ahh, i just knew the duration and LSA was very close. then you mentioned milled heads too so i figure that would put the clearance even closer to a stock flat top motor. the TFS heads re-angle the valves and give extra clearance. some people seem to list cam specs and not the advanced numbers. most of the time advance is ground in on an off the shelf cam so i just assume it has advance now days lol.

 

thinking about putting a custom grind 227/227 .640/.640 112+4 LSA into my mostly stock lq4.

 

Most cam guys grind in advance, for various reason. The guy that spec'd my cam does not in most circumstances. Some people try to say that a a 113 LSA +4 is like a 109. But that's not really true. In most cases the LSA is still the same split it just open the valve earlier in the timing event. Opening the intake valve early will make the valve open to a point where it can contact the piston cause the piston has not traveled down the hole far enough to be out of the way. In alot of cases it is to start the closing of the exhaust valve sooner as to create better clearance on the exhaust side. That is where we wanna see more valve clearance cause the piston is chasing the valve back up the hole. Grinding in advance will make an exhaust valve clear, that might not have with out the advance. Its an insurance kinda thing...

 

good info ^

 

232-238, 598-600, 113+4 on lq9 with ls3s....

 

Some interesting setups. I bet alot of these 6.0's screamed. I have a 235/243 .621.624 111+4 cam that I had in my ls1 z28 that I planning for my 6.0 build for my truck and it worked great. I asked the question to mainly see where ppl stared having ptv issues. The heads I have are DART 205 with 62cc heads. With that cam and heads what would you guys recommend LQ4 or LQ9. And any guess on output. With all the little stuff. Thanks for all the help guys.

 

if you go with a LQ4 the dish pistons will give you more PTVC but youll loose compression IMO get a LQ9 and flycut the pistons

 

How do you all think this cam would work in a Lq9 with L92 heads. Also how big of a stall would you need.

21st Century Muscle Cars CMC-30 LSA, L99, LS3, LS9 Camshaft

 

So question for the lq4 guys with heads and cam. What is your compression and hp/tq levels and setup. And what do you guys think the heads and cam I have will do for an lq4. 235 243 .620 .623 111+4 and p&p dart 205. Any info would be helpfull thanks.

 

Before my supercharger my truck was running 13.2@100 with a starting tune. Never got it back after the tune was done. But with my 227/235 .61x/.62x 113lsa I would have to shift at 6900 rpms to get full use of the power. And it was still going strong when it shifts I'm just too scared to take it over 7k. Lol. Where does everyone else shift with these big cams