a429 heads

is there a porter that i can talk with about these heads how good they are
dragweek quickest street rod
2009 2010

There are several good head porters here. What do you specifically need to know? The A429 heads are basically an aluminum version of the old DOOE-R cast iron Cobra Jet head. Good heads that use standard valve layout.

Well, the intake ports are about 20cc's smalller than the D0OE iron CJ's and are more efficient, (but, will flow less maximum CFM). The exhaust side is better.

GOOD, (not great), heads.

Depending on the intended use the A429 heads can be a great choice.
Fantastic choice for a 550 hp build - out of the box.
Also a great choice for a 700+ hp builds ( heads ported - mild reshaping will get 380/260 cfm @ 700" lift )
These are also 800+ HP capable.

If you want 900 HP these are not great heads

heads r old and have been molested do have new manley race master valves. but r not back cut is it worth having them look at and redone or step up to scj that lem sales is there that much to gain
dragweek quickest street rod
2009 2010

You can get little more flow out of the SCJ's, but the biggest gain is in the chamber design. The SCJ's should have at least a bowl blend done to them to realize the potential of the heads. That being said the SCJ's and the A429's require different pistons. If you don't have pistons yet, I would do the SCJ's. If you have pistons already, then it would be a crap shoot for $ spent vs. gain.

When you say they are old, how old, depending on the serial number of them, you could have valve clipping issues with them with bigger cams. The valve clipping issues can be some what corrected, but depending on your cam you might want to go with the newer heads from Lem.

head number r in the 3000 so they r the first version with the valve clipping around .700 lift have been running them sence 1999 but but new valves in last year
dragweek quickest street rod
2009 2010

schmitty wrote:You can get little more flow out of the SCJ's, but the biggest gain is in the chamber design. The SCJ's should have at least a bowl blend done to them to realize the potential of the heads. That being said the SCJ's and the A429's require different pistons. If you don't have pistons yet, I would do the SCJ's. If you have pistons already, then it would be a crap shoot for $ spent vs. gain.

Schmitty,pretty sure the A429 heads use the same piston as a DOVE-C or Iron Cj head.They don't share the valve angle's of the SCJ head.I could be wrong but i think he already has A429 heads on his engine.

Later Mark.

Mark Miller wrote:

schmitty wrote:You can get little more flow out of the SCJ's, but the biggest gain is in the chamber design. The SCJ's should have at least a bowl blend done to them to realize the potential of the heads. That being said the SCJ's and the A429's require different pistons. If you don't have pistons yet, I would do the SCJ's. If you have pistons already, then it would be a crap shoot for $ spent vs. gain.

Schmitty,pretty sure the A429 heads use the same piston as a DOVE-C or Iron Cj head.They don't share the valve angle's of the SCJ head.I could be wrong but i think he already has A429 heads on his engine.

Later Mark.

I think thats what he meant. I assumed he meant the scj and cj use different pistons from each other, and if he has psitons already use the cj, and if he has to but new pistons use the scj......

Here are some numbers that may help you decide the value of ported A429's.

Flowed on 12/22/2000, @ 28" H2O on a 4.6" bore. The heads contained 2.25" IN. valves & 1.76" EX. valves.
IN. flow: 75@.1 / 155@.2 / 225@.3 / 277@.4 / 318@.5 / 338@.6 / 346@.7 / 349@.75 (44 CFM over "out of box" @ .7" valve lift)
EX. flow: 59@.1 / 119@.2 / 173@.3 / 205@.4 / 224@.5 / 240@.6 / 245@.7 / 245@.75 (55 CFM over "out of box" @ .7" valve lift)

Considering the math, these numbers should support close to 700 HP.
Another consideration, these heads were ported over ten (10) years ago. I have been told, these heads contain more performance from additional porting relative to information gained about the A429's port design and capability in the past ten (10) years. There are to my knowledge two (2) designs of the A429. One of the two (2) designs require a smaller intake valve due to "valve clipping" issues. An experienced head porter, such as Charlie Evans, Evans Racing Engines, can offer much more detail than I about the A429's. Another note if I may? The A429's are a good head considering your not wanting to set the "world on fire"! From information I've gathered from experienced head porters and looking over a few shoulders, the Kaase P51 head would be hard to beat on anything short of a max effort race engine!

Just my $0.02 of opinion and my dimes worth of facts!
Happy Motoring,
Dave.

well guys i guess im going to have them flowed and see where they r. like i said they have been molested dont no if port work is good or bad. the bowls r cleaned and and the short side has been worked on plus gasket matched. plus my dinking with them for 10 years in the fall ill get it done and new cam
thanks
dragweek quickest street rod
2009 2010

Mark Miller wrote:

schmitty wrote:You can get little more flow out of the SCJ's, but the biggest gain is in the chamber design. The SCJ's should have at least a bowl blend done to them to realize the potential of the heads. That being said the SCJ's and the A429's require different pistons. If you don't have pistons yet, I would do the SCJ's. If you have pistons already, then it would be a crap shoot for $ spent vs. gain.

Schmitty,pretty sure the A429 heads use the same piston as a DOVE-C or Iron Cj head.They don't share the valve angle's of the SCJ head.I could be wrong but i think he already has A429 heads on his engine.

Later Mark.

Yes sir, the A429's do use the same pistons as the factory iron heads.

I do know if done correctly they will flow 400 cfm

the Coug wrote:I do know if done correctly they will flow 400 cfm

I think I may have had my fingers on the set you are talking about. Impressive to say the least.

schmitty wrote:

the Coug wrote:I do know if done correctly they will flow 400 cfm

I think I may have had my fingers on the set you are talking about. Impressive to say the least.

Where are they and how can I get ahold of them

setting right here within arms reach..........

What ya gonna do with em, beside sit on a shelf?

I was trying to get Freelander's set he picked up cheap, but he up and moved on me. I guess he wants to be closer to Santa Claus.

what flow number would u like to see for a 472 to 514
dragweek quickest street rod
2009 2010

what is the diff between a429 vs a460? I have a pair they have been worked a little I do know they are 2'' taller then ci doove heads. I think I will need around a 9.50'' push rod? I had no idea what they were when I got them cant weight to see what they are about.

quartermileking wrote:what is the diff between a429 vs a460? I have a pair they have been worked a little I do know they are 2'' taller then ci doove heads. I think I will need around a 9.50'' push rod? I had no idea what they were when I got them cant weight to see what they are about.

Everything, except for the fact that they both bolt on the same block. The A429 is basically an aluminum version of the old DOOE-R cast iron Cobra Jet head. The A460 has different intake ports and needs specific A460 intakes, and the exhaust pattern is the same as a BBC.

Not to mention the valve locations are different between the 2 and will need either new notches cut in or completely new pistions.

A429 FTW

kjett wrote:Not to mention the valve locations are different between the 2 and will need either new notches cut in or completely new pistions.

Although this can be done, the fly cuts intersect at a point that is not very good and is not advisable. Better to get new pistons.

Like Schmitty said,they are way different. The A429 is pretty much street/race and the A460 is a preferably Race head that has cousins w/names such as TrickFlow,Idt,and EX514. About the only think interchangable between the 2 are the roller rockers.