[Vettezuki]

Originally Posted by Leedom

Would I be safe in calling the 429 option a "fairly" tame street motor?

I am assuming that this motor would be over 450HP and about 500 ft/lb?

That's going to depend on how you finish it off with intake, and headers, etc. But I rather doubt anything near that power and torque level. Especially if compression is down that low and those are stock unported heads. Think more like 350/400 (at the crank . . . maybe). I've seen this happen in person at dynos. Guys with good ole big blocks in street cars (not like Ron's Chevelle), finished off rather nicely, get a little disheartened when they discover their power to the wheels is in the low 300s at best.

Now let's see what the guys who know what they're talking about say.

[94cobra69ss396]

Originally Posted by Leedom

Would I be safe in calling the 429 option a "fairly" tame street motor?

I am assuming that this motor would be over 450HP and about 500 ft/lb?

Depending on the heads and compression I would would guess around 350-400hp and 500-530tq.

[94cobra69ss396]

Originally Posted by Vettezuki

That's going to depend on how you finish it off with intake, and headers, etc. But I rather doubt anything near that power and torque level. Especially if compression is down that low and those are stock unported heads. Think more like 350/400 (at the crank . . . maybe). I've seen this happen in person at dynos. Guys with good ole big blocks in street cars (not like Ron's Chevelle), finished off rather nicely, get a little disheartened when they discover their power to the wheels is in the low 300s at best.

Now let's see what the guys who know what they're talking about say.

I'm thinking around the same as you except I think it will have 500tq. By the way your right about the Chevelle. When I took it to have it dyno'd to check the AFR Steve told me that he thought it would put down around 350rwhp. He was really surprised when it put down 460rwhp.

[Vettezuki]

Originally Posted by 94cobra69ss396

Depending on the heads and compression I would would guess around 350-400hp and 500-530tq.

Do you mean at the flywheel or to the wheels?

I forget BB torque is so stout.

[94cobra69ss396]

Originally Posted by Vettezuki

Do you mean at the flywheel or to the wheels?

I forget BB torque is so stout.

At the flywheel.

[joedls]

Originally Posted by Vettezuki

This seems to be the cam in question.

Can we call it on the mild side of larger, or bigger side of mild? It's certainly bigger than any OEM cam I can think of. An interesting question might be, what was the size(s) of the original Mach1 cam?

You're right though it's not a screamer, but 112 LSA is going to lope a bit. Whether that's ok for regular street driving is a matter of personal taste.

I've had several SBFs with 112 LSA and they really had very little lope, if any. The 429 is going to smooth out that idle much more than the SBFs I've had. You really won't get any lope, IMHO.

Edit: I see this has already been covered. Just disregard what I said.

[BRUTAL64]

Originally Posted by Leedom

Yes Glenn you suggested it too. We had been talking about it and I think the conversation with you kind of pushed him over the edge and is not seriously looking into it.

"you kind of pushed him over the edge and is not seriously looking into it"

So now it's my fault?????

[joedls]

Originally Posted by 94cobra69ss396

I'm thinking around the same as you except I think it will have 500tq. By the way your right about the Chevelle. When I took it to have it dyno'd to check the AFR Steve told me that he thought it would put down around 350rwhp. He was really surprised when it put down 460rwhp.

A stock 429 in a 1970 Mach 1 made 370 bhp and 450 lbs-ft of torque. They were 11.3:1 compression.

[BRUTAL64]

Originally Posted by 94cobra69ss396

No need for anything more than that. I'm not sure what the compression was on the original engine but my guess would be somewhere around 9:1. Glenn probably would have an idea.

1970 had 11 to 1 compression. Same as my 70 T-bird. Stock HP is 360 with 485 ft lbs of torque.

My 429 runs great on 91 octane. The bigger the cam the better the 11.1 works.


A cam with .050 duration of about 235 degrees is a good start for the 429. Try to keep the lift down for a street engine. Guide wear is bad with a very high lift cam.

[Vettezuki]

Originally Posted by BRUTAL64

1970 had 11 to 1 compression. Same as my 70 T-bird. Stock HP is 360 with 485 ft lbs of torque.

My 429 runs great on 91 octane. The bigger the cam the better the 11.1 works.


A cam with .050 duration of about 235 degrees is a good start for the 429. Try to keep the lift down for a street engine. Guide wear is bad with a very high lift cam.

Were those stock heads worth a poop?