Before and After JM's Striker Heads - Not so creamy anymore!

[SEASNAKE]

Before and After JM\'s Striker Heads - Not so creamy anymore!

It's like learning to drive a Viper all over again. A/F ratios in the mid 12s and no check engine lights.

Before Mods

K&Ns
Smooth Tubes
1.7 Arrow rockets
High flow cats
3" Corsa Cat back
418 RWHP/ 455 Ft-Lbs


After Mods

K&Ns
Smooth Tubes
Striker Heads w/ 1.7 Jesel Rockers
708 Cam
Belanger Headers
High flow cats
3" Corsa Cat back
529 RWHP/ 547 Ft-Lbs

 

[Da1cop]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Wow, thats impressive!

 

[1TONY1]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Those are the cnc heads, not the billet heads..correct ? Whatever, it looks like they are doing the job. Nice numbers. You can definately see where the stock stuff quits flowing.

Any fuel management ?

 

[SEASNAKE]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

These are cnc machined from scratch. They fit flawlessly. This is with the stock '01 pcm and fuel system.

 

[Robert Dyck]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

I'd like to do the same thing to my 02 RT. Can you give me some info.....e.g., Who did the work? any issues?

 

[SVS Turbo]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Awesome!

JM Striker Heads continue to create impressive #'s

Are these the race head or street head?

We installed the JM street head on a 2001 with fuel system, JM Cam, Motec, SVS 1 5/8 - 1 3/4 stepped headers, 3" exhaust and made 600rwhp 600rwtq

You have an easy to install system that makes great power.

Congrats!

 

[rcdice]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

I'd like to do the same thing to my 02 RT. Can you give me some info.....e.g., Who did the work? any issues?

Ditto that. I know you just stated it, but I'll ask again (just the way I am). Absolutely nothing to the computer or fuel system? If so, that's awesome. Should be very reliable NA power. How much more than stock do the heads flow?

 

[SEASNAKE]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

ABSOLUTELY no modifications to the computer or fuel system.

There are only two people who have worked on my car. Tom Sessions and myself and I would recommend Tom for doing the work, just keep in mind that he stays REALLY busy these days.

The heads and rockers are pretty easy to install with normal tools (torque wrenches, etc) and fit extremely well. The biggest pain is draining the coolant (I hate coolant) or breaking the heads loose from the head gaskets.

Pulling the cam requires a LOT more work.

The Belanger headers are easy to install, but do require welding.

Jeff has some flow numbers on his web site and I would suggest you contact him for that information.

 

[SidewinderGTS]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Awesome numbers.

 

[ViperJohn]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

I find it hard to beleive the stock PCM can handle the cam swap without any check engine lights. You should eventually throw P0300 which is a general misfire code.

 

[ASKYOURWIFE]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Whats the general price on those heads????

guess Im just a newbie to the viper world but I had no idea that my 99 rt 10 could make 500-600 rwhp Non asperated with just a few bolt ons and heads..

I knew that the forged 1999 could make huge numbers with boost but low 500's or 600 NA is much more exciting..

Continue on with the info.

 

[PhoenixGTS]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

So given that you already had everything else, the heads and Belangers made 110 rwhp. Pretty awesome. You can really tell those heads flow by how the hp peak moves up in the rev band. No more short shifting for you.

 

[BoeingMan]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Outstanding numbers! Was wondering though, since you had the heads off, why didn't you go ahead and have the pistons upgraded at that time?

Again congrats on your project.

Matt

 

[BoeingMan]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

So given that you already had everything else, the heads and Belangers made 110 rwhp. Pretty awesome. You can really tell those heads flow by how the hp peak moves up in the rev band. No more short shifting for you.

Actually it looks likes heads, headers AND CAM increased his numbers over what he had previous.

Matt

 

[SEASNAKE]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

I have no plans to go forced injection, so I didn't worry about changing the pistons. This was my christmas/birthday/anniv. gift for the next 5 years.

I will let you know if a engine light does come on. This is my daily driver so it shouldn't take too long if there is a problem. I've already put 200 miles on since the mods. The car runs great - so I really don't think it will be an issue if it hadn't already showed up.

It was strongly recommended to me to get headers installed for the heads, otherwise reprogramming would be needed. Again, I would refer you to Jeff for more details.

Prices (approx)
Heads(w/rockers) - $6400
Cam - $300
Headers - $1800
Misc - $1000 (gaskets, plugs, fluids, etc)
Installation - ? (figure about 15 hours for a good tech)

 

[Tom F&L GoR]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Pardon my ignorance, but what does "These are cnc machined from scratch." mean?

CNC usually means the computer is running a program (copy) so you're throwing me when you added "from scratch."

 

[GTSnake]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Pardon my ignorance, but what does "These are cnc machined from scratch." mean?

CNC usually means the computer is running a program (copy) so you're throwing me when you added "from scratch."

These heads are CNC machined from a brand new casting. Which means the design was started from a clean slate and not based on the stock design. The valves are more unshrouded and the plug is angled. I think the coolant flow is also better too.

 

[Simms]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Awesome gain! Congrats.

 

[apun]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

What kind of gas were you using?

Are you using a wideband O2 sensor in the stock location to get your readings?

Or are you using one that is shoved up the tailpipe? The AFR on your chart looks closer to 13:1.

It was strongly recommended to me to get headers installed for the heads, otherwise reprogramming would be needed.

Any ideas why? Does Jeff frequent this board?

Awesome numbers!

Thanks,
Alex

 

[1TONY1]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Pardon my ignorance, but what does "These are cnc machined from scratch." mean?

CNC usually means the computer is running a program (copy) so you're throwing me when you added "from scratch."

Sounds like he got the heads that started from a big fresh chunk of aluminum. Jeff also has a cnc program for factory heads.
What threw me off was the T&D rockers. I thought the true billet heads would not accept normal aftermarket Viper rockers.......that they had to use a special rocker....maybe Crowers ????

 

[Fast Freddy]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

It's like learning to drive a Viper all over again. A/F ratios in the mid 12s and no check engine lights.

Before Mods

K&Ns
Smooth Tubes
1.7 Arrow rockets
High flow cats
3" Corsa Cat back
418 RWHP/ 455 Ft-Lbs


After Mods

K&Ns
Smooth Tubes
Striker Heads w/ 1.7 Jesel Rockers
708 Cam
Belanger Headers
High flow cats
3" Corsa Cat back
529 RWHP/ 547 Ft-Lbs

very nice! looks very similar to my graph as are your mods. my cam is setting off my check engine light though

 

[1TONY1]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Knowing now that those are the higher priced billet heads....

Aren't those power levels basically the same as any heads/cam/header car ? 529/547

 

[GotAViper]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

if the heads cost 6400$...

couldnt you just get an ROE super charger and beat those numbers for not much more?

 

[Viper23]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Why would a cam set off a check engine light? Just was curious cause I am putting a cam in my car.

Thanks

 

[JohnnyBravo]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Pardon my ignorance, but what does "These are cnc machined from scratch." mean?

CNC usually means the computer is running a program (copy) so you're throwing me when you added "from scratch."

Sounds like he got the heads that started from a big fresh chunk of aluminum. Jeff also has a cnc program for factory heads.
What threw me off was the T&D rockers. I thought the true billet heads would not accept normal aftermarket Viper rockers.......that they had to use a special rocker....maybe Crowers ????

Tony,

You are correct about the rockers. The new Stryker heads have to have completely custom made Jesel rockers. They come with the heads. The offset of the valves, etc is completely different from a stock GenII Viper head, so a regular set of T&D/Jesel/Mopar rockers won't fit. That's why when you buy Jeff's heads, they come with the custom Jesel rockers already installed.

I saw those heads in person at VOI9 and I can tell you, they are beautiful.
Plus, Jeff was a totally cool guy. Very knowledgable about the Vipers, very willing to talk to you about anything and everything car related, and fun to hang out with and have a beer with in a social setting.

 

[GTSnake]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Jeff lurks on these boards but I've never seen him post anything. I'm sure he's read or going to read this thread.

Did I get my facts right Jeff?

 

[Russ M]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Very impressive considering there is no tune involved. Which brings me to my next point, unless you want that motor to grenade on you a tune and the rest of of the needed hardware is a must.

At that power level you will need injectors or at least a boost a pump, and a Vec 2 or better yet AEM unit.

Once you do that I would not be surprised if you got close to 600rwhp.

 

[ROGUE]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Why would a cam set off a check engine light? Just was curious cause I am putting a cam in my car.

Thanks

It really depends on how agressive the cam is, lobe separation, overlap, etc. A cam with a lot of overlap (at lower rpm) will cause exhaust gasses to somewhat be pushed back into the intake, it's what gives a big cam that loping choppy sound. And can also give a misfire code.

 

[GTSnake]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

I thought it was due to the PCM reading ignition pulses that don't match up with the stock profile.

 

[GTS Dean]

Re: Before and After JM\'s Striker Heads - Not so creamy anymore!

Overlap and exhaust flow reversion are the major issue. It would be really interesting to see what this motor does on a 5-gas smog test.