MS4 and 5.3 heads flycut or can you sink the valves?
#1
On The Tree
Thread Starter
iTrader: (22)
Join Date: Aug 2006
Location: southern il
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
just purchased a MS4 from TSP, but if i go with there 5.3 heads do i have to flycut the pistons? if so maybe i can just do a MS3 and have them sink the valves little further. what do you guys think?
#2
TECH Resident
Join Date: Jan 2003
Location: AUSTIN TX
Posts: 855
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
They may be able to sink the valve enough that you will be able to get away with it with a stock gasket, but your DCR will suffer. For the best performance you need to flycut, then run a .040 gasket and maybe even mill the heads some to bring your DCR back up. Remember, the larger the cam you run, the higher the compression needs to be to make it perform right.
#7
TECH Senior Member
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Sinking valves is a band-aid IMO and still doesn't offer "safe" PTV margins.
It will hurt flow, it also makes valvetrain uneven unless exhaust are sunk by same amount.
Yes it works, but IMHO it is not the best way to go about it. On the pro side it lets the boys stick that "big one" in, which is most of what they are interested in.
It will hurt flow, it also makes valvetrain uneven unless exhaust are sunk by same amount.
Yes it works, but IMHO it is not the best way to go about it. On the pro side it lets the boys stick that "big one" in, which is most of what they are interested in.
Trending Topics
#9
TECH Senior Member
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
![Angel](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_angel.gif)
#11
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Well Dam, It Must Have Been Those Sunk Valves That Limited Me To Makeing Only 430 Rwhp Through A Unlocked 4000 Stall
All Well Since I Didnt Flycut I Dont Have To Worry About Hotspots Or Cracked Pistons When I Spray
IF IT WAS ME ID ASK TSP (ITS THEIR BEST SELLING COMBO)
All Well Since I Didnt Flycut I Dont Have To Worry About Hotspots Or Cracked Pistons When I Spray
![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)