svede1212

iTrader: (3)

Haven't been on the boards in a long time and it's been even longer since I installed my Mamo 220s and custom cam. The full build (roughly) is a:

home built 6.3 litre LS1 stroker
Callies crank and rods, Wiseco pistons, all ARP
11.6:1 compression
Mamo 220s
.631/.631 235/240 112 cam
Yella Terra rockers
11/32' push rods
FAST 102
NW 102 TB
42# Ford "greeentop" injectors
Svede OTRCAI
SLP 3/4" headers
Custom 2 1/2" duals with 4 mufflers
Melling pump
ATI balancer
SD tune

Previous to the new heads and cam she put down 437 HP with ported 243 heads and a FTI Streetsweeper HT cam

Every year we have a big cruise (second only to Woodward) in my town. That previous run was two years ago on a portable DynoJet they run there from BackStreet Performance. Last year the dyno got rained out. Tonight I went out there on a whim as the dyno was usually run on Saturday. I have obligations tomorrow and was bummed that once again I couldn't make it. I was surprised they had it going tonight and got in line. I think comparisons are best on the same dyno, same conditions. Tonight she put down 480 RWHP with 460 TQ. I was getting knock up top (which I'd not gotten on the street) and the operator had to back down and she dived after knocking. He said I should be closer to 500 with things sorted out. That's still a 43 RWHP gain. I was impressed and happy although I knew from driving her that she has more HP than tire.






2017 dyno graph w/Mamo 220 heads

HCI2000SS

iTrader: (2)

Nice! The cruise you speak of 2nd to Woodward, Is that the 28th street cruise in Grand Rapids?

svede1212

iTrader: (3)

Yes sir. Haven't missed a one and it's only 10-12 miles from my house so that's nice

HCI2000SS

iTrader: (2)

Thats cool. We have a really big one here in Flint that goes for 3 days, then the main show on the same day as Woodward

Darth_V8r

iTrader: (4)

Nice build. Got sound clips of that four muffler exhaust?

Edit - and pics?

svede1212

iTrader: (3)

This is the first pull of 468 before the immediate next pull of 480. I was bummed I got such bad knock up top. In street tuning it logged none. Those dynos are hard on an engine I guess. 490 or more is possible.


Can't find current picture of exhuast but here's one before I split the tail pipes. The front half from the header flange through X pipe back to the Borla Pro XS mufflers is still the same. I added two 16" DynoMax bullets after 2 1/2" mandrel bends out of the Borlas before angling back to the custom cuts on either side of the '04 rear valiance. The 3" "mid"-pipes are seen by the engine as part of the header collector before the reduction in diameter and tune the exhaust for great street torque.