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Discussion Starter #1
Thinking about changing cam in my son mud bog truck. Runs hard but need a little more top end. Specs, c9 block eagle forged crank and h beam rods, icon forged pistons-13.45 comp. Tfs 325 cc heads with tulip exh valve, increased flow 18 cfm max avg,14cfm. Tfs mafia intake,Holley 1150 gen3 ultra dominator.2"tapered spacer ,bg belt drive fuel pump and bypass reg. Cam specs- int,267&50 273&50 744 lift int&exh, 108 lsa 104 int cl, installed 104 cl. Full msd ign, total timing 34 btdc. Fti 4000 hard hit stall and 3.89 gears rear-3.73 front, 39.5 r,38f. Weight- 3950, here's my problem, do I bother retarding cam 4 degrees or bump cam up to about 276 ish at 50 on int and 284 ish at 50 on exh with 108 lsa and 106 cl. Any thoughts would be helpful.
 

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Thinking about changing cam in my son mud bog truck. Runs hard but need a little more top end. Specs, c9 block eagle forged crank and h beam rods, icon forged pistons-13.45 comp. Tfs 325 cc heads with tulip exh valve, increased flow 18 cfm max avg,14cfm. Tfs mafia intake,Holley 1150 gen3 ultra dominator.2"tapered spacer ,bg belt drive fuel pump and bypass reg. Cam specs- int,267&50 273&50 744 lift int&exh, 108 lsa 104 int cl, installed 104 cl. Full msd ign, total timing 34 btdc. Fti 4000 hard hit stall and 3.89 gears rear-3.73 front, 39.5 r,38f. Weight- 3950, here's my problem, do I bother retarding cam 4 degrees or bump cam up to about 276 ish at 50 on int and 284 ish at 50 on exh with 108 lsa and 106 cl. Any thoughts would be helpful.
did you port the intake? dont retard the cam
 

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Discussion Starter #3
Intake manifold is port matched and all rough areas smoothed, heads are comp cnc ported thru out. Never got chance to Dyno last year, hopefully can Dyno this winter, rolling new bearings in and while apart, thought about cam adjustment. We are right there with the other guys in the class. Have the smallest motor in the, all the other trucks have 572 or bigger motors. Probably should have bought the tfs a heads, but in case son doesn't want to mud race any more can use on street machine. What u think boss?
 

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Discussion Starter #4
Just finished rolling new bearings in the motor, old rods n mains looked brand new. Always have good results with speed pro comp series bearings. Decided to leave cam alone till next fall, going to get better suspension parts instead. Double adjust shocks and extended radius arms. Checked rod bolt free length , all we're good when compared to new length- no stretch set in. Going to button up motor this weekend, intake n damper left to install.
 
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