I love seeing dyno tests with double humps. I would love to see you swap them out for an entry level aluminum head like IK200 or AFR Enforcer. Probably add 20-30 hp.
I have built about 12 406 engines and they just flat out run. Best bang for buck is this. Stock crank with 6 inch rod and hyper flat tops. Zero deck to make 11.4 with a 64 cc head. Promaxx 215 head Flat tappet lunati 247 255 550 530 on a 106 1.6 1.5 rockers Ported vic jr 850 holly 1 5/8 headers. 555 hp at 6200 540 torque at 4800. Same engine with afr 195 and a comp hydro roller 242 248 extreme on a 110 will make 580 hp and 565 torque.
@dzperformance7360 no problem, I used to build them with the 5.56 rod and I see a good 25 hp just using the 6 inch rod, you can get a good set of rods for cheap now. I have never broke a 400 stock crank even at 600hp and 6800 rpm. As long as the crank has a nice radius they are tough as nails.
very impressive numbers. I have always liked the Camel Hump heads. there were actually 8 different version of them. the 461, 461X and 462 are identical but the 461X had slightly bigger intake runners as cast. and were used on 327 from 62-67. all had 1.94 intake and 1.50 exhaust valves, except the corvette dual quad, and FI motors that got 2.02/1.60 valves. all of these have not holes in the ends of them for accessories and are for short water pumps and short water pump brackets. the 461X was an over the counter / out the back door head for race teams and not installed on factory cars. the was also a 399X head as well but i don't remember if it had double humps or not. there were actually 2 versions of the 291 head 3912291 and 3917291 was used on 327 and 350 and also 302 Z28 Camaro engines. all of these do not have holes in the ends of them for accessories and are for short water pumps and short water pump brackets. the 327 corvette and the 302 z28 got the 2.02/1.60 valves. the 168 head was used on 1969 302 engines, and the 1970 LT1 350 engines. the 186 is similar to the 461X head and has the bigger intake runner and it also has the bolt holes in the ends for long water pump style mounting brackets. there were 2 different 492 heads. the 3991492 cast was used in over-the-counter heads with angle plugs, and similar to the 186 head and has the double humps, 3891492 does not have the double humps. my personal favorite is the 186 head. but there are stupidly expensive since they only came on 69 302 Z/28 and 1970 Camaro and Corvette LT1 350 cars. and restores want them for numbers matching stuff. all that said, every aftermarket aluminum head will out flow the camel humps and the only reason i would use them is if i was restoring a number matching engine or building a marine engine. river/lake and seawater kills aluminum in no time flat. so, hands down Iron for marine use. but even then, there are better iron heads for that. the 906 vortec heads are much better, the old iron bowtie heads are better, the old dart iron eagles are better. i could go on and on about all the better heads. however, if you want the camel hump look on a modern performance head, Trick Flow Specialties has an aluminum replica of the old camel hump heads, and it flow 30 cfm more than the Vortec heads, which are the best flowing factory iron heads. and they are available with or with out the accessory holes on the ends.
Excited to see the results of the 454 zz502/stock 781 setup! I love to see what kind of power people can obtain while using stock heads. Also, very impressed with this little 406, she really pumped out the torque, and nice horsepower too. 💪
We ran a real similar combination in our 406, little smaller camshaft and 1.94/1.50 SS valves. We had it in a Nova and estimated it to be around 450hp. I have a pair of matching date code 462 heads in the garage now waiting for a 355 build. Great numbers on your setup.
Hey Nick,I really enjoy you sharing your build information with dyno numbers.Perhaps you could show us some assembly videos,I think it would be awesome to see all the parts fresh from the machine shop on the bench and then assembled like you do after the dyno with specs..I also like the fact you use mostly GM cast iron in your builds so cool..Thanks again
I know the my AFR heads would blow the double humps away on horsepower and just a small amount more torque but the cool Factor of old school double Hump's can't be beat
The exact answer to your questions no not yet. Just running it on the dyno I enlarge in the holes in the gasket like brodex recommends on their cylinder heads that you cannot get water between the cylinders. But if I was going to drive it on the street I would definitely drill the holes
I really enjoyed your content. Are you planning another test with the 186 aluminum head. I am really curious how they would do on this combination. What did this engine peek at. Thank you.
I really appreciate how fast you respond to questions. I found you thought Eric when he Flowed your 186 steal and aluminum heads.. Ever since i've been really intrigued with both of your contents. You both seem very genuine when you speak. Which makes for great content, keep it up cheers
Yes if you look through my videos I did a 396/408ci that had cast#290,, and a stroker 396/436ci. that also had csst#290's the 436ci set was 1968 with big vales , ,,the 408ci. had stock 2.65/1.72
Cool build- nicely done! Just curious- how are you coming up with 10.3:1? I calculated it with Wallace Racing’s Compression Calculator and kept coming up with 10.69:1?…
I ran the 461 heads on my early 327 engine..2 of the studs started pulling out so had them pinned..ran a big Erson hydraulic cam with TRW forged pistons..Holley Strip dominator intake with 750 double pumper..it was a potent combo for early 1983-1984...I found some 461X heads at the Pate Swap meet outside of Fort Worth Texas right after I built my 327 and got them cheap..just needed cleaning up and hand lapping the valves..sold them for a fair price after my 327 spun a rod bearing. I like this video and will subscribe now.
Cordova! 👍
Never been there because I'm only about 1/2 hr from US41, but definitely heard a lot about it.
Hot Rod Magazine drag week a drag and Drive event the (granddaddy of them all )has been there about three times that was a couple years ago
That little 406 putting out better numbers the 454HO and toe to toe was the zz454 with factory heads. Impressive!
I love seeing dyno tests with double humps. I would love to see you swap them out for an entry level aluminum head like IK200 or AFR Enforcer. Probably add 20-30 hp.
I built those combinations like that a couple times and it makes 520 hp/525
I love seeing those kind of numbers from double hump heads! Very impressive👍🏻👍🏻
Nice 406 Chevy.
Good power and torque.
Sounds great.👍👍
Nice street car engine.
Thanks for sharing
Thank you for the kind words, I checked out your UA-cam channel and it looked like a lot of cool information the barbecue look good also
I have built about 12 406 engines and they just flat out run. Best bang for buck is this.
Stock crank with 6 inch rod and hyper flat tops.
Zero deck to make 11.4 with a 64 cc head.
Promaxx 215 head
Flat tappet lunati 247 255 550 530 on a 106
1.6 1.5 rockers
Ported vic jr
850 holly
1 5/8 headers.
555 hp at 6200
540 torque at 4800.
Same engine with afr 195 and a comp hydro roller 242 248 extreme on a 110 will make 580 hp and 565 torque.
thanks for sharing your combinations
@dzperformance7360 no problem, I used to build them with the 5.56 rod and I see a good 25 hp just using the 6 inch rod, you can get a good set of rods for cheap now. I have never broke a 400 stock crank even at 600hp and 6800 rpm. As long as the crank has a nice radius they are tough as nails.
You’re doing awesome stuff sir. Thanks for the content!
Impressive numbers from such a mild combo…….sounds like the GM engineers just might have understood a thing or two about cylinder head flow!
I did the dart iron eagles on my 406. Great combo
very impressive numbers. I have always liked the Camel Hump heads. there were actually 8 different version of them. the 461, 461X and 462 are identical but the 461X had slightly bigger intake runners as cast. and were used on 327 from 62-67. all had 1.94 intake and 1.50 exhaust valves, except the corvette dual quad, and FI motors that got 2.02/1.60 valves. all of these have not holes in the ends of them for accessories and are for short water pumps and short water pump brackets. the 461X was an over the counter / out the back door head for race teams and not installed on factory cars. the was also a 399X head as well but i don't remember if it had double humps or not.
there were actually 2 versions of the 291 head 3912291 and 3917291 was used on 327 and 350 and also 302 Z28 Camaro engines. all of these do not have holes in the ends of them for accessories and are for short water pumps and short water pump brackets. the 327 corvette and the 302 z28 got the 2.02/1.60 valves.
the 168 head was used on 1969 302 engines, and the 1970 LT1 350 engines. the 186 is similar to the 461X head and has the bigger intake runner and it also has the bolt holes in the ends for long water pump style mounting brackets. there were 2 different 492 heads. the 3991492 cast was used in over-the-counter heads with angle plugs, and similar to the 186 head and has the double humps, 3891492 does not have the double humps.
my personal favorite is the 186 head. but there are stupidly expensive since they only came on 69 302 Z/28 and 1970 Camaro and Corvette LT1 350 cars. and restores want them for numbers matching stuff.
all that said, every aftermarket aluminum head will out flow the camel humps and the only reason i would use them is if i was restoring a number matching engine or building a marine engine. river/lake and seawater kills aluminum in no time flat. so, hands down Iron for marine use. but even then, there are better iron heads for that. the 906 vortec heads are much better, the old iron bowtie heads are better, the old dart iron eagles are better. i could go on and on about all the better heads. however, if you want the camel hump look on a modern performance head, Trick Flow Specialties has an aluminum replica of the old camel hump heads, and it flow 30 cfm more than the Vortec heads, which are the best flowing factory iron heads. and they are available with or with out the accessory holes on the ends.
Excited to see the results of the 454 zz502/stock 781 setup! I love to see what kind of power people can obtain while using stock heads.
Also, very impressed with this little 406, she really pumped out the torque, and nice horsepower too. 💪
On the 406 the torque was really close to what I was looking for ,,,but the horsepower was off by at least 20
We ran a real similar combination in our 406, little smaller camshaft and 1.94/1.50 SS valves. We had it in a Nova and estimated it to be around 450hp. I have a pair of matching date code 462 heads in the garage now waiting for a 355 build. Great numbers on your setup.
Thanks for sharing
Hey Nick,I really enjoy you sharing your build information with dyno numbers.Perhaps you could show us some assembly videos,I think it would be awesome to see all the parts fresh from the machine shop on the bench and then assembled like you do after the dyno with specs..I also like the fact you use mostly GM cast iron in your builds so cool..Thanks again
Since you ask I'm going to do it ,but I'm not really, a how to channel I'm kind of a results Channel, but like I said you ask, ok I'll do it
I got a 406 coming up and a 461 to be assembled I'll do some videos on those
@@dzperformance7360 Thanks Nick I “WE” really appreciate that.I’ll Definitely will be tuning in..
I follow Eric’s channel pretty closely. You did good befriending him 👍🏻
We all need friends,,, and it helps when they know how to Port cylinder heads
Great build, thank you for sharing!
Glad you like it!
HELL YEAH man 2md gen for life. wish there was enough to get one.
I use it as a backdrop so that everybody doesn't see all my junk on the Shelf
Thanks for info. Keep up the good 👍 work RP
Thanks, will do!
Spicy!
Great combination!
I know the my AFR heads would blow the double humps away on horsepower and just a small amount more torque but the cool Factor of old school double Hump's can't be beat
@@dzperformance7360 i have often wondered how great it would have been if GM had built an high performance 400 engine in the 1970!
Really cool
Hey , you got that big block in yet
I was really surprised by the torque number given the cam specs. Shows what I know lol.
Nice job!
Thanks!
@@dzperformance7360 If you where closer, I'd have you check out some 882 heads I just finished.
If you know what you’re doing those double hump heads have the potential to flow extremely well. They are harder than ever to find now though.
In my area the 461 are easy it's the 186 and the 292 that are tough to find,, thanks for watching
My question is the heads drilled steam holes. Great video thanks.
The exact answer to your questions no not yet. Just running it on the dyno I enlarge in the holes in the gasket like brodex recommends on their cylinder heads that you cannot get water between the cylinders. But if I was going to drive it on the street I would definitely drill the holes
built a simular combo in the eighties ext ballance stock rod and aftermarket piston 292 isky hydro std rockers pulled like a train
@@poiter5876 the isky Mega cams. Loved them. And sounded bitchin'. Tighter LSA than comp cams magnum series.
Be cool to see a pair of Vortec Heads on the 406 now or those Crane Heads Eric Weingartner had
Just message him and tell him to send them up to me and I'll do it ,,,he knows my address
Nice setup I built a very similar package. I would select a 770 cfm carburetor the 1000 cfm by my calculations is larger than optimum.
I'll try the 770 next time
Nice 👍
Thanks ✌
Hey I was thinking of a similar combo. What kind of vacuum does that engine have at idle? Thanks
The idol is much smoother than it sounds in the video , the moter is cold on the start up stand
I really enjoyed your content. Are you planning another test with the 186 aluminum head. I am really curious how they would do on this combination. What did this engine peek at. Thank you.
I'm not sure yet. I'm going to wait and see what most of the people ask for
I really appreciate how fast you respond to questions. I found you thought Eric when he Flowed your 186 steal and aluminum heads.. Ever since i've been really intrigued with both of your contents. You both seem very genuine when you speak. Which makes for great content, keep it up cheers
Do you ever do any big blocks with the earlier closed chambered heads? I believe 702 or 063..
Yes if you look through my videos I did a 396/408ci that had cast#290,, and a stroker 396/436ci. that also had csst#290's the 436ci set was 1968 with big vales , ,,the 408ci. had stock 2.65/1.72
Those are semi closed Chambers about 100cc, come to think about it I've never tested on a BBC. cylinder head older than 1968
Thank you for your response
Cool build- nicely done!
Just curious- how are you coming up with 10.3:1?
I calculated it with Wallace Racing’s Compression Calculator and kept coming up with 10.69:1?…
What dome size piston on 454 .070 over engine? Thanks
-26cc
@@dzperformance7360 looks huge like 35 cc lol thanks
They always said the camera adds 9 cc's. lol
No they didn't I just thought that was funny
use to drag race still have 1 set off 461 left 461x was better
I ran the 461 heads on my early 327 engine..2 of the studs started pulling out so had them pinned..ran a big Erson hydraulic cam with TRW forged pistons..Holley Strip dominator intake with 750 double pumper..it was a potent combo for early 1983-1984...I found some 461X heads at the Pate Swap meet outside of Fort Worth Texas right after I built my 327 and got them cheap..just needed cleaning up and hand lapping the valves..sold them for a fair price after my 327 spun a rod bearing. I like this video and will subscribe now.