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Old 05-12-2004, 08:40 PM
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Cool my1st motor... almost done, need advice?

My new engine combo is below, almost ready to put together!

406 small block chevy
holley 750cfm 4160 VC
performer rpm intake
sportsman II heads, 200cc, iron, 72cc angle plug
howards racing springs 1.250" dia. 135# at seat 335# at 1.250"
2.02/1.60 manley street flo valves
10:1 static compression
Lunati 401A5 cam (275/283, 247/255, .530/.550", 106lsa/100intake)
floating hyper. flat tops 030 over on 5.7" 4130 i-beam rods
3.75" stroke Scat 9000 crank
1 3/4" long tube headers
HEI distributor, solid copper core wires, accel shorty plugs

This goes in front of a built turbo 350, and 3.55 gears (25.2" tire) on a 91 octane car.

Since it's my first real power-seeking build, I thoght I'd drop by here for some suggestions and/or advice.

So far, I've got almost everything but the cam, valvesprings, and pushrods. The heads and valves are coming off my previous motor, as well as the 400 block that I am going to punch 30 over.

I was also thinking about some headwork. I've never gotten it done... I had a friend who suggested a better valve job, massage the bowls a little, work the short turn radius, and to port match and step the ports .050"... I know what the others are, but what is meant by "stepping" the intake? He said that it would help reduce reversion on camshaft overlap. How much would a decent shop charge for this kind of work?

Thanks!

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Old 05-12-2004, 09:55 PM
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sounds great, but I will comment on the cam, I think its a lil much...the comp magnum 280 is more than enough...I would strongly suggest a smaller grind..otherwise hey bro, its gonna be an awsome peice!...2wld4u
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Old 05-12-2004, 10:10 PM
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the 247/255 .050" duration is a lot, but i figured that the 276/283 advertised duration would control it... pretty agressive, i know. do you know harold brookshire of ultradyne? it's basically his camshaft brought over to lunati. there was another guy with a motor practically similar to mine, and i just picked the next smallest cam underneath what harold took. sounds logical? yes/no? or?

the other cam i was looking at were the comp XS274 and XS282 solid lifter cams, which comp told me to look at given my compression, stall, and gear to look at. the ultradyne cam above through lunati seemed to be the same thing,just more area under the curve, which is why i amleaning towards the ultradyne/lunati cam.
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Old 05-13-2004, 06:47 AM
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I a pretty much same setup as you and using the bigger 280/284 247/251@.050 525/530 lift 110 LSA 106 Centerline. Now remember this cam is a Solid Cam so to compare it to the HYD you will subtract about 8*. I thing think the 400 is big enough to handle this cam. Most think of a big cam because all cams are grind in general based on a SBC350. The extra cubes will not be as radical as it would be in a 350. Go for it.
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Old 05-13-2004, 10:06 AM
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I know what your saying, how's this sound 406 dish pistons, factory 461 castings..(ported) and the comp cams Xtreme 284 7.78 1/8 mile...3.73:1 rear gear.. I do know what Im talking about....bro......2wld4u
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Old 05-13-2004, 11:50 AM
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Quote:
Originally posted by 2wld4u
I know what your saying, how's this sound 406 dish pistons, factory 461 castings..(ported) and the comp cams Xtreme 284 7.78 1/8 mile...3.73:1 rear gear.. I do know what Im talking about....bro......2wld4u
I think that you are lacking in the head department. 461 heads are 30 year old technology and was great in the old days, but by today standard these heads are a waste to invest money into unless you are matching numbers with your car. The price it cost to get them ported and polished you could have got better heads that will outflow the 461 out the box. Just my Opinon
I have a set on a SBC 283 that I build a decade ago
Just stating the facts, You would see a much better ET with just and upgrade to some better heads. Vortecs, Pro 1, or my favorite AFR.....
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Old 05-13-2004, 01:44 PM
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lol, yeah i agree, this was a build for guy who wanted an old school build...runs on pump gas and runs pretty strong....

that was an example of a combo that worked....I wanted to show it doesnt take a big cam to make power...Im sure his build will be potent but I still think he is over cammed slightly...but thats my opinion...

ofcourse this is based on the assumption that it will be street driven...if this is a non streetable build hey, looks good...2wld4u
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