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Old 06-20-2010, 01:48 AM
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another 406

hi ive read quite a few diffrent versions of 406s that people have posted and i had a few questions about building my own so any help would be great and thx in advance.

heres what i have

forged crank

and a set of protopline 235/72cc chambers
10 degree moly retainers, #614-16 10 degree valve locks, #98643 .750 lift Congo roller springs, stainless one-piece chrome stem racing valves, guide plates, 3/8 or 7/16 ARP studs, #SC531 VTO seals.

forged mahle 11 cc dome pistons

i was wondering what cam should i run
am i calculating correct to 13.1 compression
could i run this on e-85

thx again

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Old 06-20-2010, 03:11 AM
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Will require E85 or race gas. Will need long cam to prevent making so much cylinder pressure that you can't keep head gaskets in the motor, in the area of 260 degrees @ 0.050" tappet lift, solid flat tappet or solid roller tappet. Will make power 4000 to 7500, so will need some good parts in the motor. Figured your static compression ratio at 12.73:1. Alternative might be shorter cam with more street-friendly cam timing with copper head gaskets and o-rings. Dynamic compression ratio would be outa-sight.

There must be some roundy-round guys on here that can give you a better answer than I have. Those guys deal with 12.73 and alcohol every Saturday night.
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Old 06-20-2010, 10:55 AM
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You haven't given us enough info on the engine, or the vehicleand weight, and transmission/rear gearing, or the intended us to help you much as far as picking a cam or any other part. Fill in the blanks.
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Old 06-20-2010, 03:32 PM
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going into a 3rd generation camaro. i have a 400 turbo tranny built for up to 1000 hp (dont plan on goin that high but its beter to have more than enough just in case) 9 in rear end build by autoweld specificaly for the camaro

i have a rotating asymb. and everything is forged and h-beam rods

was looking at e-85 as a cheaper alternative to race gas
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Old 06-21-2010, 03:11 PM
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anything else that you need to know?
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Old 06-21-2010, 05:29 PM
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How high do you want to rev it?? What rpm torque peak?? What converter stall?? What rear gear?? 1/4 or 1/8 mile Drag?? Street use at all?? Tire size??

The more info the better.
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Old 06-21-2010, 09:48 PM
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alright. 4:11 gear ratio. going to be running some slicks havent picked any up yet but its the plan. will see street part of the time like a sunday cruizer not everyday. looking to build about 600 hp rev no more than 7000 but i doubt it'll see 7000 too long
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Old 06-21-2010, 10:46 PM
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I'm assuming you want a solid roller as that is what you said the heads are set-up for. Something like 260-264 intake duration, 264-268 exhaust duration @ ,050" (maintain a 4 split between intake and exhaust), .650" In-.630" Ex lift, 108 lobe seperation, installed at 105 intake centerline(3 advanced).
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Old 06-23-2010, 12:04 AM
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do you think that this combo should get me around the 600 hp range?
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Old 06-23-2010, 02:07 AM
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I would expect it to or be very close.
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