looking up at the shortside like it’s a dam or waterfall
I don't. Heads are up at PRH getting flowed, valve job and flowed again. I made an album of all the pictures I have.
https://photos.app.goo.gl/DfJ93fWS7Ys4w41k9
yellow rose
Overnight Sensation
Just for fun, what year were your heads?
Same as everyone else's, 2014.
Very disappointing #'s. A valve job and some cleanup should bring the #'s up some.
I guess 250 at .500 is wishful thinking with the standard SM head. Get your grinder out
j par
Well-hung Member
I'm not worried about these numbers whatsoever LOL.. just interesting to look at and talk about.. I don't think I'm going to lose anything by putting these heads on except for weight...Very disappointing #'s. A valve job and some cleanup should bring the #'s up some.
I guess 250 at .500 is wishful thinking with the standard SM head. Get your grinder out
skrews
Well-Known Member
Just looking at these things I'd love to try a 2.055 valve with a 50° seat. I'd also get a .050 shorter length so I could sink the valvejob a bit so as to get a wide top cut and not have geometry nightmares.
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