LS1 PTV clearance
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
Likes: 0
From: IL
LS1 PTV clearance I'm planning on installing the Comp Cams grind no. XER287HR part # 54-448-11 in my stock bottom end ls1 around May. I also have a set of gm cast 243 heads and want to mill them 5-7 thou to even them out and also run the thinner felpro .041 head gasket for a tighter quench. Wondering if anyone has run this cam before and what their setup was like. I'm mainly concerned to what my approximate PTV clearances would be and if i would need to fly cut my pistons. Cam specs below and link.
Intake Duration at 050 inch Lift:238
Exhaust Duration at 050 inch Lift:240
Intake Duration:287
Exhaust Duration:289
Intake Valve Lift :0.605 in.
Exhaust Valve Lift :0.609 in.
LSA:112
http://www.compcams.com/Company/CC/c...csid=1094&sb=0
Intake Duration at 050 inch Lift:238
Exhaust Duration at 050 inch Lift:240
Intake Duration:287
Exhaust Duration:289
Intake Valve Lift :0.605 in.
Exhaust Valve Lift :0.609 in.
LSA:112
http://www.compcams.com/Company/CC/c...csid=1094&sb=0
TECH Junkie
Joined: Nov 2013
Posts: 3,913
Likes: 366
From: White Bear, Mn
You should check your ptv clearance but I say you will be good. Here is a good way to check.
https://ls1tech.com/forums/generatio...ve-method.html
https://ls1tech.com/forums/generatio...ve-method.html
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
Likes: 0
From: IL
Ya I'm going to clay the pistons or maybe try that method just wondering if other people have run a similar set up. Theres not too much information on the cam on the forums and I talked to comp about it and they were useless lol.
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
Likes: 0
From: IL
Originally Posted by Pantera EFI
Hi RJ, state your Valve Drop, I could then provide your P/V using EAP.
Lance
Lance
Valve Drop Measurement Method Hi RJ, I am SURE many here need the same "tech"
The Term "valve drop" is a common term a machine shop uses to STATE the distance FROM the Head surface to the CLOSEST EDGE of a Valve both Intake OR Exhaust, EACH DISTANCE.
Lance
The Term "valve drop" is a common term a machine shop uses to STATE the distance FROM the Head surface to the CLOSEST EDGE of a Valve both Intake OR Exhaust, EACH DISTANCE.
Lance
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
Likes: 0
From: IL
Originally Posted by Pantera EFI
Hi RJ, I am SURE many here need the same "tech"
The Term "valve drop" is a common term a machine shop uses to STATE the distance FROM the Head surface to the CLOSEST EDGE of a Valve both Intake OR Exhaust, EACH DISTANCE.
Lance
The Term "valve drop" is a common term a machine shop uses to STATE the distance FROM the Head surface to the CLOSEST EDGE of a Valve both Intake OR Exhaust, EACH DISTANCE.
Lance
