Absolute Speed LS1 (5.7) Head Questions
#1
TECH Enthusiast
Thread Starter
Absolute Speed LS1 (5.7) Head Questions
Since Jay has pretty much disappeared I was hoping that someone that owns these heads could help me out here. I bought these heads (241 castings) from a forum member about a year ago. They were unused and have made good power. My question is are these heads milled (seller did not know)? I remember reading on Jay's site that these heads should have a CR of 10.8:1 but do not recall if they were milled. The reason I am asking is that I just purchased a F13 cam and am wondering if I am going to need to notch the pistons. The cam is on a 112 LSA, but with only +2 degrees of advance to try to get more piston to valve clearance. Thanks in advance for any help.
#4
TECH Enthusiast
Thread Starter
Thanks for the reply. I am planning on checking clearances. I was just hoping that someone who has these heads or recalls how he set them up would reply so I could plan accordingly.
#5
On The Tree
Join Date: Sep 2002
Location: Carencro, LA
Posts: 137
Likes: 0
Received 0 Likes
on
0 Posts
I had the 5.7 Heads from absolute and the biggest I could go without notching the pistons was a TR224 cam anything larger and I was having piston to valve clearance issues.
#6
TECH Fanatic
iTrader: (1)
I have AS 5.3's they were set up for a TR 224 and I could'nt go anybigger bause Jay hung the intakes out on the edge of the valve seat. I just got done notching and my heads were not milled. There are twowayso check if you have milled head, first you ca measure the thickness of the head bolt boss by the exhaust port if unmilled the measurement will be 1.615". Secondly, measure from the head deck to top of the head where the valve cover gasket goes that measurement should be 4.750" unmilled.
Trending Topics
#8
TECH Enthusiast
Thread Starter
Originally Posted by 2001 Pewter WS6
The AS 241's milled .030 and the F13 will have clearance issues. I had the same setup and you could see where the pistons touched the valves.