Modding a 4.8
#12
12 Second Truck Club
iTrader: (13)
honestly 241 heads were one of the worst heads made. They don't even flow better the stock truck heads. If you want to replace the heads, buy a pair or 243s..
241
Chamber 66.67 cc------0.100--0.200---0.300---0.400---0.500---0.550--0.600
Intake 200 cc------------67----122-----178-----215-----219-----223---227
Exhaust 70 cc------------52-----97-----133-----156-----170-----176----180
706/862
Chamber 61.15 cc----0.100--0.200--0.300-- 0.400--0.500---0.550---0.600
Intake 200 cc----------63 ---128----179-----210----218----221-----226
Exhaust 70 cc----------54 -- 93 ----121----145-----163----168----174
241
Chamber 66.67 cc------0.100--0.200---0.300---0.400---0.500---0.550--0.600
Intake 200 cc------------67----122-----178-----215-----219-----223---227
Exhaust 70 cc------------52-----97-----133-----156-----170-----176----180
706/862
Chamber 61.15 cc----0.100--0.200--0.300-- 0.400--0.500---0.550---0.600
Intake 200 cc----------63 ---128----179-----210----218----221-----226
Exhaust 70 cc----------54 -- 93 ----121----145-----163----168----174
#16
Teching In
Thread Starter
Join Date: Dec 2009
Location: Acworth, GA
Posts: 36
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I wanted to bring this back up for several reasons. One I wanted to thank everybody for the advice on the 241s. Now I've picked up a set of 852s and I'm having them milled and using a thinner head gasket to bump the compression to 10.5:1. Two is to see what y'all think about the valves. There's nothing wrong with them, but the heads have 120k on them. Do I need to have new valves put in or will the existing ones be ok?