Which one is better? SBC 406 or 434?

[swb85]

Originally Posted by Marv D

Well OK, maybe a slightly tweaked Uratchko built set of AllPro 345cc raised runner 23° castings, went 374 cfm on Bishcoffs superflow bench and went 376 on my machinist Superflow bench after he touched up the valves this year. (in other words we didn't hurt anything with the new valve angles).

Holee crap a 345cc 23* head??? I'd luuuuv to see the ports on those babies......

[ripdog28]

I hate to say it but, I TOLD YOU SO. those probably flow as good as my 308 darts.

[C20-67_N_MO]

I just bought a pair of Skip White aluminum heads, those are the ones I heard horror stories about. But these are SUPPOSE to be the revised versions and hopefully there are no more problems with these heads.

http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWNX:IT

Also bought some cool looking valve covers to go with them!

http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWNX:IT

So I am excited to see how all this will perform in my 350. And later swap it out to a SBC 406 engine.

[ripdog28]

[QUOTE=C20-67_N_MO;4090196]I just bought a pair of Skip White aluminum heads, those are the ones I heard horror stories about. But these are SUPPOSE to be the revised versions and hopefully there are no more problems with these heads.

http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWNX:IT

I like how the company basicalls said that those heads dont work past 510 lift and acted like they are just for medioker builds. Good luck but after reading their product description, i would think twice.

[C20-67_N_MO]

[quote=ripdog28;4091094]

Originally Posted by C20-67_N_MO

I just bought a pair of Skip White aluminum heads, those are the ones I heard horror stories about. But these are SUPPOSE to be the revised versions and hopefully there are no more problems with these heads.

http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWNX:IT

I like how the company basicalls said that those heads dont work past 510 lift and acted like they are just for medioker builds. Good luck but after reading their product description, i would think twice.

Not sure where you saw that information. But what I gather is this quote:

The springs in this setup are to operate with hydraulic flat tappet cams up to .550 lift.

[ripdog28]

I misread one thing but 488/510 lift was in their post. BUT, why does their flow number comparison say one flow # yet lower in their post of the head components it has a lower flow number? IMO, something updated from 2008 is not a new updated thing. THE BIGGEST KICKER, Why do they have .550 lift springs yet they show a flow chart with .600 and .700 lift numbers? They have too much info that comflicts if you read it more.

Also, why does every other Alum head company charge 2x what this company does? not just workers pay, possibly quality?

[1Bad62Pro/Street]

Chevrolet 406 Big Block - The Impersonator
Big-Block Torque In A Small-Block Package
From the June, 2003 issue of Chevy High Performance:

http://www.chevyhiperformance.com/te...que/index.html


434 Stroker Build - W-Engine Revival - Part Two
Transform That Tired 348 Into A Tire-Smoker
From the August, 2009 issue of Chevy High Performance:

http://www.chevyhiperformance.com/te...ild/index.html

[C20-67_N_MO]

Originally Posted by ripdog28

I misread one thing but 488/510 lift was in their post. BUT, why does their flow number comparison say one flow # yet lower in their post of the head components it has a lower flow number? IMO, something updated from 2008 is not a new updated thing. THE BIGGEST KICKER, Why do they have .550 lift springs yet they show a flow chart with .600 and .700 lift numbers? They have too much info that comflicts if you read it more.

Also, why does every other Alum head company charge 2x what this company does? not just workers pay, possibly quality?

On the springs they come with what is good up for Hyd. flat tappets to cam lift of .550. You can always upgrade the springs for higher lift and I am sure thats what the information you read was all about. The .488/510 thing was something I posted.

For the money these are descent heads. Sure they are not AFR's but I just can't afford those right now either.

Should work fine on my application under I get the bug for more horsepower.

[Marv D]

Originally Posted by swb85

Holee crap a 345cc 23* head??? I'd luuuuv to see the ports on those babies......

holee crap me too swb (ROTF,,, I just caught it) ,, talk about big ol pfhat fingers and blind! how about 245cc not 345. Someone bit*h slap me whan I do that will ya!!!!!!!!!!!!

[ripdog28]

They still flow like big dogs. all that matters.

[Marv D]

Not trying to hikack the thread, but Ripdog are you running slicks and hooking up. I'm curious to know how the Detroit locker is holding up to that much torque. I'm changing my truck around some and will be throwing 660hp/580tq at a 9" with Detroit locker with a transbrake launch (was stalling the converter dead at the torque peak, but we'll see where it flashes with the new combination)
I've got a stupid amount of rubber on the back and could make the thing dead-hook with 500HP, but opted to take a little hit out of the 4-link and be easier on the old TH350, mild steel shaft etc. It's a Dyneer "No-Spin" Detroit locker w/ 33 spline Dutchman axles. I'm just unsure of what the locker is going to tolerate. If you've been launching a with the torque listed in your siggy,, I should be OK. Still going to drive this thing on the street is the only reason I'm not dumping the locker for a spool.

[68 C-10 KID]

C20-67_N_MO
Have you looked @ what a warmed over set of Vortech heads flow compared to the heads you bought.
Just asking. A friend and I built a 6" rod 406 sbc solid tappet motor W/ the VT heads for his dads 63 short box and that thing was a bruiser. It would click off high 12.70's every time at the track.
To keep the cost down a little trick you can do is drill the rocker arm studs and bosses and press in roll pins.
Marv I'm so jealous of your heads. Those make my AFR 227s look amateur.

[C20-67_N_MO]

Originally Posted by 68 C-10 KID

C20-67_N_MO
Have you looked @ what a warmed over set of Vortech heads flow compared to the heads you bought.
Just asking. A friend and I built a 6" rod 406 sbc solid tappet motor W/ the VT heads for his dads 63 short box and that thing was a bruiser. It would click off high 12.70's every time at the track.
To keep the cost down a little trick you can do is drill the rocker arm studs and bosses and press in roll pins.
Marv I'm so jealous of your heads. Those make my AFR 227s look amateur.

No I really haven't.

Got Vortech heads and intake on my truck right now. So with this set I just bought hoping it will perform better than whats on it currently. Also have a flat tappet .488/.510 hyd. cam I am running with a two-plane intake and the same Holley carb that is currently on the vehicle.

Just going to play with this setup before building up a nice 406 setup. I've heard they make some VERY high torque, very close to BBC numbers. So I can't wait to find that out even though it will be a while for that to happen.

[68 C-10 KID]

Nice. Don't let any one talk you out of building a 406 6" rod motor. They will run great for street and strip.

Here are some of the cast numbers to look for, these are 4 bolt and 2 bolt hi nickel blocks. 817,511,509.

Marv is dead on as always on the spayed 4 bolt set up on the money spent for the caps and machine work compared to the aftermarket Motown or Dart blocks.

The stock blocks are only going to be as good as the machine work. Make sure you have deck plugs put in the block. This will help with cylinder wall strength. If a guy wants to get a little radical he can also block fill up to the bottom of the freeze plugs. If this is done you should run a synthetic oil. The synthetic oil has a higher operating temp rang.

Remember that none of us are rich$$$$. So if we have to save a little more and build it a little more bad ass it going to cost less money down the road. Enough is never enough. We always want more.

[C20-67_N_MO]

Originally Posted by 68 C-10 KID

Nice. Don't let any one talk you out of building a 406 6" rod motor. They will run great for street and strip.

Here are some of the cast numbers to look for, these are 4 bolt and 2 bolt hi nickel blocks. 817,511,509.

Marv is dead on as always on the spayed 4 bolt set up on the money spent for the caps and machine work compared to the aftermarket Motown or Dart blocks.

The stock blocks are only going to be as good as the machine work. Make sure you have deck plugs put in the block. This will help with cylinder wall strength. If a guy wants to get a little radical he can also block fill up to the bottom of the freeze plugs. If this is done you should run a synthetic oil. The synthetic oil has a higher operating temp rang.

Remember that none of us are rich$$$$. So if we have to save a little more and build it a little more bad ass it going to cost less money down the road. Enough is never enough. We always want more.

6" Rods huh?

For whatever reason I was told to use the 5.7" rods for this setup.
Yeah I had a nice 509 casting block but had to do some trading and let it go. But I am looking forward to building one after I trash this 350 thats in my '72 right now. lol

[1Bad62Pro/Street]

Since we are on the subject.......
NC--1970 Chevy 400 cu in SB,
Casting 3951511 Canadian Block
1Bad62Pro/Street
http://67-72chevytrucks.com/vboard/s...d.php?t=408630

[swb85]

Originally Posted by Marv D

Not trying to hikack the thread, but Ripdog are you running slicks and hooking up. I'm curious to know how the Detroit locker is holding up to that much torque. I'm changing my truck around some and will be throwing 660hp/580tq at a 9" with Detroit locker with a transbrake launch (was stalling the converter dead at the torque peak, but we'll see where it flashes with the new combination)
I've got a stupid amount of rubber on the back and could make the thing dead-hook with 500HP, but opted to take a little hit out of the 4-link and be easier on the old TH350, mild steel shaft etc. It's a Dyneer "No-Spin" Detroit locker w/ 33 spline Dutchman axles. I'm just unsure of what the locker is going to tolerate. If you've been launching a with the torque listed in your siggy,, I should be OK. Still going to drive this thing on the street is the only reason I'm not dumping the locker for a spool.

Dunno if he answered you yet or not Marv, but I ran a detroit locker in my camaro for 2 seasons. It's a clutch car, 3900lb race weight (I know) and makes ~650-700rwhp on the jug. Left on the 2-step at 6500-7000rpm and it never skipped a beat. Put in a spool this year when I narrowed the 9" and the locker looked new still when I pulled it. I don't think you'll have any problems.

[ripdog28]

Originally Posted by swb85

Dunno if he answered you yet or not Marv, but I ran a detroit locker in my camaro for 2 seasons. It's a clutch car, 3900lb race weight (I know) and makes ~650-700rwhp on the jug. Left on the 2-step at 6500-7000rpm and it never skipped a beat. Put in a spool this year when I narrowed the 9" and the locker looked new still when I pulled it. I don't think you'll have any problems.

I sent Marv a PM but Currie Ent told me they are good for 800+hp when i bought mine.

[hotrod 80]

I will be going Detroit locker also so this is good info .