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Jon Kaase SR71 Cylinder Heads

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Jon Kaase SR71 Cylinder Heads - Page 12 Empty Re: Jon Kaase SR71 Cylinder Heads

Post  68formalGT April 27th 2023, 12:22 am

G-Code wrote:
68formalGT wrote:G-Code, is that any better?Jon Kaase SR71 Cylinder Heads - Page 12 Screen10

Much better.  

Thanks

It says nothing about raising the port, or altering the floor on either of them to make for a better short turn.   Rats
That would be helpful. Changing that push rod pinch is certainly a winner and that would eliminate the turn before the short turn, so the floor would be more balanced.

New A460 head progress.
Last night on the flow bench we saw 450 cfm with a 2.320" valve through a 3.47" CSA  =  311 fps.  0n a 4.50" bore.

Got the flow to mellow out through it's rough section  @ .750" - 800" lift where it wants to get unstable.

We hope to maintain the smoothness and flow percentages  with a 2.380 valve. ... Work in progress

Raising the port would give the brand X guys a way to complain that it's no longer "conventional port" legal 😂
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Post  supervel45 April 27th 2023, 1:39 am

^ $4,350 for steel rocker stands, Kha Ching. Looks like you could have 8-10K in those A460's pretty quick.

I surprized nobody snagged the Thor's for $2,500 yet. They look like Gen II's and you never see them up for sale.

You will make your goal with what you have G-Code and have plenty of money left over for gas.

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Post  G-Code April 27th 2023, 12:17 pm

supervel45 wrote:^ $4,350 for steel rocker stands, Kha Ching. Looks like you could have 8-10K in those A460's pretty quick.

I surprized nobody snagged the Thor's for $2,500 yet. They look like Gen II's and you never see them up for sale.

You will make your goal with what you have G-Code and have plenty of money left over for gas.

The Thor's -  solid heads no water. And yes the Eliminators are going to be costly with those stands.


Last edited by G-Code on April 27th 2023, 12:19 pm; edited 1 time in total

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Post  G-Code April 27th 2023, 12:18 pm

[quote="68formalGT"][quote="G-Code"]
68formalGT wrote:G-Code, is that any better?[url=https://servimg.com/view/18825961

Raising the port would give the brand X guys a way to complain that it's no longer "conventional port" legal 😂

True .

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Post  supervel45 May 16th 2023, 12:36 pm

rmcomprandy wrote:
Lem Evans wrote:
nascar429 wrote:
Lem Evans wrote:It appears that the exh. side of the chamber is wider that the 4.562" bore. Is that the case?

Yes that is correct there is a slight over hang of the bore into the exh side of the chamber maybe about .020" or 0.30" or so.. i'd say a 4.600" bore would have little or no overhang into the chamber.. I did put the dowels in the deck to make sure the head was square.  

when i get a chance out of curiosity i'll do a dummy up with cam, lifters, rocker etc..and see how much exhaust valve clearance there is from the bore when the valve is open..

That being the case, a guy needs to get a head gasket that fits the chamber rather than the bore. The TFS A460 heads are the same way in that regard.

Do you think .030" offset dowel holes would be enough for a 4.390" bore using the normal 4.500" bore gaskets...?


Did you ever get a chance to look into that?

It sure looks like it would unshroud the exhaust valve from the pictures here, even on the large bore block it's on, on page 10, and center the chamber better?

I could see where it would be a lot of hassle for little gain, and would affect intake valve radial clearance.

Any other issues do doing it?

Looks like they make offset dowel pins for BBC and none for BBF.

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Post  AndyF February 5th 2024, 1:14 am

What is the typical ignition timing people are using with the SR-71 heads? I saw that Kaase was listed 27 and 28 on his dyno sheets. I've seen other dyno sheets with 26 degrees timing. I'm building a 521 with flat top Mahle pistons. Compression ratio should be around 13.2 with the pistons 0.005 in the hole. Probably use a 112 or 114 race gas.

One thing I should've paid more attention to in this thread was the head gasket discussion. I bought a set of 4.50 Cometic gaskets on the assumption that they would be fine with the 4.390 bore. Found out during assembly that the chamber requires a 4.600 head gasket, even with the smaller exhaust valve.

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Post  Dave De February 5th 2024, 9:53 am

I run SR's on my 585 with E85. Timing is at 25 degrees. I'm using the Lem Evans Cometic gasket for a 4.500 bore.
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Post  AndyF February 5th 2024, 1:01 pm

Interesting. I think we'll start at 26 or 27 on the dyno and see how it goes.

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Post  maverick172 February 5th 2024, 3:35 pm

kasse claimss the 4.5 bore mls gaskets work with the sr71
make sure you check your valve to cylinder wall clearance on the 4.39 bore ask me how i know .. i had to eyebrow all my bores as i had 8 bent exh valves.
i use the 4.6 bore head gaskets but i might try the 4.5 mls next time i have heads off.let me know what you ended up dynoing the engine at i went dish pistons too rn on street stripe . i am guessing hp around 680 so not the greatest. i have tried 26 27 28 timing track times seem to like 27 the best 10.24 @ 132mph 3380pounds with a 4.56 gear
AndyF wrote:What is the typical ignition timing people are using with the SR-71 heads? I saw that Kaase was listed 27 and 28 on his dyno sheets. I've seen other dyno sheets with 26 degrees timing. I'm building a 521 with flat top Mahle pistons. Compression ratio should be around 13.2 with the pistons 0.005 in the hole. Probably use a 112 or 114 race gas.

One thing I should've paid more attention to in this thread was the head gasket discussion. I bought a set of 4.50 Cometic gaskets on the assumption that they would be fine with the 4.390 bore. Found out during assembly that the chamber requires a 4.600 head gasket, even with the smaller exhaust valve.

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Post  AndyF February 5th 2024, 4:00 pm

Yeah Kaase says the 4.50 gasket works which is why I bought them, but the engine builder showed me how much it overhangs the combustion chamber and said he wouldn't put it together that way. So maybe it does work and maybe it doesn't. I wasn't going to argue with the engine builder so I just bought another set of gaskets. The 4.500 bore gaskets can go on another build.

Same thing with the Manley valve springs. Kaase says they work, Manley says they won't, and the guy I usually buy cams from told me they won't work. The engine builder I'm working with looked it over and said "might work, lets try it". So we're going to try it.

We checked for valve clearance and the exhaust valves seem to clear the cylinders at 4.390. I told Kaase that we were using a 4.390 bore size and they said they would put the smaller valves in them. I guess we could run into a situation where it clears fine on the engine stand but at RPM the valves start wiggling around. That would be bad.

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Post  maverick172 February 5th 2024, 4:06 pm

ya well they told me that the 4.39 bore would work i only had i think .008 of lateral cylinder wall clearance . not near enough . i eyebrowed thm and now i got .040 lateral clearance . would hate to see you wreck your engine when it can be easily clearanced although i did it before i had crank in the block . yes the 4.5 gasket does overhand edge of combustion chamber but apperantly its fine .. again according to several guys on here and kasse
AndyF wrote:Yeah Kaase says the 4.50 gasket works which is why I bought them, but the engine builder showed me how much it overhangs the combustion chamber and said he wouldn't put it together that way. So maybe it does work and maybe it doesn't. I wasn't going to argue with the engine builder so I just bought another set of gaskets. The 4.500 bore gaskets can go on another build.

Same thing with the Manley valve springs. Kaase says they work, Manley says they won't, and the guy I usually buy cams from told me they won't work. The engine builder I'm working with looked it over and said "might work, lets try it". So we're going to try it.

We checked for valve clearance and the exhaust valves seem to clear the cylinders at 4.390. I told Kaase that we were using a 4.390 bore size and they said they would put the smaller valves in them. I guess we could run into a situation where it clears fine on the engine stand but at RPM the valves start wiggling around. That would be bad.

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Post  supervel45 February 5th 2024, 4:11 pm

maverick172 wrote:ya well they told me that the 4.39 bore would work i only had i think .008 of lateral cylinder wall clearance . not near enough . i eyebrowed thm and now i got .040 lateral clearance . would hate to see you wreck your engine when it can be easily clearanced although i did it before i had crank in the block . yes the 4.5 gasket does overhand edge of combustion chamber but apperantly its fine .. again according to several guys on here and kasse
AndyF wrote:Yeah Kaase says the 4.50 gasket works which is why I bought them, but the engine builder showed me how much it overhangs the combustion chamber and said he wouldn't put it together that way. So maybe it does work and maybe it doesn't. I wasn't going to argue with the engine builder so I just bought another set of gaskets. The 4.500 bore gaskets can go on another build.

Same thing with the Manley valve springs. Kaase says they work, Manley says they won't, and the guy I usually buy cams from told me they won't work. The engine builder I'm working with looked it over and said "might work, lets try it". So we're going to try it.

We checked for valve clearance and the exhaust valves seem to clear the cylinders at 4.390. I told Kaase that we were using a 4.390 bore size and they said they would put the smaller valves in them. I guess we could run into a situation where it clears fine on the engine stand but at RPM the valves start wiggling around. That would be bad.

X10 on That!

https://www.429-460.com/t28967-521-cid-broken-camshaft-dowel-for-timing-gear-bent-valves

In case you missed it. You want about .030" clearance or more.

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Post  maverick172 February 5th 2024, 4:24 pm

what i ended up doing to measure my valve to cylinder clearance on the engine forgot to mention was i took a old valve and ground in too 1.74 than i used that as my go no go guage
supervel45 wrote:
maverick172 wrote:ya well they told me that the 4.39 bore would work i only had i think .008 of lateral cylinder wall clearance . not near enough . i eyebrowed thm and now i got .040 lateral clearance . would hate to see you wreck your engine when it can be easily clearanced although i did it before i had crank in the block . yes the 4.5 gasket does overhand edge of combustion chamber but apperantly its fine .. again according to several guys on here and kasse
AndyF wrote:Yeah Kaase says the 4.50 gasket works which is why I bought them, but the engine builder showed me how much it overhangs the combustion chamber and said he wouldn't put it together that way. So maybe it does work and maybe it doesn't. I wasn't going to argue with the engine builder so I just bought another set of gaskets. The 4.500 bore gaskets can go on another build.

Same thing with the Manley valve springs. Kaase says they work, Manley says they won't, and the guy I usually buy cams from told me they won't work. The engine builder I'm working with looked it over and said "might work, lets try it". So we're going to try it.

We checked for valve clearance and the exhaust valves seem to clear the cylinders at 4.390. I told Kaase that we were using a 4.390 bore size and they said they would put the smaller valves in them. I guess we could run into a situation where it clears fine on the engine stand but at RPM the valves start wiggling around. That would be bad.

X10 on That!

https://www.429-460.com/t28967-521-cid-broken-camshaft-dowel-for-timing-gear-bent-valves

In case you missed it. You want about .030" clearance or more.

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Post  supervel45 February 5th 2024, 4:46 pm

AndyF wrote:Yeah Kaase says the 4.50 gasket works which is why I bought them, but the engine builder showed me how much it overhangs the combustion chamber and said he wouldn't put it together that way. So maybe it does work and maybe it doesn't. I wasn't going to argue with the engine builder so I just bought another set of gaskets. The 4.500 bore gaskets can go on another build.

Same thing with the Manley valve springs. Kaase says they work, Manley says they won't, and the guy I usually buy cams from told me they won't work. The engine builder I'm working with looked it over and said "might work, lets try it". So we're going to try it.

We checked for valve clearance and the exhaust valves seem to clear the cylinders at 4.390. I told Kaase that we were using a 4.390 bore size and they said they would put the smaller valves in them. I guess we could run into a situation where it clears fine on the engine stand but at RPM the valves start wiggling around. That would be bad.

Hopefully "Seem" and "Might" or Right. Wink

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Post  FordPriest March 25th 2024, 7:17 pm

worthy competitor to the SR-20?

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Post  68formalGT March 31st 2024, 6:58 pm

FordPriest wrote:worthy competitor to the SR-20?

I kinda doubt it, in X275 they were adding weight to the SR-20 guys and Ford guys were doing serious work to A460's. That being said I haven't looked at the rules for a while for that class but the SR-20's had a lot of advantages to them and are 30+ years newer then the A460's
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Post  rmcomprandy April 1st 2024, 11:00 am

68formalGT wrote:
FordPriest wrote:worthy competitor to the SR-20?

I kinda doubt it, in X275 they were adding weight to the SR-20 guys and Ford guys were doing serious work to A460's. That being said I haven't looked at the rules for a while for that class but the SR-20's had a lot of advantages to them and are 30+ years newer then the A460's

SR-71 heads are NOT A460 style heads.

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Post  68formalGT April 1st 2024, 11:13 am

rmcomprandy wrote:
68formalGT wrote:
FordPriest wrote:worthy competitor to the SR-20?

I kinda doubt it, in X275 they were adding weight to the SR-20 guys and Ford guys were doing serious work to A460's. That being said I haven't looked at the rules for a while for that class but the SR-20's had a lot of advantages to them and are 30+ years newer then the A460's

SR-71 heads are NOT A460 style heads.

Correct, they are a raised port head but so far hasn't proven to be on the same level as the A460's and likewise with the SR-20....unless you've seen something out of them to say otherwise.
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