853 to ported 241 lost power?
#1
853 to ported 241 lost power?
Car ran good before but wanted more so I changed my cam timing with a cloyes hex adjust timing chain. Moved the 112 Texas speed ms3 cam to 108. Next I installed a set of hand ported 241 heads. Finished up with new exhaust and BMR rear suspension. Everything seems fine just doesn't have the bottom end pull or the sit u in the seat acceleration. Why? Car made 387 rwhp on dyno before changing out heads and timing chain haven't dyno end it sinse changes any help will be appreciated thanks
#6
We did degree the cam. My buddy builds race engines for a living and I assume he knows how to degree it correctly. Car fires up quickly and runs very smooth. The ls1 had great bottom end torque even with 3.42's and a 3200 converter. It still runs good but just doesn't seem to pull like before down low in the rpm. Trying to figure out if the ported heads or the timing is the culprit for the loss of power. My engine builder told me I should have more power down low with the cam degreed at 108
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#9
TECH Junkie
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Next I installed a set of hand ported 241 heads.
Who knows how big the runners and the chambers are, or if they are even equal across the board. With those randomly hogged out by some guy with a dremel, I'm not surprised your results are all over the place. You could've lost significant air velocity and compression (even with the earlier ICL) which would explain the loss in low end power.
#13
Ok I have narrowed the problem to the ported 241 heads so if I'm pulling the motor AGAIN then should I just buy a set of 243's or 243's cnc ported like patriot performance. I would like to get to the 450 rwhp mark. I'm right under 400 rwhp now with all my mods. Is the 243's the way to go on a stock bottom ls1 with Texas speed ms3 cam?
#17
TECH Resident
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Interesting, Im on here looking for info related to 241s and the MS3 cam. I am about to do this swap on my 00 SS and I have ported 241s and a MS3 cam that I plan to put in. Afraid I may run into similar problems. The heads have been ported but look professional. idk....
#18
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Interesting, Im on here looking for info related to 241s and the MS3 cam. I am about to do this swap on my 00 SS and I have ported 241s and a MS3 cam that I plan to put in. Afraid I may run into similar problems. The heads have been ported but look professional. idk....
#20
Launching!
Tried a cranking compression or leakdown test before tearing it down?
How did you conclude its the heads?
Big difference in your dyno vs expected #s.
Make sure you have some cyl pressure first
How did you conclude its the heads?
Big difference in your dyno vs expected #s.
Make sure you have some cyl pressure first