help with sbc 406 - 434
#11
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Join Date: May 2003
Location: Coldwater, MI
Posts: 2,998
Originally Posted by floritejoe
What do you consider a better head (without going to a raised runner or non-23 degree set-up? Just curious what you have used that runs better than 227AFRs on a 427+SBC?.... Thanks.
I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.
Just my 2.5 cents
Just think how good it'd run with the proper heads :P Bigger CI SB motors need better heads to work like they are capable of is what I am saying. I've had the afr 227's on a 434 ran good but surely would of ran a heck of a lot better with a better head.
Originally Posted by hammertime
Originally Posted by floritejoe
Originally Posted by hammertime
406 AFR 227's are not enough head to make a bigger inch small block work @ its peak. I've been this route.
I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.
Just my 2.5 cents
#12
Junior Member
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Join Date: Oct 2006
Posts: 16
Originally Posted by hammertime
Originally Posted by floritejoe
What do you consider a better head (without going to a raised runner or non-23 degree set-up? Just curious what you have used that runs better than 227AFRs on a 427+SBC?.... Thanks.
I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.
Just my 2.5 cents
Just think how good it'd run with the proper heads :P Bigger CI SB motors need better heads to work like they are capable of is what I am saying. I've had the afr 227's on a 434 ran good but surely would of ran a heck of a lot better with a better head.
Originally Posted by hammertime
Originally Posted by floritejoe
Originally Posted by hammertime
406 AFR 227's are not enough head to make a bigger inch small block work @ its peak. I've been this route.
I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.
Just my 2.5 cents
#13
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Join Date: May 2003
Location: Coldwater, MI
Posts: 2,998
Originally Posted by floritejoe
Originally Posted by hammertime
Originally Posted by floritejoe
What do you consider a better head (without going to a raised runner or non-23 degree set-up? Just curious what you have used that runs better than 227AFRs on a 427+SBC?.... Thanks.
I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.
Just my 2.5 cents
Just think how good it'd run with the proper heads :P Bigger CI SB motors need better heads to work like they are capable of is what I am saying. I've had the afr 227's on a 434 ran good but surely would of ran a heck of a lot better with a better head.
Originally Posted by hammertime
Originally Posted by floritejoe
Originally Posted by hammertime
406 AFR 227's are not enough head to make a bigger inch small block work @ its peak. I've been this route.
I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.
Just my 2.5 cents
#14
Build a 421, use 5.7 rods and IGNORE what anyone says about rod ratio. This will give you a more stable piston/pin height. My brother runs one with 867 RR Pontiac heads, not as good as your AFR's, has run 5.61 1/8 (not run yet in the 1/4 but about 8.80's) in a 1900 lb SG Corvette roadster. With a 5000 stall, limit the intake duration to around [email protected], should still run low 9's in the 1/4.
#15
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Join Date: Dec 2005
Posts: 117
AFR 227's
Floritejoe, that's impressive power you are making with those AFR 227's! what kind of fuel are you burning? how much additional work to those heads? are you using giggle juice too? how big is that roller? once again, very nice! inquiring minds want to know..
#16
Senior Member
MASTER BUILDER
Join Date: Oct 2003
Posts: 144
HOLD ON NOW,
the pontiac 867 casting is a good casting.
Depending on whats been done.
I have a set I had redone by Self racing that will flow 360 cfm at .800 on intake and make some impressive power.
these have their port intruders in them.
yer best bang per buck has to be their 18* clone cnc ported setup.
they are oval port, brodix heads with Self racings CNC program.
they flow on intake @.700 aprox. 420 cfm
so capable of 900-950 hp out of a small block
cost with good springs, valves etc. $3400 ASSEMBLED.
VERY GOOD DEAL!
Put those on a stout 434 and a good cam and go racing !
the pontiac 867 casting is a good casting.
Depending on whats been done.
I have a set I had redone by Self racing that will flow 360 cfm at .800 on intake and make some impressive power.
these have their port intruders in them.
yer best bang per buck has to be their 18* clone cnc ported setup.
they are oval port, brodix heads with Self racings CNC program.
they flow on intake @.700 aprox. 420 cfm
so capable of 900-950 hp out of a small block
cost with good springs, valves etc. $3400 ASSEMBLED.
VERY GOOD DEAL!
Put those on a stout 434 and a good cam and go racing !
#17
Senior Member
SENIOR BUILDER
Thread Starter
Join Date: Apr 2006
Posts: 103
406 - 434?
thanks for the info, i sold my 434, i'am looking for heads now. called afr for 227 comp. ported spread port heads, not avalible till june 08. would like 23* heads but i'am looking at 18* i'am building a 40 willys roadster tube chassis all glass body, 22-2300# with driver and i want to run mid to low 9's. still don't know what cu. in., crank, rods, pistons, to build this donovan. thanks again Doug
#18
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Join Date: Jan 2006
Location: La.
Posts: 2,890
Re: 406 - 434?
Originally Posted by bowler
thanks for the info, i sold my 434, i'am looking for heads now. called afr for 227 comp. ported spread port heads, not avalible till june 08. would like 23* heads but i'am looking at 18* i'am building a 40 willys roadster tube chassis all glass body, 22-2300# with driver and i want to run mid to low 9's. still don't know what cu. in., crank, rods, pistons, to build this donovan. thanks again Doug
But back to the question, i think with the block decked that much the biggest crank you'll be able to fit is a 3 3/4" (AKA-406" stroke) The bigger problem i see is the intake manifold, no matter what heads you choose. I think you're going to be stuck useing a fab manifold or a 3 piece stacks injection unit on that block.
The low 9's is easily reached with a 406" at 2200lbs. A friend of mine is running 9.20's in a shoebox 55 chevy @ 2650lbs with a 394" and 23 degree heads an alcohol.
Zip.
#19
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Thread Starter
Join Date: Apr 2006
Posts: 103
406 - 434?
zip glad to here from you, the zoomies need to be narrowed? i'am sure 406 is big enough for what i want to do. i have a gas 1050 dominator afr says their runner is raised 3/16" so i hope i can mill an intake to fit?thanks for the info Doug
#20
Originally Posted by altune
HOLD ON NOW,
the pontiac 867 casting is a good casting.
Depending on whats been done.
I have a set I had redone by Self racing that will flow 360 cfm at .800 on intake and make some impressive power.
these have their port intruders in them.
yer best bang per buck has to be their 18* clone cnc ported setup.
they are oval port, brodix heads with Self racings CNC program.
they flow on intake @.700 aprox. 420 cfm
so capable of 900-950 hp out of a small block
cost with good springs, valves etc. $3400 ASSEMBLED.
VERY GOOD DEAL!
Put those on a stout 434 and a good cam and go racing !
the pontiac 867 casting is a good casting.
Depending on whats been done.
I have a set I had redone by Self racing that will flow 360 cfm at .800 on intake and make some impressive power.
these have their port intruders in them.
yer best bang per buck has to be their 18* clone cnc ported setup.
they are oval port, brodix heads with Self racings CNC program.
they flow on intake @.700 aprox. 420 cfm
so capable of 900-950 hp out of a small block
cost with good springs, valves etc. $3400 ASSEMBLED.
VERY GOOD DEAL!
Put those on a stout 434 and a good cam and go racing !