Cascade Crew

mrpopo573 · Posted: Fri Feb 24, 2006 2:28 pm Post subject: What would I run WWIR

Hello guys, quick question to help slake my thirst for my crate motor. This is one of those wonderful questions so indicative of my import "friends."

BUT nonetheless I am curious as to what my new motor combo should put to the wheels and in the 1/4, all estimations of course. I won't be suing anyone after I run a 15. Mad

New motor, in a vague way, is somewhere around 340 hp, lt4 hot cam, full roller, 9 3/4:1 compression. Full length headers with true dual exhaust exiting before my tires. HEI ignition, 8mm wires, blah blah blah. My motor guy plans on using my 305 heads, ported and polished to bump up compression. Might not go for it and get some zz4 type heads. I know this isnt a full plate of info, so please feel free to add your advice in parts and upgrades and what you think it will give me at the tire and such.

It will be traveling through a 700r4 (converter/stall upgrades going in with motor) out to a temporary open diff with 345's inside.

Thank you all in advance for your help. Here's to wearing the tutu at cows!

chevymad · Posted: Fri Feb 24, 2006 6:37 pm Post subject:

This is all just guessing of course. But going by the other combo's i've seen. I'd say 285hp rear wheels and 13.4@102 maybe.. Thats with the better heads. Hot cam seems kind of small from my one experience with it in Mikes L98. Also I don't think either of those heads will give you you're full potential. Now if you got trickflows, jegs/canfields, afr, brodix, dart,l or even pro's you might make the 300hp mark and be knockin on 12s.

Twilightoptics: 355, solid lifter cam, protopline 200cc heads, HSR, th350, 3.73s, headers, dual 3" exhaust.. 311hp and 13.01@107

Rjmcgee: 355, xe274, protopline 200cc heads, performer rpm, demon carb, headers, banks exhaust, 5spd, 4.11s... nearly the same hp and times as paul, maybe just behind.

John just switched from swirl ports to ported 416s this year. Though he did gain in the upper rpm's he really didnt gain a huge amount. 230hp with a 305, I think. With the swirls and giggle juice he was running right with the other 2.

These are the main ones I'm comparing to. The most similar combos. Mike had a l98 hotcam combo but it didn't last long. His 383 combo makes quite a bit more power but has yet to hook it up. What was that again mike? 14.6@116?? lol Razz

My suggestion to you is the same I told Mike when he started. Get the best base you can afford. Forgings etc. You'll always want to add more power. You don't want to be limited by bad pistons or weak rods. From there the most horsepower is going to be in the heads/cam.

Which intake you going to run? This will make a big difference too. If you're running stock tpi i'd probably even lower my estimates.

The worst thing you'll find out with these 3d gens. Once you start making power everything will need to be replaced. You'll go through tranny's, then rear ends, suspension etc.. GM only built this thing just tough enough to hold the stock motor.

iansane · Posted: Fri Feb 24, 2006 7:07 pm Post subject:

You're not planing to stick with the TBI are you?

mrpopo573 · Posted: Sat Feb 25, 2006 12:07 am Post subject:

Thank you both for the replies.

To answer a few things, because of my flame job i cant get rid of the stock hood, so a dual plane EPS edelbrock manifold with a 650+ carb is going to be my setup there.

TBI? God no. I stare at a 350hp 56 210 del rey everyday, along with my dads 425hp twins, the 2 1968 442 Convertibles. EFI fits my age group but not me.

The head advice was excellent, my father who has his motors built at the same shop has had a great experience, and I have been really concentrating on getting the best of internals, not the biggest.

Is the LT4 hot cam too small? I am planning on better heads when the cash comes in, but for the motors life span, I won't be adding any more power to her, only tweaking air intakes, maybe carbs, and exhaust. So maybe a bigger cam won't be needed for a 285-300whp motor?

Twilightoptics · Posted: Sat Feb 25, 2006 11:41 am Post subject:

chevymad · Posted: Sat Feb 25, 2006 12:12 pm Post subject:

Since you're going carb, I'd definately run something different then a hotcam. That cam is set up for EFI and there are several things you can get away with on a carbed setup for more hp. Right now i'd be looking at a Voodoo or XE cam in the 274 range.. If you want a more daily type ride 262-268. This is for the 9.5:1 to 10:1 compression range.. More compression means you can run more duration. Tighter LSA's will work on carbed setups to make more hp, but will be more peaky. Remember too that any cam you pick out will require the matching convertor and gears.

mrpopo573 · Posted: Sat Feb 25, 2006 12:30 pm Post subject:

this is awesome. Thank you so much guys!

All this info is definetly helping me be better prepared for the future with a newer motor.
And the point about the LT4 being an EFI related cam was great info I didn't even think about.

Thanks again! Please add anything else if you think of it.