tunnel ram tunning help 408sb

1Fast340 said

your english dont seem to be bad but if you need some help with translation feel free to PM me what you need translated and i will try to help out :)

but like others have pointed to in this thread i suspect your problem is not enough pumpshot or secondarys opening to quick creating a leancondition that makes the engine backfire thru the carbs.the carbs seem alitle small but i doubt the size of the carbs are the problem.
does the engine run good if you bring it up into higher rpms slowly?

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okey thanks. the engine dosent backfire thru the carbs,. the enigine runs really good in lower and middle rpm, but when you press the last little on the gas pedal it starts to run bad, maybe att 5000-6500 rpm its runs bad, it still runs bad if i try to slowly increasing rpm

svenska= den bluddrar/motar på fullgas låter de som iallafall.

the engine combo :
360 block
0,30 over probe srs pistons
scat 4" crank
596 heads 1,88 /1,60 vales
mopar performance purple cam P4120231 RPM Range 2,600-6,000
Duration 284/284, Lift .484/.484
weiand tunnelram intake
2 x holley 390 cfm 4-barrels

the engine is new built.

it is 4-barrel carbs.