Dart SHP Pro Iron 434
02-23-2020, 04:00 PM
#201
I think he must be laughing at the rev the hell out of it comment. 305cc are a huge port.
Have I ever seen a strong running car with mast heads? I can't think of one off hand. It seems they are good at marketing.
My nascar ls7 heads are only 235cc little baby runners. LOL. I think they should be perfect for a 6.0 litre. If i ever get it done, there's always some other distraction happening. I should give it all to an engine builder and get them to finish it but i don't know anyone i trust. I've always done my own. If you have good luck with your engine guy on this build i might think about giving my engine to him to finish it.
Have I ever seen a strong running car with mast heads? I can't think of one off hand. It seems they are good at marketing.
My nascar ls7 heads are only 235cc little baby runners. LOL. I think they should be perfect for a 6.0 litre. If i ever get it done, there's always some other distraction happening. I should give it all to an engine builder and get them to finish it but i don't know anyone i trust. I've always done my own. If you have good luck with your engine guy on this build i might think about giving my engine to him to finish it.
Last edited by ramairws6; 02-23-2020 at 04:13 PM.
02-23-2020, 05:34 PM
#203
Nah I have never seen a strong running motor with Mast heads?! Kinda weird how if you search up and down the net for results on any Mast head combo's there is not much out there. There is a reason for that and its definitely not because they are a **** head, that I know. Oh and by the way, the ports are huge on the 305cc Mast's but do you know anything else about them? Like the valve height or the port and runner design?? Flow numbers at lower lift where the car spends most of it's time?? It's a whole different layout than the stock LS7 also and there was a reason for that. Just ask Cary Chouinard who designed the head......he'll tell ya!
02-23-2020, 07:58 PM
#205
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Tony is the best at explaining the whys. No details get left out. I know enough engine builders to fill a church service, and none of them, not one, will go into the details willingly like Dr. Mamo will.
I must say that the cam specs are much larger than I expected. Are you sure you stayed out of the discussion here Bortous?
I must say that the cam specs are much larger than I expected. Are you sure you stayed out of the discussion here Bortous?
I certainly did not want to be over cammed.
And this is what he came up with.
If you subtract 7 degrees from each end it ends up being a 249/255 hydraulic roller equivalent which isn't really all that large for a 434.
Don't forget with cathedral heads you need about 5 degrees of extra intake timing compared to square port heads to get the same effect.
I had 20 degrees of overlap in my previous setup with those lazy LS3 heads and this drove like stock down low. No bucking or surging whatsoever even with light throttle applications.
These new heads being way more efficient and having a higher speed port along with more cubes, it should swallow this camshaft up without a fuss.
Last edited by bortous; 02-25-2020 at 06:39 AM.
02-23-2020, 08:07 PM
#206
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But you are right, it is a bit on the largish side.
As stated, this was the plan all along to cam it up a bit using the long runner fast to get it to hang on up stairs.
Tony did say we are at or close to the limit of good driving manners with this stick.
Being a solid roller you also have more idle vacuum which also helps.
02-23-2020, 08:12 PM
#208
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G Atsma (02-23-2020)
02-24-2020, 12:48 AM
#211
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That is one beefy block! Here's wishing a successful build Bortous!
02-24-2020, 12:54 AM
#212
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Its very well built.
Builder showed me all the improvements over the ls.
More coolant flow, beefier caps, more material in bottom end etc.
I should've taken a photo of his drag car....
It was there.
Thanks
Builder showed me all the improvements over the ls.
More coolant flow, beefier caps, more material in bottom end etc.
I should've taken a photo of his drag car....
It was there.
Thanks
02-24-2020, 06:40 AM
#213
I really like the blocks. I have the aluminum LS Next version. I do wish it still retained the stock LSX side bolting strength but I guess Dart should know what their doing by now?! It made for a pita for the wind age tray and pickup tube configuration. Bottom end is definitely stout though 
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AINT SKEERED (02-25-2020)
02-24-2020, 06:50 AM
#214
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I really like the blocks. I have the aluminum LS Next version. I do wish it still retained the stock LSX side bolting strength but I guess Dart should know what their doing by now?! It made for a pita for the wind age tray and pickup tube configuration. Bottom end is definitely stout though
i have to get a new windage tray and fastener and oil pump to suit.
The arp kit is expensive also.
02-24-2020, 08:27 AM
#217
02-24-2020, 08:40 AM
#219
I really like the blocks. I have the aluminum LS Next version. I do wish it still retained the stock LSX side bolting strength but I guess Dart should know what their doing by now?! It made for a pita for the wind age tray and pickup tube configuration. Bottom end is definitely stout though