New 700+ HP N/A build
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Joined: Sep 2004
Posts: 827
Likes: 575
-Tony
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Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
www.mamomotorsports.com
Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
11 Second Club
Joined: Mar 2012
Posts: 1,541
Likes: 15
From: South Florida
Great work Tony!
What was the LSA on the camshaft.
I think the second picture down is of a different motor. The valley looks different & it has Trick Flow heads. Maybe the same rockers?
What was the LSA on the camshaft.
I think the second picture down is of a different motor. The valley looks different & it has Trick Flow heads. Maybe the same rockers?
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Joined: Sep 2004
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Same motor (good scope though!)....long story short is I removed the heads to have the opportunity to engrave the end pads with my logo. I had just finished working out all the details with the logo engraving and these heads and about a dozen others were part of the first wave of castings with my new end pad engraving complete with the MMS 265 insignia for easy identification.
Not sure if you can see it in the pictures but the machined finish on the end pad is much higher quality than any production machining environment....it took awhile to dial everything in but the finished results made it all worthwhile and it looked so good I had to include that feature on this engine build!! (figure it was worth about 5 HP.....LOL)
Cheers,
Tony
__________________
www.mamomotorsports.com
Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
www.mamomotorsports.com
Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
Why such a large split on the cam ?
Yes I understand it's a rectangle port headed motor. I could understand if the heads didn't flow that well in the exhaust department but since it's a aftermarket head vs a stock LS7 head I'm kinda scratching my head unless the op plan on spraying a shot of nitrous down the road. Here lately I been seeing LS3/LS7 aftermarket heads make great power without so much split such as navyblue 396ci.....
Yes I understand it's a rectangle port headed motor. I could understand if the heads didn't flow that well in the exhaust department but since it's a aftermarket head vs a stock LS7 head I'm kinda scratching my head unless the op plan on spraying a shot of nitrous down the road. Here lately I been seeing LS3/LS7 aftermarket heads make great power without so much split such as navyblue 396ci.....
Excellent results Mr. Mamo!!!
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Joined: Sep 2004
Posts: 827
Likes: 575
No holes in the power and torque curve thats for sure!!
Appreciate you popping in here
Regards,
Tony
__________________
www.mamomotorsports.com
Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
www.mamomotorsports.com
Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
Tony is the problem here also just the LS block itself not having enough bore to accommodate the larger exhaust valve while keeping a big intake valve. Sort of the max bores you see here are in the 4.155 and 4.185 while on your typical (not 396 bb chevy) the bore is 4.25 inches to start which most guys bored out to 4.28 / 4.31 and of course the bowtie block where the party starts with a 4.5 inch bore. So I guess what we need here is a 1.7 or larger exhaust valve when getting to these bigger cid and hp builds if we want to keep the exhaust duration down. Going with too big a valve I guess you could get some shrouding from the bore itself. I know on the BBC going to the 4.5 inch bore is a huge plus as it really unshrouds the valves in the bore. Funny the GM stage 3 cam is 233 /276 at .050 duration I guess GM was aware of the exhaust issue there.
The way I look at it is that the exhaust numbers aren't that bad, it's that the intake numbers are that good. Is a 245 duration intake lobe typical of a 440ci engine that peaks at over 6500 RPM? I don't think so. The LS7 intake port is one of the best OEM intake ports the hot rod gods have ever blessed us with. Because of that, we can shorten the intake duration to produce better idle and driveability characteristics, while still maintaining excellent power and that's how we are getting these big splits in duration.
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