You are awesome brother... I think you are the only person in the whole world who has ever done any port work to a set of 260 heads! I wonder how much of an increase in horsepower would be picked up from the stock 110hp from this modification alone
I love seeing the "oddball" V8s get work done to them. And you definitely made improvements to the flow, especially as an average through the lift range. Don't worry about not as much improvement on the exhaust, they flow really close to the intakes as it is.
If you have the tools and possibility. I think you should do a nice valve job. Se what it gains, and slim the guide all the way, or even just remove most of it maybe, and wait with the pushrod pinch until later. I would guess these are really thinwall castings? The look like they have such tall shortside stock, the flow did gain everywhere though, that`s nice, can you get them to 150cfm? An 260HP 260 would be cool. Are you still doing the Turbo 260?
Yes I am still working on the turbo 260, just need to get it back outside in the spring to finish welding up the exhaust! I think 150cfm is a steep goal with the stock size valve. 140cfm might be more attainable. I may revisit this head later in the year, possibly sooner if the TT260 exceeds my expectations!
@@modeverything1 Drop in used 307 valves if you have some. Maybe it fits the bore? I think as long as it is a good functioning port, much of the job is done, even if the flow is not the highest. But it may just have too small volume i guess. While a somewhat poor comparison, an RS6 4.0 has 600hp, they probably do have nice heads, but only a 3.3" bore. (and a surprisingly tiny Y-coupling between the turbos an the "intake manifold", it made me think that size does not matter when you have 2 turbos...) Many VW and Audi heads do not flow that much, but they get decent power out of them, especially with a turbo or 2... I cannot see why an 260 could not be a decent running engine, for WHAT IT IS that is. You just have to correct some of the stupid stuff GM decided on... But it may be easier said than done. There is not that many years ago when you had a American car with 350-400hp engine you were really fast, the fastest factory cars had like 280hp, a Golf 2 or Peugot 205 with 150hp was pretty quick. But today, tall decks and powerglides is the norm, and if you do not have 1000hp you are "slow"
Yeah 1000hp is the new 500hp lol and I'm out here trying to get 200+hp from a 100hp engine 🤣 I saw a video of someone putting down 300whp from a 267 Chevy on something like 11psi of boost.. but I think he had a small cam and an aftermarket intake manifold. Just need to get it on the road and see what happens!
I’m looking at getting a pair of these 2a heads in place of my 76’ 350 #8 smogger heads. Could you please let me know what you think. Cannot find any information or flow charts or anything. Thanks pal
I would stick with the #8 heads, they flow much better than the 2a's. If you can't find 5,6,7 or 7a(1972) heads I would do a little port work on them and have them milled to drop the combustion camber size. I have a pair of 8 heads on one of my 350s that I will try to flow test whenever they get pulled off the engine.
They will bolt to the block but I don't know if the valves will clear the bore. Also they would need milled quite a bit to make up for the larger combustion chambers.
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You are awesome brother... I think you are the only person in the whole world who has ever done any port work to a set of 260 heads! I wonder how much of an increase in horsepower would be picked up from the stock 110hp from this modification alone
Hard to say how much power, but it will definitely help! I may try some more work on this one over next winter 😆
I love seeing the "oddball" V8s get work done to them. And you definitely made improvements to the flow, especially as an average through the lift range. Don't worry about not as much improvement on the exhaust, they flow really close to the intakes as it is.
Those valves are so far apart you could add a third one.
Yeah they are kinda funny looking 🤪
If you have the tools and possibility. I think you should do a nice valve job. Se what it gains, and slim the guide all the way, or even just remove most of it maybe, and wait with the pushrod pinch until later. I would guess these are really thinwall castings? The look like they have such tall shortside stock, the flow did gain everywhere though, that`s nice, can you get them to 150cfm? An 260HP 260 would be cool.
Are you still doing the Turbo 260?
Yes I am still working on the turbo 260, just need to get it back outside in the spring to finish welding up the exhaust!
I think 150cfm is a steep goal with the stock size valve. 140cfm might be more attainable. I may revisit this head later in the year, possibly sooner if the TT260 exceeds my expectations!
Well as long as your expectations are low.....
Haha! No I'm not expecting much from it. If it stays together long enough to make a pass at the track I will consider that mission accomplished 😆
@@modeverything1 Drop in used 307 valves if you have some. Maybe it fits the bore? I think as long as it is a good functioning port, much of the job is done, even if the flow is not the highest. But it may just have too small volume i guess.
While a somewhat poor comparison, an RS6 4.0 has 600hp, they probably do have nice heads, but only a 3.3" bore. (and a surprisingly tiny Y-coupling between the turbos an the "intake manifold", it made me think that size does not matter when you have 2 turbos...) Many VW and Audi heads do not flow that much, but they get decent power out of them, especially with a turbo or 2...
I cannot see why an 260 could not be a decent running engine, for WHAT IT IS that is. You just have to correct some of the stupid stuff GM decided on... But it may be easier said than done.
There is not that many years ago when you had a American car with 350-400hp engine you were really fast, the fastest factory cars had like 280hp, a Golf 2 or Peugot 205 with 150hp was pretty quick. But today, tall decks and powerglides is the norm, and if you do not have 1000hp you are "slow"
Yeah 1000hp is the new 500hp lol and I'm out here trying to get 200+hp from a 100hp engine 🤣 I saw a video of someone putting down 300whp from a 267 Chevy on something like 11psi of boost.. but I think he had a small cam and an aftermarket intake manifold. Just need to get it on the road and see what happens!
i think the best way to fix a 260 is a 400 shot of nitros to make sure you grenade it on the first hit
I will find out how much boost it can handle!
I’m looking at getting a pair of these 2a heads in place of my 76’ 350 #8 smogger heads. Could you please let me know what you think. Cannot find any information or flow charts or anything. Thanks pal
I would stick with the #8 heads, they flow much better than the 2a's. If you can't find 5,6,7 or 7a(1972) heads I would do a little port work on them and have them milled to drop the combustion camber size. I have a pair of 8 heads on one of my 350s that I will try to flow test whenever they get pulled off the engine.
Would a set of 7A heads from a 307olds motor fit on a 260? Then you could have a roller cam 260 and manifolds from a 403. Not sure if that would work?
They will bolt to the block but I don't know if the valves will clear the bore. Also they would need milled quite a bit to make up for the larger combustion chambers.