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Old 02-11-2005, 03:27 PM
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Help me design a 400 SBC around this camshaft

I sent my solid roller cam to Comp to get profiled here's what i got.
254 Intake duration @.50
254 exhaust duration @.50
420 Intake lift lobe (also said 630?)
418 exhaust lift (also said 627?)
105 lobe seperation
Here's what i got so far 400 2bolt main bored 40 over,stock crank and rods,dished pistons,750 Holley dominator carb,Team G Weiland single plane intake,3500 stall converter,TH350 transmission,4:10 12 bolt rearend,set of solid roller lifters,I want to end up with somewhere around 10:1 compression,so my main question is what heads do you reccomend?They also said they (Comp)cound not regrind this cam.This motor is going in a 69 Camaro for street use.Please Help!!!!!!!

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Old 02-11-2005, 03:39 PM
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Get a new camshaft or a new rotating assembly with all forged components.

10-1 compression will not work very well with that camshaft, 11.5-1 or better aspecially with aluminum heads.

That 3500 rpm converter is a little on the tight side for the camshaft in a 400.

You'll also need heads with 215cc or larger ports to get to the rpm range that the camshaft will work best in.


Larry
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Old 02-11-2005, 04:33 PM
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combo

Quote:
420 Intake lift lobe (also said 630?)
Is it a .420 or a .630?

The 105 lobe separation may not run power brakes.
I don't understand your cam numbers. So I cannot suggest head runners or stall.
Dished pistons with a 64cc head will give you 9.8 to 1 compression.
Flat top piston with 70 cc head will give you 10.8 to 1 compression.
Tricky part; 64cc head flows better than the 70cc head. I have emailed head manufacturers and talked to speed shops about this. Head manufacturers suggest going with the flow. Speed shops say go with compression. Your choice.
Stock crank is fine for street.
Stock rods, pistons, and tranny? Somethings going to break.
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Old 02-11-2005, 05:13 PM
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He's refering to lobe lift and lift seen at the valve. Either way I think it's too radical to be cinsidered for a street car.

Larry
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Old 02-11-2005, 05:28 PM
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Ditch that cam. It's not for street use, unless it's a trailer queen that only goes to the strip or for making a bunch of noise in the driveway.


Brian
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Old 02-11-2005, 05:29 PM
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630 lift

I would have to agree, .630 lift is too big for the street. I have a 454 with a .600 and it's pretty radical on the street. I only drive it to and from the track. I have other rides that are more fun on the street.
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Old 02-11-2005, 11:47 PM
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That lift will take 240 on the seat and 600-625 open pressure for springs. So your looking at monthly valve inspection and yearly teardowns to inspect the solid rollers. Most likely a couple or more will need replacement. You'll also want to inspect the springs every year for fatigue. It can be done and I do it every year but if your not hard core you won't find it enjoyable.

That 105 LSA is a bit silly for the street as well, too tight.

If you do keep that cam then from a head standpoint you will want something with an excellent exhaust port and also something that flows well into the .700 range. Even though you don't lift the valve that high you want a head that will still be flowing well at that level. Something like an AFR 227 raised runne or, Brodix 18X. For springs you'll want something on the order of Isky Tool Room gold stripes. Get out around $600 just for those. With the spring pressure you need you don't want to low ball the springs.

Compression will need to be in the 11.5 range.

Don't know if that all makes sense to stick into a stock bottom end motor though it would be fun for awhile.
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Old 02-12-2005, 04:41 AM
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Thanks for the knowledge,guess i will toss the cam, what if i got their xr286r part#12-772-8
(weekend warrior) cam and used my solid roller lifters?How would Vortec heads work on this combo?What head would work better?
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Old 02-12-2005, 06:42 AM
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Something to help figure a cam

http://www.smokemup.com/auto_math/index.php
http://cochise.uia.net/pkelley2/index.html
http://members.uia.net/pkelley2/DynamicCR.html
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Old 02-12-2005, 08:27 AM
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Good idea to toss that cam. Big cams usually just make for a dog on the street. Get a mild cam and spend your money on heads for good street power. There have been alot of threads on heads lately. Search and you will find alot of facts and probably more opinions.

Chris
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