Appreciate everyone feedback and no my feelings are not hurt lol.i am here to learn and any constructive criticism is fine by me.Lloyd klem wrote: ↑Sun Dec 04, 2022 10:56 amThat burn pattern or lack of tells me there is quite a bit left.A good running engine has a nice even burn across 90 percent of piston and chamber.It should have a light gray/tan light dusty texture if right.When you have a sludge look across 1/3 of your piston and no even heat or cover across the rest ,you are leaving pretty good power behind.Could be cyl prep or ring type issue but I see allot of room in the valve job in that pic that needs addressed also.It will taking going to a bigger valve to get all the cuts sharp and correct again,it don't look like it could be fixed any other way.jmo.No disrespect to anyone involved but I see allot could be improved on.I never put a engine together without roll radius the sharp edges and laying some texture on top of piston to help with a even burn.im no fan of flattops to get a nice mixture motion,if that's used your valve job and head and ring seal needs to 100 percent on point.
Just to clarify-
Heads 165cc ported to 186cc
2.10" avg csa
1.94" - 1.5" valves
89% throat on intake
Bowl 100% of intake valve.
I done valve job with stones as that's all I have.
40,50,60,70,82
I ported heads,intake and built engine.
The block was honed using profilometer by my machine shop I use,they honed to JE recommendations.
Cam is a comp roller
240 - 256 @ 0.050 "
406 lobes
1.7 - 1.5 rockers.
Ran best ET,mph at track 109 ICL,109 LSA.
Made 522 ft/ lbs @ 5300rpm
570hp @ 6600rpm
Down 5 hp @ 7000rpm.
3620 pound Streeter
1.46 in 60ft
6.71 @ 101mph
10.62 @ 124. 65mph.
So I have some work to do by the sounds of it, I wonder if the MS109 fuel is not suitable for 11.4 compression?
I used it because of the short cam worried about cylinder pressure.
This year it had 20 dyno pulls,30 passes at track and maybe 500 miles of street, so not alot of work.
I have plenty to think about.