[chiphead]

OK, yet another "what cam" thread.

Need a spec for a hyd roller for a street/strip 400 in a 3700lb lemans. I need at least 11" of vacuum to run the PDB.

4.155 by 3.75, forged pistons and rods
ported 670s, 9.3 compression, pump gas
Q-jet, RPM intake, headers, 150 hit of nitrous
power disc brakes, tight 3000 stall, TH350
Ford 9" with 3.25s on the street and 3.90s at the strip.

[prostreet64]

I am not sure how close the correlation would be, but some time back we were running the XE284 flat tappet cam in the Bird and it would support the pdb. That cam was 240/246 and I imagine we didn't have any to spare as far as vacuum was concerned. IIRC it was around 10-11 at idle on our combo which was very similar to yours. The question is whether or not a hydraulic roller in the same ball park would 'act' the same.

[ponyakr]

How about a 230/236 grind, with at least a 112 LSA.

The KRE HR230 might work.

http://www.krepower.com/Pontiac%20Ca...nd%20Parts.htm

Butler can also order 1 with these specs.

http://butlerperformance.com/i-24623...51-000-11.html

Or, how bout this Voodoo 231/239 ?

http://www.lunatipower.com/Product.aspx?id=3210&gid=289

OR, you can go a little smaller, and know you'll have plenty of vac, a smoother idle, and more low end torque. Might be a little slower on the track, but better on the street.

http://www.lunatipower.com/Product.aspx?id=3209&gid=289

KRE & Butler show a 224/230.

Howards has a 219/229 cam with a 4/7 swap . Some like the 4/7 swap. Some don't.

http://howardscams.com/i-24077220-ho...-camshaft.html

https://www.summitracing.com/parts/h...geYaAr818P8HAQ

[69goatboy]

I have a XR288HR in my 400. In retrospect, I think it might be a bit much for my street car. I really have to wind it up for the punch to kick in, but when it does, hold on.

Sounds like yours is set up for a little more spirited driving than mine is, so the XR288HR might be a good choice for you.

[JLMounce]

I have a 232/238 112 in my 462. At 5000 ft elevation it makes 11-12" at idle, so probably closer to 14-15 at sea level. Pulls strong to 5700 rpm in the larger engine.

This type of deal might work well in your 400 for a bit more high strung characteristic. I would think it would still pull enough vacuum to operate your brakes as well.

[pastry_chef]

Comp QXX Hyd Roller

Intake Lobe 13474
285 adv dur
231 @.050
150 @.200
.371 Lobe lift

Exhaust Lobe 13477
291 adv dur
237 @.050
156 @.200
.377 Lobe lift

112 LSA , install at 108 intake cent

[gtofreek]

I'm going to be dynoing a 400 next week with a 231/239 HR Voodoo cam. It has ported 670's @ 10:1 compression. If you're curious what it will do.

[61-63]

I'm curious.

[slowbird]

We running 242-248 with ported 62's, runs mid 11s

[chiphead]

I'm curious what that 400 will do. I want to avoid the temptation to over-cam, as I'll be cruising the car much more than racing it. With two little kids, I can't be racing and breaking it every weekend like I used to. I need the reliability of the roller, as another cam failure will force me to sell the car. I cannot afford more valvetrain failures.

It's got 3.90s in it, but the beauty of the Ford 9" is that I can swap in some 3.23s for driving to work and the cruise-in. I've grown out of the lumpy cam/deep gears on the street thing. So I'll happily trade the last .1 of ET for street manners and lower RPMs. I may run it at the track occasionally but not like I used to.

Is the 4/7 swap worth it on a street/strip car? Would 112LSA be better or worse than 110 with spray? Are you guys running dual springs or beehives with HR cams?

[JLMounce]

Originally Posted by chiphead

I'm curious what that 400 will do. I want to avoid the temptation to over-cam, as I'll be cruising the car much more than racing it. With two little kids, I can't be racing and breaking it every weekend like I used to. I need the reliability of the roller, as another cam failure will force me to sell the car. I cannot afford more valvetrain failures.

It's got 3.90s in it, but the beauty of the Ford 9" is that I can swap in some 3.23s for driving to work and the cruise-in. I've grown out of the lumpy cam/deep gears on the street thing. So I'll happily trade the last .1 of ET for street manners and lower RPMs. I may run it at the track occasionally but not like I used to.

Is the 4/7 swap worth it on a street/strip car? Would 112LSA be better or worse than 110 with spray?

My opinion and take it for what it's worth, but it sounds like you need to decide if this is going to be a street car or a race car. You're worried about failure from a cam, but talking about hitting the engine with nitrous in the same breath.

If you're truly a cam failure away from selling the car, it might be time to evaluate what you want from the vehicle. Your cam selection is going to be very much determined based on what you're doing. The best thing for you right now is to be 100% honest with yourself on what you're going to be using the car for. Otherwise you're going to end up with a setup that doesn't quite work for anything.

I struggled with that same thing myself until I realized that 98% of the time all I do is drive the car around town. I wanted a big, rough cam and all the power in the world, but when it came down to having a cam spec'd for me, it was done so based on how I use the car and the parts that are or were going into it.

You may find that like me, the cam you want is quite different than the cam you need.

[surfsama]

How about the trusty "Stump Puller" or shoot Dave the specs and have him make a custom grind.

I'm running the Old Faithful in a 433 with 11 inches of vacuum and great street manners. However, I have 10.5 compression E-Heads.

Also, as discussed in other threads the choices of hydraulic roller lifters currently available for Pontiac's leaves a lot to be desired...I replaced a ticking set with another set and that was $$$.

[HWYSTR455]

Originally Posted by gtofreek

I'm going to be dynoing a 400 next week with a 231/239 HR Voodoo cam. It has ported 670's @ 10:1 compression. If you're curious what it will do.

Subscribing. I'm curious too!

Like to see what that cam Pastry Chef suggested would do too!

.

[chiphead]

It's going to be 75% street car. But since I've already got all the racing/nitrous/front end stuff installed it would be nice to still be able to use it. Just swap in the 3.90s, the drag radials, drop the exhaust and let it eat, ya know?

If I was gonna call somebody for a custom HR cam, who should that be?

[pastry_chef]

Originally Posted by chiphead

I've grown out of the lumpy cam/deep gears on the street thing. So I'll happily trade the last .1 of ET for street manners and lower RPMs. I may run it at the track occasionally but not like I used to.

Is the 4/7 swap worth it on a street/strip car? Would 112LSA be better or worse than 110 with spray? Are you guys running dual springs or beehives with HR cams?

I would not worry about 4/7 swap here.
112 LSA better with spray.
Go with a good dual spring.

[HWYSTR455]

Originally Posted by pastry_chef

I would not worry about 4/7 swap here.
112 LSA better with spray.
Go with a good dual spring.

Totally agree, and 112, or better yet, 114. Guess I missed the spray part. You can actually go a little bigger on the profile too with a 114 LSA and maintain drive-ability.

http://www.hotrod.com/articles/ccrp-...cams-worth-it/


The VooDoo profiles to my understanding don't particularly work as well when the LSA is bumped, but I'm just repeating what I've heard and have no experience there.

I know Comp and Crower both have very good turn arounds on custom grinds. Not sure about Lunati or others.

.

[ponyakr]

"...If I was gonna call somebody for a custom HR cam, who should that be?..."

Bullet Cams also has a good rep for custom grinds.

http://www.bulletcams.com/Masters/Masters.htm

[gtofreek]

Installing a Voodoo cam only 4° advanced, instead of Harolds recommended 6°, it will position the valves at TDC during overlap more comparable to widening the lobe sep. It's because of the way Harolds lobes opening and close ramps are designed.

[chiphead]

So I was impressed with the Voodoo 231/239 in that 10:1 400. What kind of power would the Voodoo 219/229/112 make at 9.3 compression with 236CFM of head flow?

[gtofreek]

Originally Posted by chiphead

So I was impressed with the Voodoo 231/239 in that 10:1 400. What kind of power would the Voodoo 219/229/112 make at 9.3 compression with 236CFM of head flow?

Never dynoed that one before, but after seeing how that 231/239 did, I wouldn't doubt it if the 219/227 made 425 HP, and close to 470 Ft. Lbs.