Im definitely considering the 200cc heads. 72cc makes the cr around 9.2 so thats about where I want it maybe a little bit higher. I definitely want a lopey cam. So thats my last bit of business.... cam. Still thinking the 230/236 one I mentioned earlier

But I cant find them in angled plugs...

 

Youll want more compression with that cam. Alum. heads assuming?

 

Well I think the jegs just might be in the front spot now.. I've made a chart and so far... the best performing head with angled plugs are the jegs 195cc.. :/ still $1200

Also Ive read on that... I really just want to be able to use pump gas.. like normal pump gas... 93 oct. Not 99 pump. I have no idea where to find that lol. But I thjnk the 64cc combustion chamber on these heads should bump it around 10:1.

And yes aluminum heads.

 

http://www.empirenet.com/pkelley2/DynamicCR.html

http://www.crankshaftcoalition.com/w..._compatibility

http://www.jegs.com/s/tech-articles/...hey+Make+Power

http://www.dfperformance.com/brodix_selection.html

Reading.... reading.... and reading...

This might take a while lol

 

Be patient....measure twice cut once

This will help

http://www.wallaceracing.com/cr_test2.php
know your factory shortblock is probably .025 in the hole. Could be 020 seldom see 030

Someone here will know what the stock piston cc is.

I entered
4.00 bore
3.48 stroke
4.00 gasket size
6cc (this could be wrong just guessing)
.025 in the hole
.028 gasket

9.86 C/R I believe

.020 in the hole gets you 9.90

020 in the hole 6cc piston and 62cc gets you 10.2

 

Stay more like 10:1 with a cam with aluminum. If you want lopey the shelf xfi cam wont do it. Need it on a 108-110 lsa. Or go bigger on duration, or both

230 on a 113 will have some cam sound but really be smoother than what you want

Now you could do an XE lobe with a 1.6 rocker in a 236/242. That be the 288hr i believe. Can get it in a 110 lsa. That be a great lopey cam that will make power to 6200-6300 with good 210 heads.

I would find the jegs heads with flat tappet springs as they are cheaper that way, and buy the right springs for the cam. You will need to with xfi stuff, they are harsh on valvetrain

 

Just a side note, the biggest mistake people make is to overcam an engine. They think the want the loopy idle but they really do not want to live with all the quirks that this presents. Stick with 10:1 compression and the 230 cam it will sound good and still drive well.

I have a 406 SBC in my Firebird with 10:1 compression, 226/226 on a 112 LCA with .555/.555 lift and 200 CC heads. That car sounds good, drives like stock and still puts down 390 RWHP and 440 RWTQ on the chassis dyno. Max power occurs at 5600 RPM and it hangs on past 6200 RPM.

I am all for large cams but I am one of the few people who can tolerate all the quirks. Most people I tune for compain if the car does not drive like stock.

 

Cant have your cake and eat it to i guess. You want power that requires a cam yet dont want it to drive poorly lol i see it too from ppl from time to time

If the OP only wants 375-400 flywheel hp, do small heads and mild cam on 9's to 1 comp. i feel you can make 450+ with out much sacrifice in driving quality, as long as the heads are good sized and you have proper cam events. 400 cubes is alot and needs airflow to run right, but easy to make 1-1.1 hp per cube with mild parts. Like above said, smaller type cams can still make power and drive well, sound good but nothing like a big cam. All depends what you really want. An xfi based 226/232 grind on a 109 lsa would make some great street torque and idle pretty good with that cam chop sound.

 

Would a cam with an lsa like that make vacuum at idle and be streetable? Like I wouldn't MIND (:P) 450+hp its just everything I know about engines is if you get to that kind of power without boost you hurt the drive ability. .. I'm certain that this is old school mentality.

 

I'm running a relatively mild 230 240 .625 lift hydraulic roller in my 406. It's put down a few 10.3x passes.

 

What size heads and intake do you have?

 

Yeah it will make vacuum.

Here are some of my motors.
383 afr 195's stealth ram efi. 400whp thru automatic. 11.47 et 119 mph
230/245 .603/.613 109 lsa. Tuned on stock L98 165 maf ecm. Plenty of vacuum and very streetable despite the incredible nice lopey idle. Check my youtube vids, orr89rocz

401" afr 195 heads, single plane efi, 233/233 .564" 112 lsa. 690whp/ 1000lbft trq on hit thru th400 on 17 psi pig rich tune. Still over 800lb ft up in the rpm band. 9.73 at 142 mph turbo street car. Very docile. Bit of lope but very nice driver. Vids of that too. More vacuum than 383 above

My new bad boy. 401" 245cc speier heads, 246/252 .640 113.5 lsa. Hyd roller. Single plane efi, twin turbos. No figures yet but also surprisingly very driveable. Still good brake vacuum although getting low at 10-12" hg. Doesnt feel soggy, has good bottom end. Should be 8's at 150's-160 mph. Street car driver. Very lopey idle but stable. No issues with auto trans and loose stall below 2000 rpm, drives nice.

Another i tuned. 360" L98 rebuild, stealth ram, afr 190's, 280xfi 230/236 113 lsa. Very choppy idle but summer daily driver in houston hot air and thick traffic. Car ran fine. Valvefloat prevented serious power but managed 330whp at 5600 before float. Should have been 360 whp at 6200-ish. Still ran 12.2 at 112 in warmer air. Despite choppy idle, brakes were good

 

68cc chambers, 202, 160 valves, relatively small runners ported for with good velocity. I was running a SuperRam but now have a miniram. So far, similar times. SuperRam has more low to mid. The mini gains about 1mph and approx .050 to .10 seconds but required a looser converter. May be changing cams soon.

 

what about this crate guy?this what i want to buy
http://www.tristarengines.com/catalo...der-heads.html

 

Crate looks good. Nice street strip cam, not huge by any means for a 406

 

So I called pro-filer. Seem like great heads. But im not sure whether to go with the 2.10 valves or the 2.08. Its only a $25 difference per head. So im thinking 2.10 but... the 2.08 flows 285 @ .6 which is a lot I think.

 

Edit

 

SBC 23 Degree Cylinder Head, 11/32 Guides & Steel Seats*Intake Port Size: 210cc Intake Ports*Chamber Size: 64cc As Cast Chamber*Spark Plug Orientation: Angle Plug*Intake Valves: 2.10/1.600 Valves ADD $something*Spring Package: Standard .650 Lift 1.525 Dual Springs, Retainers, Keepers Assembled ADD $something else
Casting Style: Standard CoolingItem Number: 176

Final go. These are the ones. What do ya'll think? On a 406

 

2.08 is plenty, especially for street 400-500 hp range. Dont need a 2.1 until you really start making hp and rpm. I have a 2.100 valve in my 245 cc heads.

2.08 also lighter and have better chance at control. If you go hyd roller get different springs. Those sound like solid roller springs

 

Otherwise those heads look good with my plans?