G Atsma

C'monnnn man.... This is Tony we're speaking of here,, we all know he's the only one who can make cathedrals act like rectangulars when they need to.... lol
Keep knocking us out with your LS magic, Tony!

bortous

It seems Tony is still selling a lot of cathedral heads because there are many people out there who find the characteristics of this head more purposeful.
Application dependant.

jhshnh

Trust me, I’m not knocking the cathedrals. I have a pair of Tony’s MMS 220’s on my LS1. I’ll have it fired up very soon.
I’m just glad to see the theory that cathedrals don’t make big power on big cubes be proven wrong... once again.

“A ls engine doesn’t look at the intake port shape and decide whether or not to make power. It’s all in the overall combination.” Richard Holdener

G Atsma

^^^^^^^^^^Right here..... ^^^^^^^^^^

atlctsv

Love the build break down and comparison across the two different setups! Thanks for sharing. Massive power out of a 416! Looking forward to more of this. btw, awesome pictures

tcgrmt

iTrader: (1)

This makes me smile, can't wait to get my 407 going with Tony's 235's and his custom cam.

nmass399

Very nice, that’s good info for a build me and dad have coming sooner or later.

jmilz28

iTrader: (13)

Shockingly impressive yet not surprising. Been following your work for "a few" years and this is exactly what one would expect from you. Premium work and worth every penny. Well done sir, well done.

bortous

Hey Tony,
I have been thinking, the 2nd engine which made 691 hp, what would the power difference be if you had put your ported fast 102 on there?
Would it be a 15hp loss I wonder?

Tony @ Mamo Motorsports

Peak torque would have been higher (10 or so Ft/lbs).....the lower and middle part of the curve would have been lifted from the very beginning of the pull, but after 6K the torque (and power) curve would have rolled over faster and it would have cost the customer 10 - 15 peak HP and would have been down 20 or so closer to 7500 RPM's which is the very usable current RPM I would suggest for optimal shift points.

Bort......its all laid out very well in this thread below where I do the exact test your inquiring about but on this particular engine (highlighted in this thread), the losses from the FAST would have been a little greater (its higher output and larger RPM appetite the reason why).

https://ls1tech.com/forums/generatio...orted-msd.html


In this application.....a light car with a Glide and a 5500 stall, the MSD was the clear winner here as the gains the FAST offers down low are meaningless. Once this car leaves the line it will grab second gear around 7500 and probably never see under 6K even on the shift. The MSD was absolutely perfect here but most guys reading this thread are probably better candidates for the ported FAST with heavier cars and 7K ish typical shiftpoints etc. The thread I linked above really lays it out in much greater detail....take the time to check it out

Regards,
Tony

grubinski

Very interesting post, thanks for posting! What are the cam specs on engine #1 ... you stated them for #2, but I didn't see them for #1.

G Atsma

241/246, .650-ish lift w/1.8 rockers. LSA is MIA..
I had to look too, it was between 2 pics.

grubinski

I'd like the LSA info to figure out the events. Nothing is more fun than bench racing camshafts. :-)

G Atsma

I'm with ya there!

DavidBoren

If I had to guess the split on the 1st cam, I would say 114+2... based on other Mamo spec'ed cams that have been posted, and the cam Tony posted for the other engine... but this one needed some advance ground into it because road racing/early torque...