jrg77

Thanks for the reply.

As far as the engine is concerned the only things that came OEM with the car that is staying are the A/C, and the A.I.R pump. Heck the whole drivetrain will be replaced by the time I'm done. I would like to run a cat that works with this application.

What happens if I run one of these cams? They are all hydraulic roller.

Crower
LSA - 114
Adv. duration In/Ex - 294/310
Duration at .050" In/Ex - 236/244
Gross lift 1.5 ratio - .540/.565

LSA - 112
Adv. duration In/Ex - 280/288
Duration at .050" In/Ex - 246/248
Gross lift 1.5 ratio - .554/.567

LSA - 112
Adv. duration In/Ex - 288/290
Duration at .050" In/Ex - 250/252
Gross lift 1.5 ratio - .570/.584

LSA - 112
Adv. duration In/Ex - 290/296
Duration at .050" In/Ex - 260/266
Gross lift 1.5 ratio - .585/.597

Lunati
Advertised Duration IN/EX: 284/292
Duration @.050 IN/EX: 230/238
Gross Valve Lift IN/EX: .530"/.530"
Lobe Sep Angle / Intake Ctr Line: 110/104

Adv. Duration IN/EX: 280/288
Duration @.050 IN/EX: 226/234
Gross Valve Lift IN/EX: .530"/.530"
Lobe Sep Angle / Intake Ctr Line: 112/106

Comp Cams
Adv. Duration IN/EX: 288/294
Duration @.050 IN/EX: 236/242
Gross Valve Lift IN/EX: .520"/.540"
Lobe Sep Angle / Intake Ctr Line: 110/106

Hopefully there's enough difference to provide room for discussion.

Thanks,
Jason

Confuzed1

iTrader: (4)

Well, first I'd stop selecting from whatever grinds in the aftermarket ads like above. I just got off the phone with Comp cams, and I'll need a custom gring no matter what retro-roller I get because they say it will have to be a small base circle cam due to clearance issues. I forsee the same thing in your case.

For mine, he recommended a custom grind, 236-242 dur. at .050, .510 int. .530 exhaust lift on a 112 LSA. But bear in mind, I told him I wanted "streetable". For me that meant a reasonable idle, and max power in the 2K-6K range. He claims it will def. be a step up from the hyd tappet cam I have in it now (XE274H).

He thinks the Dart Iron Eagle heads I'm running will be able to handle the additional lift, and I'll only need a spring change. Hope he's right, but I'll have to double check before ordering.

Just thought I'd throw that in since I just got off the phone with Comp.

jrg77

I thought custom grinds were a $1200 affair?

These specs were out of the various online corporate sites.

Our engines do sound similar except for maybe a compression point or two. Are you running a dual plane manifold or single.

How do you like your G Force?

I am aiming for 7000 redline with a 6500 peak HP. The most street I'll be doing is to the highway and back.

Confuzed1

iTrader: (4)

1200 dollar affair?? If it were that much, I wouldn't be doing it, that's for sure lol!

Seriously, the grinding process is all computerized. They punch in the specs and wallah!!....there's your custom cam. They quoted me 309 for the cam plus 95 bucks for springs. I already have lifters and pushrods waiting...

Sounds like your car will be more strip than street, so thier recommendation for your setup will be different all together. I'd think you'd need a longer duration, higher lift, on a 110 LSA at least to make power up top where you'd want it. But call a few places...it can't hurt.

I guess our engines are a little simular - but I wished I'd opted for Dart Pro-1's instead. That way I could've bumped up the compression another point where your at. I'm running a "Crosswind" intake with some port matching and cleanup. It's a cheaper version of an RPM Airgap, but it's only good up to 6K. Anything past that and your in single plane intake territory I'd think. And for a mostly strip car, I'd go solid roller instead.

- And the G Force is holdin up fine!.

jrg77

When I told Comp what I had and what I wanted to do Mike specified one pretty darn close to what you recommended.

Lunati was about the same.

Everyone else was at the PRI show this weekend.

The challenge in going more aggressive is that I am not trailering the car, and it will have A/C, otherwise my wife won't ride in it.

I guess I need to hurry up and get a truck,trailer so I can make this one a bit more of a menace.

The other thing they both said is that the weak point in the valvetrain now is the lifters. I guess they won't hold up to 6500+ rpms and cruise modes.

It kind of sucks, because you see this stuff in the mags and it just doesn't jive with reality.

Jason

Confuzed1

iTrader: (4)

Yeah, I hear ya. I think at least for me, the hardest part of building a car is REALLY knowing exactly what direction you want to end up with it. In other words: street - strip - street/strip.

Hyd. roller lifters will be a limitation at those RPM's. That's why I mentioned going solid roller in your case. At 7K, you'll most likely have valve float using hyd. rollers.

It'll still need to have a stout valvetrain and bottom end to support those kinds of RPM's.....

But you really don't have to spin a 400 that fast to get plenty of power out of it. Heck, there's other 400's making alot more power than mine, and are still "streetable" - at least in thier opinions. Your wife's opinion will most likely differ if she's anything like my wife! lol

My wife doesn't even like sitting in my car. It's "too loud" and jerky and is uncomforatable because it has a hump in the floor - (the CAT converter....

stroker_SS

I thought gingerman was a little bit too narrow for cars, i don't know it's been a few years since i've been their and i was watching go-karts that do 125 mph! I guess thats why they call it wheel to wheel action. I'd like too see your finished product in action so if you can post the dates you'll be racing.

jrg77

I think I am changing back to the idea of running a solid roller cam. It just doesn't make sense to throw the cash in and not get what I want. I mean does it really make sense to get heads this big and not really use them due to the valve train?

Next question: Do beehive springs only work with hydraulic rollers, or does their benefit transfer to solid rollers as well?

jrg77

OK,

I have decided to go solid roller. To that end I have gotten the following parts.
1. Crower Severe Duty Roller Lifters
2. Comp Pro Magnum Roller Roller Rockers.
3. Comp Stud Girdle
4. Crower 280R Cam
LSA - 112
Adv. duration In/Ex - 280/288
Duration at .050" In/Ex - 246/248
Gross lift 1.5 ratio - .554/.567
Ground on small base circle

Should I stay with the Edelbrock Performer RPM Intake Manifold and port match it, or go with the Dart Single Plane Manifold? It will cost the same.

Jason

Sonix

iTrader: (1)

248 duration and .550 lift range doesn't seem like very steep ramp rates for a solid roller.... Is that just me?

You seem to be avoiding the cams recommended by peope in this thread, any reason?

stud girdle and roller rockers, are those 3/8" or 7/16"? I'd recommend the 7/16"...

Confuzed1

iTrader: (4)

jrg77,

I think it's a good choice to go solid roller w/stud girdle. I don't know first hand, but from what I've read the retro roller lifters are heavier than conventional roller SBC lifters and tend to float earlier due to the added mass. I'd guess that's why you need hefty valve springs for control.

Sounds like a good cam profile to me too, but I'm no expert. I'm sure others will comment. I'd think the 112 LSA will help vacuum at idle. I'd say that's the ragged edge of streetable, but again everyone's got a different idea of "streetable".

Hard decision on the intake....My thinking is, for best upper RPM performance at the track, the single plane would shine. Not AS streetable down low, but I used to run a single plane with no problems for years!!

Then again...The RPM air-gap is supposed to be the best of both worlds, but I'd at least port match it. But will it do as well up high as a single plane?? I dunno.

Either way, make sure it can breath with a good exhaust too, and I think you'll have a monster of an engine when it's all done and tuned!! Good luck with the beast!

jrg77

That port matching bit is what made the quandry. It'll cost about $300 either way. My guy at the shop said that it would make number only after 3500. My cam comes in at 2500 - a mismatch.
I guess I am getting the Performer RPM port matched.

I was thinking lemons headers. I might ask them to incorporate a pair of Random Technology converters in the mix so I can at least try and calm the gov't beasts. I will also have to match the oil pan in this process. Moroso has been around for awhile, but I have also heard good things from Canton Racing products.

Still have to do fuel delivery, and cooling, but I'm getting there.

Jason