1slow01Z71

iTrader: (36)

A .03 HG is going to give you a REALLY tight quench though

NextLevel

iTrader: (1)

Explain please for us newbs

dmelvin

iTrader: (8)

True, but hopefully I don't have a problem with it, someone on here was talking about milling a set of 243s/799s .05 on their LM7, which with the current mill on my heads with the .03 gaskets would put me at .049 closer ptv/pth clearance. Point is that if he's looking for a compressions boost, just milling the 799s .03 isn't going to help as much as he's looking at.

dmelvin

iTrader: (8)

Quench is the area between a pistion when it is TDC and the flat area of the combustion chamber of the head.

Here's a good article on it
http://www.chevyhiperformance.com/te...ide/index.html

NextLevel

iTrader: (1)

Great article that everyone should read doing a head swap. I can't wait to read your results, I'm very interested. I've got a body lift so I'm hoping that will make things go a little smoother for myself. Anyway theres another set of 799's on ebay for 350 shipped, still trying to find out if they have ls6 valve springs on them. I will just measure them when I get them, but I can't believe someone hasn't had more experience with the 799 springs

dmelvin

iTrader: (8)

https://www.performancetrucks.net/fo...d.php?t=434396

According to this, it looks like it does have the .570 springs ("GM Yellow Springs"). Looks like if you really have a question about them, I'd shoot the OP of that thread a pm, he seems to have all the answers on GM casting heads.

Also, I have .570 max lift springs also on my LS6 243 heads, they're not yellow either.

NextLevel

iTrader: (1)

I think so too, thats why these heads are such a good deal, especially if your milling them, and everything that moves on these are NEW! I've been looking for a while and these are the best buy I have found. I going to try and get someone to do some bowl work and smooth the intake runners.