j par
Well-hung Member
I'd sure like to see these legitimate questions get an answer... Are we going to learn anything...
Speedmaster Small block porting tips and results Part 1
- Thread starter pittsburghracer
- Start date
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PRH
Well-Known Member
I have no doubt at all that someone could ask PBR for a set of these heads
ported adequately enough to support 550hp on a bracket race type 408(or..... since he’s not a big dyno guy...... heads good enough to run 10’s)....... and he could easily do that job and make that kind of power(ET) without the heads ever seeing the flow bench.
“Flowing” the heads doesn’t actually make them better.
It’s just a measuring device.
Someone has to do the work in order for the heads to move more air.
Many guys that really know what it takes to make big power say they hardly use the flow bench anymore.
To them, the shape and size are more important than the flow number.
So no, you don’t need a flow bench to port your 2 sets of heads.
But..... you should know that since you did some porting...... and didn’t flow them.
ported adequately enough to support 550hp on a bracket race type 408(or..... since he’s not a big dyno guy...... heads good enough to run 10’s)....... and he could easily do that job and make that kind of power(ET) without the heads ever seeing the flow bench.
“Flowing” the heads doesn’t actually make them better.
It’s just a measuring device.
Someone has to do the work in order for the heads to move more air.
Many guys that really know what it takes to make big power say they hardly use the flow bench anymore.
To them, the shape and size are more important than the flow number.
So no, you don’t need a flow bench to port your 2 sets of heads.
But..... you should know that since you did some porting...... and didn’t flow them.
I’m good at derailing but being that TrickFlow cast their own heads and they are a different casting I wonder how much meat is left to work with. Slightly over 300 with a 2.02 valve and a 190cc runner. My set that flows 315-318 has a 2.08 valve and a 191 cc runner. Just thinking out loud here. Hmmmm.
I have kinda wondered if they would cast a new head or use the current casting with a different program ran through it for a more race type head. How big were the old Airwolf heads? 220? I have read they were underachievers. I would think if that guy could get that runner size without moving the rockers then Trickflow probably could but make them work.
I only knew of two Airwolf combos. One ran 10’s in I think it wa a Donali or something like that. The other was a drag week nitrous combo.
Yeah I don't think many were made. I may have spoke out of turn about their performance. Seems I read a thread somewhere and they weren't running the number. So many factors at play there though.
I was out of town for Christmas and missed many pages of information here. I had better get busy! Thanks guys for all the great information.
I have a couple Speedmaster threads to catch up on.
I have a couple Speedmaster threads to catch up on.
TT5.9mag
Two atmospheres are better than one
Read all 10 pages. PBR, thank you for sharing years of knowledge gained from real experience. This type of free information is invaluable. Also thanks to Moparofficial and PHR for adding relevant information to this thread.
You are very welcome and yes there has been lots of good help keeping this going forward and I thank you guys too. Between housework, grocery shopping, cooking and a few other duties I’ve been pretty slow moving forward. I ran out of CBD tablets, drops, and lotion that I take for my knees and low on money last month so I couldn’t order it till last week. Finally came today so I can get them tamed down some and work faster. Lol
j par
Well-hung Member
shoot me a address I'll send you a pound of the real stuff that'll make your knees wobble here in Oregon you just go down the street and buy it...
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shoot me a address I'll send you a pound of the real stuff that'll make your knees wobble here in Oregon you just go down the street and buy it... View attachment 1715445524...
Hey my Son could get me that stuff in Colorado too. Lol. I think I’ll still to the stuff I’m using for now, but thanks for the offer. Hey it’s not all fun and games over here. My pork and sauerkraut has been simmering for 14 hours now so I deboned it this morning. Time to throw in some kelby and let it soak in the juices. Harbor Freight time. Lol.
j par
Well-hung Member
My son lives in Colorado LOL.. neither one of us use it.. we're both taking up space in our state's where other people could be using it...
rednesss
Well-Known Member
I just lined up my head gaskets, looks like there is quite a bit of material that a guy could take out to unshroud the valves right?
rednesss
Well-Known Member
That was using a Fel-Pro 8553PT gasket. Which is like 4.17. But even if it is bigger than the bore, wouldn't the benefits of the extra CFM still warrant unshrounding it? The stock bore is 4.04, mine is +.030, so I've got 4.07, meaning .1 bigger, .05 on either side of the circle. .05 isn't that much of a lip. I guess it might create a little bit of turbulence. I don't know, just spitballing here.
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Brian Hafliger
Well-Known Member
I use a Victor head gasket that has a bore size of 4.080 to scribe around the chamber...
rednesss
Well-Known Member
I just measured one of the chambers, and I had .13 between the gasket and the wall, so less .05, still leaves .08 that could come out of there.
MOPAROFFICIAL
Oogliboogli
Put them on the block after its been finish honed to size...then scribe the bore to the head/chambers. Mark each head L&R So they go back on the same.
That's how you do it. You want it exact or a hair smaller than the bore...but definitely not bigger than the bore. Fyi most head gaskets are bigger , like 4.180 , than the 4-4.080 bores we use. And no, a ledge would disrupt and cause deflection into the path of the other air most near...and basically slow or crash the good air.=flows less n exhibits some turbulence perhaps
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I grabbed these a while ago, to use on my 410 (.040” over bore) to get a little more cr, assuming they would work even though they are for bigger 340 bores. Curious about the DG logo, and what the compressed thickness would be. I’ve read they are .028” thick (mine still sealed) that’s it. Can you fill me in? Thanks
MOPAROFFICIAL
Oogliboogli
Detroit gasket, also made indian head style/line. Those are coated steel?
old school they literally had gaskets that when they were compressed they had some kind of graphite layer or something.. and that would get hot spread and seal but allow the movement between the head and the block or some **** like that. Regardless, old tech but good as far as ive used them on slants.
Mopar performance farmed out for their performance parts
OU812 basically answered this.
What I’d like to add is if you use a head gasket with a bore bigger than the cylinder and then use that to make the markings on the head to unshroud the valve, there is now a portion of the head chamber larger than the bore leaving a shelf over the deck. This creates a spot for unburnt fuel and/or late burning fuel.
Un shroud the valve as much as you want to within the limits of the cylinder bore. And honestly, that’s way more than enough.
While we are talking about head gaskets, what is recommended for cast block and aluminum heads? Any gasket types not to use?
Provided you have the correct surface finish, I'm always a fan of an MLS.
1008’s on every 360 and 408 we build and I put Cometics on my 422 four years ago.
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