429 issues !!

we have a  .040  over 429   in our 57  ,car weighs  3750   at the starting line  .  
 the motor  has the stock  crank  . eagle rods and   some ole JE  flat tops  11.5.1  
has some  ported  scj heads(  .385 cfm at .700 lift)   and a 4150 supervictor intake
has a custom ground  bullet  solid roller   .738/.748    .266/.277  @.050   .  
and a quickfuel 950  carb  ...   3.89  rear gear on a 275/60 mickey pro radial  
c-6 trans  with a  9.5" converter   4000 rpm  stall
has  msd digital 7 ignition  and hvc2 coil , magnafuel prostar  500 pump and  magnafuel regulator and all supporting  fuel line  
 .. .. I really had  high hopes for this motor   but the best  I have netted out of it  is a  12.00 at 110 mph  it has a slight miss about 6000rpm but cleans  up and revs  out too  7200  or so ( at least that's where ive been shifting ) ... the  car  ran  better with a  smaller cam  and  iron passenger heads   11.76  116 mph  ...  I guess my  question  is    does anyone see anything   way  out of place   besides the compression  being on the lower end .?

First thing I see is carb. size. I'm thinking it needs more.

You need to put some inches under those heads, the motors too small for the weight and big heads.

Put a 4.300 or a 4.500 stroker kit in it ant it will run. Or go back to the small cam and heads.

Pretty much everything you have already noted. Bigger , ported heads, too much camshaft, and not enough gear. 7,200 with a 275 and 3.89 gear should be 120+ mph. Your finish line HP at the rpm you're at for 110 mph is under 400. All the changes were for more hp at a higher rpm but the gear won't let you get there. Try a 4.57 if it's easier than going to a smaller cam.

linearfab wrote:we have a  .040  over 429   in our 57  ,car weighs  3750   at the starting line  .  
 the motor  has the stock  crank  . eagle rods and   some ole JE  flat tops  11.5.1  
has some  ported  scj heads(  .385 cfm at .700 lift)   and a 4150 supervictor intake
has a custom ground  bullet  solid roller   .738/.748    .266/.277  @.050   .  
and a quickfuel 950  carb  ...   3.89  rear gear on a 275/60 mickey pro radial  
c-6 trans  with a  9.5" converter   4000 rpm  stall
has  msd digital 7 ignition  and hvc2 coil , magnafuel prostar  500 pump and  magnafuel regulator and all supporting  fuel line  
 .. .. I really had  high hopes for this motor   but the best  I have netted out of it  is a  12.00 at 110 mph  it has a slight miss about 6000rpm but cleans  up and revs  out too  7200  or so ( at least that's where ive been shifting ) ... the  car  ran  better with a  smaller cam  and  iron passenger heads   11.76  116 mph  ...  I guess my  question  is    does anyone see anything   way  out of place   besides the compression  being on the lower end .?

Most of that combination can work fine as I have sorta used that recipe myself several times but, the cam is WAAAYYY to big for that application. It may be OK with using a FOUR.89 rear gearset and a 7,800 capable valve train.

My "alternate" Engine Masters entry this year is 450 inches with that head, compression and QuickFuel 4150 carb which makes almost 700 horsepower with a much smaller Hydraulic lifter flat tappet camshaft.

guess ill have to swap gears . its frustrating to hear the cam is wrong esp when it was spec'd by bullet and ground for that set up. what about putting n02 on it and sprayin the shit out of it?

Do older JE flattop 429 pistons have a thick enough top/crown to convert them into zero deck 460 pistons? If so it could be a low buck way to gain some cubes by swapping in a 460 crank & modifing the original JE pistons & re-using the OEM length Eagle rods.

linearfab wrote:guess ill have to swap gears . its frustrating to hear the cam is wrong esp when it was spec'd by bullet and ground for that set up. what about putting n02 on it and sprayin the shit out of it?

If it is a roller cam, just put your smaller camshaft back in it.

I am presuming that you did re-notch those pistons to accommodate the different SCJ valve placement.

I no the pistons are super thick thats why we hung onto them . The old cam was solid flat tappit.we sold it a while ago .. and im not sure on the pistons being renotched . I dont think they wher

If i was to pull the motor and make this thing a stroker. What. CI would u guys recommend ?

linearfab wrote:we have a  .040  over 429   in our 57  ,car weighs  3750   at the starting line  .  
 the motor  has the stock  crank  . eagle rods and   some ole JE  flat tops  11.5.1  
has some  ported  scj heads(  .385 cfm at .700 lift)   and a 4150 supervictor intake
has a custom ground  bullet  solid roller   .738/.748    .266/.277  @.050   .  
and a quickfuel 950  carb  ...   3.89  rear gear on a 275/60 mickey pro radial  
c-6 trans  with a  9.5" converter   4000 rpm  stall
has  msd digital 7 ignition  and hvc2 coil , magnafuel prostar  500 pump and  magnafuel regulator and all supporting  fuel line  
 .. .. I really had  high hopes for this motor   but the best  I have netted out of it  is a  12.00 at 110 mph  it has a slight miss about 6000rpm but cleans  up and revs  out too  7200  or so ( at least that's where ive been shifting ) ... the  car  ran  better with a  smaller cam  and  iron passenger heads   11.76  116 mph  ...  I guess my  question  is    does anyone see anything   way  out of place   besides the compression  being on the lower end .?

get rid of that carb,and camshaft,put a 4500 dom on it.


nothing wrong with iron heads, they can be fun

Im not gunna down grade the motor . Id rather make what i have work than go back to iron heads and a smaller cam . When i have a fortune in all of this and. The iron heads wher sold along time ago .

linearfab wrote: Im not gunna down grade the motor . Id rather   make what i have work than  go back to iron heads and a smaller cam . When i have a fortune in all of this and.  The iron heads wher sold  along time ago .

How's it a downgrade if it goes faster? What you have ain't going
To work together with out a bunch of changes.

Not against ditchig that carb either . That was in my list for winter changes. . It might go faster but its still not were i want it to be . I wouldnt of spent the money i did to run the same . If makin it 521 ci is what it has to be to haul ass then i guess thats what ill have to do .

linearfab wrote: Not against ditchig that carb  either . That was in my list for winter changes.  .   It might go faster but its still not were i want it to be .  I wouldnt of spent the money  i did to run the same .   If makin it 521 ci is what it has to be to haul ass then i guess thats what ill have to do .

while your at it build big.parts cost the same either way.

Rev it up with the gear change but keep your eye on the intake valve springs ( seat pressure). You could spray it with the JE piston as it's plenty thick for NOS. Better fuel ( octane) and reduced timing will be a must do. The performance gain will be huge like in the low 11's , high tens possibly.

What is a good ci to shoot for. Idealy. I wanted this motor to run low 11s or high 10s on motor .. was told by the builder. It should no problem .. with the old heads and cam. It went 11.75 on motor and 10.85 on a 200hp shot

Im in illinois so our racing season is basicly over so. I have all winter to tear it down and make it right

If it for drag racing primary usage, 100 more cubes (4.3 stroke), little bit more stall on convertor (but might work with the other changes), 4.3 or 4.56 gears for the weight of the car.

Boo boo

Boohoo ?

linearfab wrote:Boohoo ?

Double post......

Thats cool Dude . Im here looking for help . If u dont have anything Good to add why start trouble ?

linearfab wrote: Thats cool Dude .  Im here looking for help . If u dont have anything Good to add why start trouble ?  

I can add a lot of good to the this discussion and IMO already have, but if your too bull headed to listen what's the sense?

Im not too bull headed to listen . I simply stated im not goin to Switch the heads . Either way i spin it. Im spending money .. either spend money on iron heads and cam that will work with what i have that may. Not give me the room to grow. Or. Keep what i have and. Put more ci. In it .. u mentioned more cubic. Inch in ur first post. Which im agreeing with. I just dont agree with the heads and cam deal . Sure its an option. . Just not one i agree with. Sorry if that offended u