377 combo ideas - Team Camaro Tech
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post #1 of 10 (permalink) Old Aug 22nd, 03, 07:28 AM Thread Starter
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Jerry
 
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Hello Team!

I was wondering if any of you have and good 377 combo's? Looking to go 11.3's 1/4 mi. And maybe 6's in the 1/8. It's a track only mill, so feel free to throw exotic configurations my way.

One question, It will be NOS'ed. Is a low compression motor better? Like in the 9 - 10.1 compression range better than an 11 plus comp. motor? throw me your ideas!

Thanks!

Jerry - Systems Specialist, IT consultant, Hot Rod Enthusiast -- Searching for a way to tap into the hidden strengths that all stroked SBC’s have. Then one day, an accidental overdose of Camaros.net altered my body chemistry.
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post #2 of 10 (permalink) Old Aug 22nd, 03, 08:56 AM
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Eric
 
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If you can run race gas put some compression to it and go solid roller. 11.3's should be easy in a race only mill on just the motor.

I was thinking . . .

Heads cut to 56-58cc and a flat top piston to make right about 12.0:1. That would leave you a real nice detonation resistant combustion chamber shape and plenty of compression (will work nice with N2O).

Pick a SR cam with duration in the low 290's and duration @ 050 in the mid 250's. Lobe separation for max power NA should stay fairly tight like 106*, but if you are serious about running a lot a juice go with a wider LSA.

Exact cam grind would depend a lot on what heads you start with. Get the best flowing heads you can afford IMO and build the engine around them and a matching cam.

Have fun . . .

E85 racer and E85 carb builder

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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle
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post #3 of 10 (permalink) Old Aug 23rd, 03, 02:52 AM
 
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Eric has some good advice. A 377 will want to rev so good heads are mandatory. Pick the heads, then pistons that work well with the heads and a solid roller cam designed for the remainder of the motor. Use an all forged bottom end with good bolts. Just for kicks, look at the AFR 220 aluminum heads.
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post #4 of 10 (permalink) Old Aug 23rd, 03, 08:55 AM Thread Starter
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Hey Gents...

The AFR 220's are indeed the head we wanna go with. The problem is the SR camshaft. We wanna go with a solid definitely, but not a roller.
Crower had a nice one...grind # 0357

Eric, the LSA is 114 so I think the "juice" will be very nice on it. I'll post the cam specs

Jerry - Systems Specialist, IT consultant, Hot Rod Enthusiast -- Searching for a way to tap into the hidden strengths that all stroked SBC’s have. Then one day, an accidental overdose of Camaros.net altered my body chemistry.
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post #5 of 10 (permalink) Old Aug 24th, 03, 10:18 AM
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Eric
 
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OK, now that you know what heads, what compression, stall and gears are you going to run? Any limitations - parts you already have, etc?

The AFR 220 heads flow roughly 280 cfm at .550" lift on the intake side and about 175 cfm at .600 lift on the exhaust side. The numbers go up only a little above .550" intake and .600" exhaust so there is no need for a .600" plus lift cam.

With a big 220 cfm intake port AFR says your power band will be 4500 - 8500 RPM . . . at least that is what they advertise. The 220's are a hair big IMO unless you really want to rev it.

Also, the combustion chambers are 76cc which means you will need to go with a dome piston or mill the heads A LOT to get the compression you need.

Personally, I would look at the smaller 210-215 cc heads which flow nearly as well (the raised runner 215s actually flow better) than the 220's. IMO you would be really soft on TQ below 4000 RPM.

E85 racer and E85 carb builder

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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle
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post #6 of 10 (permalink) Old Aug 27th, 03, 12:18 PM Thread Starter
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Jerry
 
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Eric.... heres the link to the crower site...

http://www.crower.com/misc/cam_spec/...part_num=00357

I THOUGHT the LSA was 114! I was looking at the wrong cam....

He wants to runs about a 4500 stall, 29" MTS, Locked 4.56 in the rear...

What's it loo like?!

Jerry - Systems Specialist, IT consultant, Hot Rod Enthusiast -- Searching for a way to tap into the hidden strengths that all stroked SBC’s have. Then one day, an accidental overdose of Camaros.net altered my body chemistry.
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post #7 of 10 (permalink) Old Aug 28th, 03, 12:44 AM
 
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Eric is probably right about the smaller heads. I was figuring on an all out drag motor. The smaller heads will definately work better on "dual purpose motor".
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post #8 of 10 (permalink) Old Aug 28th, 03, 10:59 AM
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Eric
 
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That cam is pretty big . . . what again is this motor to be used for exactly?

Its hard to pick a cam without knowing vehicle weight, stall, and gear. Since the engine isn't built yet we can still pick the compression ratio . . . right?

If I were building a 377 for the track ONLY, this is what I's probably do (or in the ball park anyway) -

2800-3000 lb race car, 4.56 gears, 4800-5000 stall, glide trans with brake.

12.0:1 bottom end with FT pistons and small combustion chambers.

AFR 215 heads, agressive solid FT (since you said no rollers) like the Comp 288TLS. Specs are: 288/296 adv duration, 259/266* duration @ .050, .550/.570" lift, 106* LSA.

Super Victor intake, Holley 830 cfm annular carb, MSD ignition with digital 6 box (has window settings for N2O, etc)

Power band would be 4200-7200 RPM. I think the engine would be OK for short trips in town with a very good tranny cooler - but nuttin' on the freeway . . .

I think the combo should be into the high 10's on the motor pretty easily and 9's on the squeeze.

Just my opinion.

E85 racer and E85 carb builder

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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle
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post #9 of 10 (permalink) Old Aug 28th, 03, 07:55 PM
 
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I think the crower grind with the bigger AFR would work great. The 377 is gonna want to spin to 8000 plus with that type of cam.

As for the converter, I would have one of the more reputable manufacturers recomend one. It's gonna be 4500-5000 rpm stall and they can get you a converter tailored to your chasis/motor/trans set up. A race converter is too crucial to just pickup off the shelf in my opinion.
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post #10 of 10 (permalink) Old Aug 29th, 03, 04:33 AM Thread Starter
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Team,

The car will be a race only car. Thats why he wanted the 220 afr heads. do you guys have any other head manufacturer suggestions?

1) They didn't mind using a race gas mill either, so with this cam, is a higher or lower compression beneficial? I say that because they reallllly didnt wanna do alot of cutting on the heads, just the mill work done from AFR. In that case, the 215 heads look to be the best fit. But I need a piston/bore recommendation. I dont think they wanted a dome piston, just a .30 - .40 bore with some deck work.

2) The car weighs approx. 2900 - 3100 lbs with a few pounds to cut off. It has a line lock, transbrake, fuel cell, 4500 stall, 4.56 gears, (they wanna go 4.88)

They wanna stick with the 400 tranny. They swear by it and dont wanna make a change with it. It's gonna be rebuilt, with maybe a few mods for performance sake. Like the pump pistons will be replaced and overbored to allow more fluid, so the trans cooler they have will perform even better. You guys are right on the Stall issue too. With a stall that big, a call to B&M will be in order. Hey Eric, what about that Coan?

Blue 68, do you have any suggestions on a good manufacturer?

They have a Team G intake. Currently a trick 750 Holley. They DID wanna shoot a few more cfm on this, but were worried on a good carb that rates somewhere in the 850 cfm rance that won't kill the little screamer. suggestions?

Well, like I said, I do believe they will be wanting to squeeze 150 - 200 horse shot to wake it up.

Thanks again team!

And Eric, the build hasn't started yet. So compression figures can change at will at this point.

It has a msd system on it too, the only upgrade will probably be the digital retard,

Jerry - Systems Specialist, IT consultant, Hot Rod Enthusiast -- Searching for a way to tap into the hidden strengths that all stroked SBC’s have. Then one day, an accidental overdose of Camaros.net altered my body chemistry.
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