ZL1 with LS9 cam

[ZO6 Bryan]

Originally Posted by gen=5

a lot of shops go ahead and remove the heads to install the camshaft,as it is the correct way to do it i believe is it not.., They also charge you the same labor R&R heads or not..I understand you can use a long wooden rod to insert to swap out the cam...sometimes the long way is the quickest way to save off lifters falling.....!!

I was told by a friend i know who worked at Hennessy they always pull the heads,at least they did when he worked there...

Not true. Pulling the heads is a ton more work than just doing the cam. If Hennessy is always pulling the heads they're either doing more than the cam or just padding the bill. Absolutely not necessary to pull the heads to change the cam ever since the LS1 was introduced in 1997. GM even makes a tool to go thru the front of the engine to hold up the lifters. But most people just use the 5/16 dowel rods to make their own tool. And the labor to R&R the cam should not be just as much doing the heads too.

Now the only reason to pull the heads if doing a cam is if doing a really big cam on an LS engine that has flat top pistons and you are also fly-cutting the pistons to gain PTV clearance.

[Blackdevil77]

Definitely don't want to remove the heads. I didn't even want to do a cam, but after seeing videos of CTS-V's idling and driving with them, I'd consider it. You can't even tell it's cammed!

Also, bump my previous question, if anyone knows

Originally Posted by Blackdevil77

What lifters are used on the LSA? Same lifters as the LS9? LS3?

[ZO6 Bryan]

Originally Posted by Blackdevil77

Definitely don't want to remove the heads. I didn't even want to do a cam, but after seeing videos of CTS-V's idling and driving with them, I'd consider it. You can't even tell it's cammed!

Also, bump my previous question, if anyone knows

I believe all LS engines have the "LS7" lifters for the last 5 or more years. The LS7 lifter is actual the GM recommended replacement for all the early LS1, LS2 and LS6 engines.

[Blackdevil77]

Originally Posted by ZO6 Bryan

I believe all LS engines have the "LS7" lifters for the last 5 or more years. The LS7 lifter is actual the GM recommended replacement for all the early LS1, LS2 and LS6 engines.

That's awesome! If they're good to 7000 rpms in the LS7, they're definitely more then capable of 6600 rpm.

[potterluck]

I have this cam and it sounds nothing like the OP cam. Here is a sound clip of mine.


https://www.facebook.com/video.php?v...25355664285686

[DrkPhx]

^^^ Are you saying the cam in the idle video is a LS9? Hell no, but it sounds nice.

[trainman]

Just looked up the specs for each cam at Chevrolet.com/ performance:

LSA specs: 198 degrees Intake- 216 degrees exhaust, .492 lift I, .480 lift Ex, 1.7 rocker ratio

LS9 specs: 211 degrees Intake- 230 degrees exhaust, .562 lift I, .558 lift Ex, 1.7 rocker ratio