[BRUTAL64]

Originally Posted by 94cobra69ss396

Elaborate.

Ron, you guys are doing great!

Just the cam...I have issue with..but it is already in and will be great for the 429. But cam choose is subjective...I would have used another cam for 429...I have been away so my input is worthless.

You guys are doing a great job on the build.

I jsut put an edelbrock 750 performer carb on my 429 and it works great

[94cobra69ss396]

What cam do you like for this 429?

[BRUTAL64]

Originally Posted by 94cobra69ss396

What cam do you like for this 429?

The cam you guys picked is good with 9.5 and lower compression.
The higher compression should use a little bigger cam....easier to keep ping at bay.


I would look for something in the 230 effective intake duration and 10 degrees more on the exhaust duration because of the poor exhaust port.

Lobe seperation around 108 for the lope he wanted.

You can use BBchevy roller rockers if the heads use adjustable studs.

Just my 2.5 cents...means little at this point

The cam u picked is going to work good though...he will be very happy with it.

Almost forgot I do NOT use Comp Cams......don't like them...other people swear by them ...I jsut know a different history of problems that most people aren't aware of.

[Vettezuki]

Originally Posted by BRUTAL64

The cam you guys picked is good with 9.5 and lower compression.
The higher compression should use a little bigger cam....easier keep ping at bay.

Is this just because as the valves are open longer the peak cylinder pressure and therefore combustion temps are lower?

[BRUTAL64]

Originally Posted by Vettezuki

Is this just because as the valves are open longer the peak cylinder pressure and therefore combustion temps are lower?

More to do with cylinder pressure than temps.....though high pressures can cause higher temps. But we are are talking higher than 11:1.

At lower engine speeds the valves will be open a little longer and therefore bleed a little pressure....but at higher rpm longer open valves mean more air/fuel for engine.

[94cobra69ss396]

I don't think it will run all that bad with the smaller cam and we should be able to keep it from detonating by pulling a couple degrees of timing. Speaking of timing do you know how much total advance these D0VE heads like? I've heard around 34 total and figured we would start at 32 and see how much 91 would allow us to go without pinging.

[BRUTAL64]

Originally Posted by 94cobra69ss396

I don't think it will run all that bad with the smaller cam and we should be able to keep it from detonating by pulling a couple degrees of timing. Speaking of timing do you know how much total advance these D0VE heads like? I've heard around 34 total and figured we would start at 32 and see how much 91 would allow us to go without pinging.

If he has the closed chamber heads...you can go 36 degrees at about 2700 rpm. Some have gone as high as 38 but 36 is good......if it pings...well you know what to do...

Closed chamber head 71 and older

The open chamber you can not do shit with...they ping no matter what you do...no quench area on head.

[94cobra69ss396]

I think Andy said they were 70. I don't know what the open chamber looks like versus the closed chamber but since they only had 71cc (IIRC, I think that's what we cc'd them at) combustion chambers I assume they are closed chambers.

[BRUTAL64]

Originally Posted by 94cobra69ss396

I think Andy said they were 70. I don't know what the open chamber looks like versus the closed chamber but since they only had 71cc (IIRC, I think that's what we cc'd them at) combustion chambers I assume they are closed chambers.

Yes, they are closed chamber...same as on my T-bird....these heads are so good I've had a spare set for 30 years.

[Leedom]

Good luck with the car today Ron and dad. I wish I could be there to help but as we know I got a little one to watch over. I hope you guys finish today! I can not wait to hear that monster and get some time behind the wheel myself.