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Old 03-19-2008, 07:00 PM
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406 combo, your thoughts

tell me what you think of this combo

406 sbc
3.75 stroke
5.7 rods
flat top pistons (speed pro forged)
comp cams xs274s 236-242 @.050 .501-.510 lift 110/106
edelbrock performer rpm airgap intake
750 dp holley
AFR 195 eliminater's, 75cc chambers, 2.05-1.6
comp cams 1.52 roller rockers
10.40 compression
1 3/4 headers (hooker 2242)
3500 stall
350 turbo
3.42 gears
275/60-15 tires
85 ss monte carlo 3,500 lbs

any thoughts?

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Last edited by 406 ss monte; 03-22-2008 at 03:19 PM.
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Old 03-19-2008, 07:13 PM
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Looks pretty good to me.
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Old 03-19-2008, 07:51 PM
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Quote:
Originally Posted by 406 ss monte
tell me what you think of this combo

406 sbc
3.75 stroke
5.7 rods
flat top pistons (speed pro forged)
comp cams xs274s 236-242 @.050 .501-.510 lift 110/106
edelbrock performer rpm airgap intake
750 dp holley
AFR 195 eliminater's, 75cc chambers, 2.05-1.6
comp cams 1.52 roller rockers
1 3/4 headers (hooker 2242)
3500 stall
350 turbo
3.42 gears
275/60-15 tires
85 ss monte carlo 3,500 lbs

any thoughts?
Should be ok, but watch your total timing. That cam with 9.25:1 or so will be sensitive to too much total advance. Try limiting it to no more than 34 all in at 2,500 rpm.

tom
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Old 03-19-2008, 08:13 PM
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i figure the compression to be 10.41-1. 75cc chambers, 3.40cc valve releafs, .038 x 4.200 head gasket, .005 down in the hole. am i going to run into trouble with that cam & the compression? what should be done? thanks

Last edited by 406 ss monte; 03-22-2008 at 03:20 PM.
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Old 03-19-2008, 09:17 PM
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I bet that engine would handle a little more cam-something in the 240@.050 on the intake side. Also, don't the AFR 195's have an excellent intake to exhaust flow ratio? Maybe a single pattern cam would work better. The heads would also like more lift-.501/.510 isn't much area to take advantage of what those heads have to offer. JMO-maybe I'm way off base....
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Old 03-19-2008, 11:09 PM
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Quote:
Originally Posted by 406 ss monte
i figure the compression to be 10.28-1. 75cc chambers, 5cc valve releafs, .038x4.200 head gasket, .005 down in the hole. am i going to run into trouble with that cam & the compression? what should be done? thanks
OOPs, my bad. I had in my head an engine I did a few years ago that was identical except it had dished pistons and and XE274 cam I'm sorry. That XS274 will probably be OK with the aluminum heads, but I think badbob is on the right track about using a little more cam instead.

tom
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Old 03-20-2008, 08:23 AM
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I say.......

too much stall. 2600 to 2800 should be fine with that cam

not enough gear. 3.73 would be ideal

header tubes too big. 1-5/8 would be better

No need to use more duration on the exhaust side with those heads.
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Old 03-20-2008, 03:57 PM
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i can have my stall speed changed.

3.73 gears would be better, but to be honest i've ran 3.73 & 3.42 gears & there isn't much at all difference imo.

why would the 1 5/8 headers be better? better torque?

what cam? the only single pattern cams i've seen is the comp cams magnums.
i want a solid lift cam.

i have comp cams 1.52 roller rockers, i could sell them & get some 1.6 rockers. i've thought about that too.
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Old 03-20-2008, 04:34 PM
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yes, better torque with the 1-5/8. Don't think you are at the point of needing 1-3/4 yet.

yes, the magnum cams are a single pattern. The 280s has 230/230 degrees at 0.050". However, the xs series have faster ramps than the old magnum cams. Faster ramps make more power but tend to wear quicker. The xs274s only has 6 degree more on the exhaust so it isn't that bad.
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Old 03-20-2008, 04:41 PM
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Comp should have a single pattern solid cam in the 240-245ish@050 range with over .500 lift or you could use 1.6 rockers. In a 406 I see no reason to go any smaller unless you're running really low compression. A 406 swallows a cam this size like nothing and still makes plenty of torque for daily driving. A 292H (240@.050)made enough low end torque in one 406 I built that you could actually start from a stop in 3rd gear and this was with a Muncie and 3.08 gears in a 67 camaro with less compression than yours. Definately keep the 1 3/4 headers (if the rest of the exhaust system is efficient) because there's no performance gains going smaller-I've seen this with 350 engines also with more power from idle all the way up with the larger primaries. Another thing you should consider-call AFR and I bet you'll get some great cam recomendations and also thier confirmation on header size for those heads.
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Old 03-20-2008, 06:37 PM
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i'm running a lunati 249-259 @.050" lift .543-.561 on a 106/104. i sold my dart 215 pro-1's in favor of getting the 195 afr's. they out flow the darts all around. the short block is still in the car. the 1 3/4 headers, 3500 stall, & 3.42 gears are part of my combo from that build. i have 3" pipe to the rear end going through terminator mufflers. the car is (was) plenty strong on bottom end. i just wanted more. it wont hurt me a bit to run this cam. it sounds great & runs good. i just never turn it over 5,500 rpm & thought i might be better going a lot smaller.

my pistons are speed pro L2489F30. i was off on the valve relief size. it's 3.40cc's which will make my compression 10.41.

Last edited by 406 ss monte; 03-21-2008 at 04:32 PM.
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Old 03-22-2008, 03:25 PM
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anybody? any suggestions?
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Old 03-22-2008, 09:00 PM
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Sounds good to me, would be nice to have a little lower gear to help that converter with the weight of the car.
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Old 03-22-2008, 10:34 PM
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what intake should i use? i have an edelbrock victor jr, weiand team G, & a edelbrock rpm airgap?

f-bird, is their a better cam for my 406 than what i have?
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Old 03-23-2008, 11:24 AM
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drivability is no concern

the cam was degreed in. i think 102 or 104, i don't remember.

the only time i had it to the track was on street tires. it spun past the 1/8 mile mark in third gear. it had 3.89 gears in it then. the best it ran was when i left it in drive, spun straight into third before the 60 ft mark & it ran a 13.32 in the 1/4 & 8.55 in the 1/8. it actually feels a lot better with the 3.42 gears than it did with the 3.89's.

i sold the dart 215cc heads because i felt they was hurting more than they was helping. those big runners are meant for a lot of rpm, i wasn't turning it but 5,500 rpm so i thought a smaller head would be better. the 195 should be an all around better choice. i was also thinking with the higher 3.42 gears that the smaller xe274 would be a better choice. i would like a 244ish on in & ex with about .550 lift on a 110. that way i can run a little nitrouse too. i feel the xe274 is a little small on the intake side, but would rather error on the small side.

i was thinking of a comp cams magnum 294s 248-248 @.050 .525-.525 110/106

i'm getting ready to knotch my frame rails so i can run a 325/50-15. i will have to go with a 3.73 or 4.11 then.
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