new combo missing a bunch of power?

[Barnstorm]

what do the plugs look like?

[pfordamx]

whats different? the old motor was 9.5 to 1 stock stroke 390 with a 238@.050 hydraulic flat tappet with some iron heads that flowed about 260@.700 a torker and a 850 holley behind it was a 904 and 8inch 3800 stall converter and 4.10 gears car ran 11.50s at 115 at the time the car had all stock suspenion except caltracks and some 90/10's and almost wieghted the exact same took out a 6 point steel bar added 10 point molly cage. out side of that the car has been completely rewired and re plumbed fuel and brakes have been redone the whole front end has been gone through. its basicly a new car theres not much to compare from the old combo the heads flow 40 cfm better its got a much bigger solid roller, 3.5 points more compression and 30 cubes on the old combo but somehow it is slower. the only similarity is the 4.10 gear and 28 inch tires although we went from a bias ply to a probracket radial.

[pfordamx]

oh and the plugs look good for a gas motor but i'm not as schooled in reading e85 plugs i sent a few photos to the carb builder and he said they looked a little rich, but i don't think a little rich is causing this kind of power loss.

[Tom Goldman]

Having built many similar AMC engines ,I have to say , you could pour fuel thru the manifold out of a coffee can and it would run faster than that !
I would be very suspicious of the converter sprag .
That combo should run hi 9's lo10's with ease .

[CFMCNC]

Do 2 quick diagnostic checks,Cylinder leakage test and cranking compression test.If good go directly to a well instrumented engine dyno ,That will save you many dollars in track testing and parts changing.One obsveration if static compression ratio is as stated ,cam durations are to big.Bill C.

[CFMCNC]

305 CFMs will support over 730Hp.Were heads flowed with manifold attached?.Bill C.

[pfordamx]

no they were not, the intake is a modified edelbrock torker, we have a better manifold that will be going on but i don't think the the manifold is a 300hp problem will do a leak down and compression test and the converter is going back to tci which is funny because they had it and put a new hub in it about 3 weeks ago that actually might make it more suspect. its maddening to know you have a combo thats a solid 2 seconds slower than it should be without an obvious reason.