CammedC6520

Hey guys i have a few questions anyone with a btr 4 cam that can shed some light about this cam. I just bought a American heritage performance head and cam kit. Milled .20 btr 4 cam. I have kooks headers with catted x pipe and corsa exhaust and a halltech intake. What do you guys see me getting on the dyno near sea level. What did you guys dyno? And after I install this do I have to flush the oil after the heat cycle. Cause I already on accident flushed my oil don't wanna pay for two oil changes thanks!

Thanks in advance


Oh and I have stock TB and intake manifold And stock pulley

User Omega

The dyno is a tuning tool more than anything. To give you some answer, you could see somewhere between 560 and 615whp depending on the tuner and the dyno.

Flushing the oil: You will find many opinions on this. I have always done it. No matter how clean you work you will always end up with things in the oil that are bad for it. This includes assembly lubes and things off of the new parts as they make a first run. I would consider it an absolute necessity to change the oil not only after a few heat cycles but even again after tuning.

Schred86

^ i agree with user omega. mid to high 5's. i recently made 620 but have more mods than you. my guess is 550-565. guessing you are running 91 octane. intake and t/b will hold u back a lil too.

As far as the oil goes, i dropped my oil, then changed it with amsoil break in oil for only 50 miles. then did another oil change with amsoil 5w-30. now after i hit 300 miles on this oil iam changing it again with z rod 10w-30. Overkill maybe, but you can never be too careful.

CammedC6520

Ok thanks for the info guys you guys have videos of your cars? And anyone else with a btr4?

Schred86

my winter build thread, there are videos inside

https://www.corvetteforum.com/forums...-mamo-e85.html

MTPZ06

^ This...the OE intake manifold is your biggest limiting factor now. A NW 102 TB will be worth a few more ponies, but at ~$600 its about $100/hp that you'll get out of it. Save your pennies for a Mamo Ported MSD intake, and there's another 40-ish rwhp there waiting for you.

CammedC6520

Yeah I was looking at one of those im going to do
That on the next build add that, meth, non catted x pipe UD

MTPZ06

Don't bother. Unless you get one for next to nothing used...there's no real HP there by eliminating your already high flow cats from Kooks. What you will get, is an increase in fuel smell/gas fumes by eliminating the cats...especially with an aggressive cam like the BTR4.

Tech

The oil change regimen depends. It's probably always safer to change it more often. I think changing it after a heat cycle is sufficient if you only used engine oil to lubricate your new parts. You wanna get whatever coolant, dirt or gasket residue out of it.

lt1z

The Intake manifold will hold you back with that cam.

Indepth

Curious how much the stock intake manifold will hold back a car with an aggressive cam like the BTR stage 4.

I just finished my build and kept my stock TB and intake manifold with an LS7R cam (.248/.256 .655"/.655" 114 LSA) and know I'm being held back by the stock intake manifold. I picked up a used, ported, FAST 102 intake manifold on the cheap and plan on swapping it and re-tuning here next month but have zero clue how much extra power I'll be looking at.

I've consistently read bigger cams need to breathe well to produce power, so this should help it breathe for a nice power bump, guess we'll see next month!

MTPZ06

I'll be shocked if you don't see 30 rwhp improvement...provided its the same dyno, similar circumstances, etc, etc.

Indepth

It will be the same dyno and same tuner.

I keep hearing and reading 30RWHP out of a ported aftermarket intake manifold with a cam this size is common I just find it hard to believe; but I'm certainly not upset about it if it holds true.

injfuel

550 or less , intakes gonna hold you back with the specs on that cam , I'm in the same boat right now , don't port the stock just save up for the MSD or Fast

MTPZ06

What did your car put down power-wise as it currently sits? Any mill on the AHP heads?

Ghost Knight

Mamo ported MSD will get you a solid 40whp. NW102 is 6-8whp (I dyno s before and after). I would skip meth and do e85. Depending on how efficient your heads are, e85 may not yield much power (I only gained 9whp, tuned). 624whp SAE on BTR 3 with full boltons stock TB.

Since you went BTR 4 already, your next move should be the ported MSD. You'll be amazed!

CammedC6520

Yeah I wanted meth for added insurance. Can't do e85 closes station is 20 miles away

User Omega

You can get ignite by the 55 gal drum.

CammedC6520

Yeah but then I need fuel injectors flex fuel e85 can not worth it for little money.

Indepth

It put down 550/501 on a Mustang dyno with the stock intake manifold on there.

AHP heads are milled .020"