MOPAROFFICIAL
Oogliboogli
Okay they're done. Update coming ..
Speedmaster magnum inspection w/Justin
- Thread starter MOPAROFFICIAL
- Start date
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MOPAROFFICIAL
Oogliboogli
Bare with me.
Picked up the heads.
Have not flowed them, yet. I took pics, first.
I'm setting myself up so I have a few things I can test 'back-to-back' and not have to test, stop, do work, then go back and test.
I decided to work one port, moderately...but let me explain. The as cast vj on these leaves a ledge around the valve ..and the new one didn't rid that. I sent them for guide resize and had a vj laid while they were there. Some use a chamber cut to sweep around the valve.....i use a stone...they used nothing and apparently didn't care about the ledge...none the less that's gonna flow for **** like that in the pre .400 lift range. So because of that..i know what is gonna happen with an as cast right off the bat.. So to save time... i worked another intake port like i said and i dropped a 15 degree 2.125" stone that i cut a tiny 45/60 just on the outer edge to round it and then un shrouded the intake valve and rid that ledge...then i dropped a stock 1.94 dummy valve in and used the grinder with a tear drop pointed carbide bit to blend the stone cut. Below are pics of the after valve job and then the bowl/ssr blend and stone unshroud and blend.
I will have it on the bench for a 'as cast' test and the follow up of the work I've done tomorrow. Pics are with my phone. Notice the 2 angle and radius on the exhaust, i really like seeing that. The intake is 4 angles and the un shroud radius.
I think it will be night and day between the 2. Guesses welcome.
View attachment 1715665284
Picked up the heads.
Have not flowed them, yet. I took pics, first.
I'm setting myself up so I have a few things I can test 'back-to-back' and not have to test, stop, do work, then go back and test.
I decided to work one port, moderately...but let me explain. The as cast vj on these leaves a ledge around the valve ..and the new one didn't rid that. I sent them for guide resize and had a vj laid while they were there. Some use a chamber cut to sweep around the valve.....i use a stone...they used nothing and apparently didn't care about the ledge...none the less that's gonna flow for **** like that in the pre .400 lift range. So because of that..i know what is gonna happen with an as cast right off the bat.. So to save time... i worked another intake port like i said and i dropped a 15 degree 2.125" stone that i cut a tiny 45/60 just on the outer edge to round it and then un shrouded the intake valve and rid that ledge...then i dropped a stock 1.94 dummy valve in and used the grinder with a tear drop pointed carbide bit to blend the stone cut. Below are pics of the after valve job and then the bowl/ssr blend and stone unshroud and blend.
I will have it on the bench for a 'as cast' test and the follow up of the work I've done tomorrow. Pics are with my phone. Notice the 2 angle and radius on the exhaust, i really like seeing that. The intake is 4 angles and the un shroud radius.
I think it will be night and day between the 2. Guesses welcome.
View attachment 1715665284
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Nice work there, Buckwheat.
MOPAROFFICIAL
Oogliboogli
Thanks Stymie!
I can see a Buckwheat. My sister actually went to school with a Buckwheat. Had it on his driver's license. But WTH would name their kid Stymie? WTF kinda name is that? LOL And Farina? LOL
Bobzilla
Well-Known Member
With that little bit of work, once all throats look at least like that, I would be happy running those on my truck.
Thanks for showing this and keep up the good work.
MOPAROFFICIAL
Oogliboogli
MOPAROFFICIAL
Oogliboogli
No good news here...lol
Well, there is and there isn't... not bad, but lacking a hair. As cast they are garbage.
As cast 1.94 11/32 valve @28 w/4" bore adapter.
Lift-cfm
.100- 47
.200- 98
.300- 147
.400- 181
.500-196
.600- 226
Nutshell, They flow like a 318 head ootb up to .400 lift.
After the work i did in the last post +pinch and straight wall.
Lift-cfm
.100-63 +16
.200-119 +21
.300-178 +31
.400-212 +31
.500-246 +50
.600-254/257 bouncy/turbulent +26-28
Conclusion Now i have fiddle fk them more than i wanted. The chamber is still smothering...its a 1.94... though it's not a 2.02, it should still do about 10 cfm better .200-.400 lift. Imo
What will I do next you might be asking yourself....well... a 75 degree lower angle , lower the ssr height from the window side and work the chamber nearest the cyl wall for starters. I don't think the raised fin between the int/exh on the closed side is helping any either... The chamber can be opened more at the far side of the bowl right off the seat/15*.
This head ootb would just kill the perfomance bolted it on as is. Looks are decieving , and even a decent looking ssr can get road blocked by a intrusive chamber. Nothing new i guess. They come with buried valve seats. If they could come up with or offer a cnc it would be the only way they'd be bought!
Well, there is and there isn't... not bad, but lacking a hair. As cast they are garbage.
As cast 1.94 11/32 valve @28 w/4" bore adapter.
Lift-cfm
.100- 47
.200- 98
.300- 147
.400- 181
.500-196
.600- 226
Nutshell, They flow like a 318 head ootb up to .400 lift.
After the work i did in the last post +pinch and straight wall.
Lift-cfm
.100-63 +16
.200-119 +21
.300-178 +31
.400-212 +31
.500-246 +50
.600-254/257 bouncy/turbulent +26-28
Conclusion Now i have fiddle fk them more than i wanted. The chamber is still smothering...its a 1.94... though it's not a 2.02, it should still do about 10 cfm better .200-.400 lift. Imo
What will I do next you might be asking yourself....well... a 75 degree lower angle , lower the ssr height from the window side and work the chamber nearest the cyl wall for starters. I don't think the raised fin between the int/exh on the closed side is helping any either... The chamber can be opened more at the far side of the bowl right off the seat/15*.
This head ootb would just kill the perfomance bolted it on as is. Looks are decieving , and even a decent looking ssr can get road blocked by a intrusive chamber. Nothing new i guess. They come with buried valve seats. If they could come up with or offer a cnc it would be the only way they'd be bought!
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Awesome! Thanks for the update and taking the time to do the work!
MOPAROFFICIAL
Oogliboogli
No problem. If i can stop and snap pics and get a min later in the day.. i post it. Its hard when theres little time to play.
MOPAROFFICIAL
Oogliboogli
Before i do more on this one.. ill cc the int port as cast to verify if its really 179cc.
Thanks for the interest.
Thanks for the interest.
Bobzilla
Well-Known Member
From the pictures of the ports I would be surprised if they were higher than low 160s, but I have not seen one in person. Looking forward to that update.
MOPAROFFICIAL
Oogliboogli
I've seen 360 heads with ski slope 60's funnel to about a 1.75 hole do 204 cfm by .450+ lift. Lol. I figured they would suck at .100-.400 lift being buried. I was more optimistic on the peak ootb. Though s a higher lift fwiw 226 cfm is better than a factory magnum head as cast.
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Check your .400 and .500 math.
MOPAROFFICIAL
Oogliboogli
MOPAROFFICIAL
Oogliboogli
okay after some more chamber work, guide slight guide narrowing and a little 75 angle under the 60.
The new low lift.
.100-61 lost a couple.
.200-124
.300-186
.400-224
.500-246.6
.600-254-257 same issue. Short Turn finessing ahead...
Gained 5-14 cfm
The rest didn't change beyond a decimal..
The guide is tall. Cut down would be better.
What that looks like.
The new low lift.
.100-61 lost a couple.
.200-124
.300-186
.400-224
.500-246.6
.600-254-257 same issue. Short Turn finessing ahead...
Gained 5-14 cfm
The rest didn't change beyond a decimal..
The guide is tall. Cut down would be better.
What that looks like.
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MOPAROFFICIAL
Oogliboogli
Doing a deeper 75, opening the bowl more in the process. Ill post pics in a little bit.
MOPAROFFICIAL
Oogliboogli
Pic pointing out the valve job
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MOPAROFFICIAL
Oogliboogli
I got a minute to test it.
New numbers.
@28 w/4" bore 1.94 valve
.100-62-same
.200-127-same
.300-188.9-new 190
.400-221- same
.450-239-new 247
.500-252-new 256
.550-257-new 263
.600.260 turbulence.
More work to be done.
Above are new after a hair more straight wall and pinch opening.
New numbers.
@28 w/4" bore 1.94 valve
.100-62-same
.200-127-same
.300-188.9-new 190
.400-221- same
.450-239-new 247
.500-252-new 256
.550-257-new 263
.600.260 turbulence.
More work to be done.
Above are new after a hair more straight wall and pinch opening.
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MOPAROFFICIAL
Oogliboogli
Silly me, that was a 2.1/8 stone. The sticker came off. Let's try this again with a 2 1/4.
LMAO.
Nice work, Justin!
MOPAROFFICIAL
Oogliboogli
With the larger 2 1/4 stone drop, chamber work common wall straightened, pinch opened to .850, bowl blend, NO laying back of the short turn.
For reference here are the as cast w/1.94 int valve nothing done at all.
1.46
2.98
3.147
4.181
5.196
6.226
....After above work, same 1.94 intake valve
.100- 60.1
.200- 129
.300- 182
.400- 215
.500- 240
.530- 243
.550-237
.600- 221 turbulence.
For those who were wondering, they flow like an EQ at the same valve size 1.92/1.94 close enough. They flow good, good enough for a hot rod in the 430hp range and definitely good enough for my truck.
Its mostly in the chamber unshrouding.
Now I'll work the short turn.
Ill also revisit the other port and drop the bigger stone to unshroud it more,flow it etc. Chances are the previous port already in the 250/260's should jump.
I'll get some pics up.
For reference here are the as cast w/1.94 int valve nothing done at all.
1.46
2.98
3.147
4.181
5.196
6.226
....After above work, same 1.94 intake valve
.100- 60.1
.200- 129
.300- 182
.400- 215
.500- 240
.530- 243
.550-237
.600- 221 turbulence.
For those who were wondering, they flow like an EQ at the same valve size 1.92/1.94 close enough. They flow good, good enough for a hot rod in the 430hp range and definitely good enough for my truck.
Its mostly in the chamber unshrouding.
Now I'll work the short turn.
Ill also revisit the other port and drop the bigger stone to unshroud it more,flow it etc. Chances are the previous port already in the 250/260's should jump.
I'll get some pics up.
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MOPAROFFICIAL
Oogliboogli
Mirrored the chamber shape across the board. Keep in mind the pictures in this thread are works in progress and some things aren't as crucial therefore are put off toward the end.
Test tomorrow. Hella busy.
Test tomorrow. Hella busy.
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MOPAROFFICIAL
Oogliboogli
New intake flow numbers @28 w/ 1.94 valve.
.100-66.2
.200-136
.300-193
.400-230
.450-248
.500-250
.550-251
.600-245
Pinch is as big as .872... but i did some clay placement testing and found the pinch , while opening it helped to a point..itself wasn't a hindering factor... i made it smaller at one point at the floor and picked up a lot of stability and gain in mid/high lift flow. Its equalizing and transitioning the air speed.
Regardless...this is more where i wanna be with what im using them for=my 96 4x4 There is one thing ill change to the others and i believe that will have them in the 260 range just after .500 . Keep 8n mind this is a diff port than the one touching 260 already. I might bring the chamber back at the short turn a little more but I think at this point what I'm doing with them they're pretty stout.
I'll get a chamber volume stock and modified and start posting all that little bits of stuff up. I might just start another thread where I just throw it all in the first post and make it really easy to read.
Thanks to those following this..
.100-66.2
.200-136
.300-193
.400-230
.450-248
.500-250
.550-251
.600-245
Pinch is as big as .872... but i did some clay placement testing and found the pinch , while opening it helped to a point..itself wasn't a hindering factor... i made it smaller at one point at the floor and picked up a lot of stability and gain in mid/high lift flow. Its equalizing and transitioning the air speed.
Regardless...this is more where i wanna be with what im using them for=my 96 4x4 There is one thing ill change to the others and i believe that will have them in the 260 range just after .500 . Keep 8n mind this is a diff port than the one touching 260 already. I might bring the chamber back at the short turn a little more but I think at this point what I'm doing with them they're pretty stout.
I'll get a chamber volume stock and modified and start posting all that little bits of stuff up. I might just start another thread where I just throw it all in the first post and make it really easy to read.
Thanks to those following this..
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