New 347 Build... '75 Street Queen

[Mountain Ram]

73AZ-
I have been doing a little bit of research on Cams today- read thru the posts on here and Norcal as well as talked to Comp Cams (so far the only one to call me back).

Anyway- the cam you chose is not dramatically different from the one Comp recommended- XE266HR. Your cam has a little more lift on the intake side, but less duration as well. I really understood the 302 issue to be on the exhaust side and a cam should be slanted to more exhaust lift and duration. What are your thoughts on the difference of the XE266HR and yours?

Todd

 

[Amac70]

just listened to that cam in a 5.0 67 mustang. sounds bad ass. On the heads using that cam and gt 40 heads you will be sinking money into head upgrades that will not net you any performance just the ability to use that cam with those heads. Where as buying aftermarket aluminium heads are going to gain all around performance. Im running edelbrock performer heads and xe258hr cam in a 351w. Runs great night and day difference in power over the stock cam and heads. I believe Ilovemaui on this site is running the xe266 in his 408 stroker, might ask him how he likes its and what heads he's running. as for stripping out header bolts. Almost all new aluminum heads are helicoiled from factory, you should not be stripping out bolts.

 

[Mountain Ram]

Thanks for the input... I am pushing toward aftermarket heads... They are just so damned pricey!

I think I just listened to the same stang you did if it was a YouTube video...

Todd

 

[Hozr]

This is the cam I'm running. Hydraulic flat tappet

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=791&sb=2

The P heads produce the most torque for a stock head. I had them lying around. I ran trick flows on my cobra for the weight savings. Not an issue on the bronco.

 

[73azbronco]

The cam I speced which is like the 266, is made specifically for a stroker, with a manual and with a carburetor, with 4.1 gears and 33 tires, change any of those and the cam needs to change.

Still unknown on true potential of this cam until it runs in a truck, I'll be back with Dino info.

 

[Jeff10]

Hey,

Subscribed... in hopes of learning more about the 347 stroker in our '70.

Jeff

 

[Mountain Ram]

Hey,

Subscribed... in hopes of learning more about the 347 stroker in our '70.

Jeff

Jeff,
Do you currently have a 347 stroker in your '70 or are you putting one in? If you already have one- it would be good if you could post your specs if you know them.

Todd

 

[Mountain Ram]

Strongly considering the XE266HR (35-514-8) from Comp Cams... anyone have any horror stories with this cam before I drop the coin??

Todd

 

[bigcountry]

i am building a 347 with trick flow 170 heads and around 10:1 compression. I called cam motions in LA (the cajun state, not California) last week to get a custom grind and this is what he recommended.

216 and 220 @ .50
.528 and .512 lift
110 lobe seperation
106 centerline

He said it had 2 degrees advanced built in. Cost is $349.

Very nice folks and easy to talk too.

 

[Mountain Ram]

So many 347s... So different in the details!! I wonder if you could really tell the difference in the seat of the pants... When it's all done, we should throw a thread together with everyone's specs.

With TF heads... Don't you have to run special pistons with the valve reliefs in different locations than most other heads?

FYI Specs on the 35-514-8 XE266HR Comp Cams

216 and 224 @ .050"
.544 & .555 lift
112 lobe separation
108 centerline
1600-5600rpm

One thing I noticed is that most other cams I have seen here have more intake lift, but the Comp cam has more exhaust. Everything I have read about Ford heads (
stock and aftermarket) said the exhaust is the choke point... If that is true, why would you run more intake lift?

 

[73azbronco]

Can't generalize that Ford intakes are weak when pretty much everyone will be using aftermarket intake and heads on a 347. If you will be using stock gt40, then yes, you would be accurate.

 

[Mountain Ram]

Can't generalize that Ford intakes are weak when pretty much everyone will be using aftermarket intake and heads on a 347. If you will be using stock gt40, then yes, you would be accurate.

Likely a product of reading way to much and trying to mash all the data in my head... Aftermarket heads are way better than the GT40s... I have read though that due to the geometry of the SBF, flow limitations in most SBF heads are driven by the exhaust side... Which drives the dual pattern cams. But to your point- every head would be different...

Moving on!

 

[73azbronco]

Yep, took me a few years to figure it out and I still dropped dime and had a company design mine, of course it's untested other than test stand, but, I'm hoping the guy who does this year over year can do a better job than me guessing.

 

[01Dudley]

You guys are doing some series homework here and I love the fact that you are sticking to your guns and building a 347! How could so many NMCA, Outlaw racers, and Fast Ford guys be wrong? The 347 is a beast and yes the head / cam combo is the key to the whole puzzle. I have friends that have had great luck w/the Edelbrocks, but the GT40P is a great bang for the buck. The "P" head has tons of potential to make some real power.

Good luck w/it and I keep following this great build!

 

[Mountain Ram]

Ordered the XE266HR cam- for better or worse... I also ordered matched valve springs.

I received the ARP main studs last night, and I am waiting on lifters and double roller timing set as well.

Todd

 

[Hozr]

Good call Todd, you won't be disappointed.

 

[Thunder26]

If your PTV clearance allows it advancing that cam 4 degrees would definitely give you some torque and bring your power band to 1000-5000 most likely.

 

[Mountain Ram]

If your PTV clearance allows it advancing that cam 4 degrees would definitely give you some torque and bring your power band to 1000-5000 most likely.

I will have to look at it... The lift is pretty big with a longer duration. Looking at aftermarket heads, the 2.02 intake valves would add to that problem. Thanks for the input.

Todd

 

[Mountain Ram]

While I am waiting for the cam to get here, I decided that the winch and bumper needed to come off to gain access to the from of the engine bay. Forgot how heavy that winch was...

With 37" tires and 7"+ lift, the engine hoist looks like I can get the motor out without pulling the front tires off... I guess we will see...

Crappy cell phone pics attached

 

[airbur]

Remove the tires.....put axle on small jack stands or blocks. That lift won't be able to get it high enough as is.

Also remove the hood.