[61-63]

With valve springs and valve lengths that will handle the added lift of course.

[JSchmitz]

Of course. I had one with Crower SS roller rockers. Loved it. What are you wanting to know exactly?

[61-63]

I'm building an engine and had a lunati cam for it but the heads I had made up ended up having springs/valves installed that are a tad too short for the cam so I need another cam, so I'm thinking I may get Butler's hydraulic roller ram air iv but with a 110 lobe separation. My heads have 1.65 rockers roller rockers in them. Tom S. suggested I get the old faithful cam and I would like that option but it turns out it too would give me just a tad more lift than I would be comfortable with, so I am looking at the ra iv. What cubic inches, compression ration ratio, and rear end did you have and how did you like it? I will have a 421 with 9.5cr and a 3.42 rear end. Not a race car a '63 Cat sd tribute car.

[track73]

I am really satisfied with the cam and 1.65 rockers, but I also have Rhodes lifters and a .030 455. I think your combination would benefit from the Rhodes lifters.

[JSchmitz]

I had a flat tappet Melling RAIV grind. It was 455, 9.25cr, very lightly ported D-port, 3.23 cogs, 64 GTO, 400 turbo with 13" Continental, etc. Ran low 12's on 9" slicks at close to 3800# with driver.

[John Milner]

I run a TC02 hydraulic flat tappet cam made by Isky (236/244@.050) with stock ram air iv length valves and stock ram air iv 1.65 rockers in my 428. I believe the lift is about .561/.567 with the 1.65 rockers. My compression is 10:1 and I run a 4 speed and currently have 3:23 gears. I think it would like 3:55-3:90 gears better but does fine with the 3:23's. I like this particular setup. It idles with a loap and pulls to 5,500 very nicely. It has plenty of low end torque and is a handful when you put your foot in it. I've never measured my vacuum at idle but it has plenty to run the power brakes. I would imagine that the ram air iv cam would run very similar to this one.

[JSchmitz]

The RAIV cam combo has been documented to death. Do a search. You can read until you're sick. lol

[Singleton]

Here’s the Butler “041” roller cam. Different specs than the factory 041 RA4.
It’s just a marketing name.

[steve25]

How about someone answer the guys question before giving him different Cam recommendations!

To run over .500” lift safely without cutting the spring seats on what I am assuming are iron D port heads you will need valves in the 5.210” lenght range.

You will now of course need longer push rods.

You will also then need springs with a installed height in the 1.800” range.

[Singleton]

Originally Posted by steve25

How about someone answer the guys question before giving him different Cam recommendations!

Literally no one here has given a different cam recommendation....
I posted the specs of the roller cam that the OP is wanting to use, so that people aren't confusing it with the flat tappet 041 that we all know.

notice that the butler cam has .507/.541 lift with 1.5 rockers. That would be .557/.595 with 1.65's

[61-63]

Fellas the valves and springs are already in the heads and the heads are done. Jim Robertson did the 127 heads a couple of years ago and put 914 springs in them and valves that will accommodate that Butler roller ra iv cam with 1.65 rockers on top of it, but not the lunati roller cam I already had. I've been fiddling with this car since '07 and have all the stuff to make it look like a real '63 Catalina 421 Super Duty. The block is at the machine shop and I'm about to take the rotating stuff there to be balanced and need to decide on the new cam and am thinking I want to use the Butler roller ra iv with a 110 lobe separation to get a little more rumble, hence my question.

[Tom Vaught]

I installed two RA-IV cams in the two RA-IV engines I repaired and posted about in a different thread.
Both were 1969 engines with the 1.65 rockers stock and the 1.8?? tall "Factory Springs" for the application.

Tom V.

[61-63]

I failed to thank everyone for the responses so thanks, very much appreciated.

[ta man]

Originally Posted by steve25

How about someone answer the guys question before giving him different Cam recommendations!

To run over .500” lift safely without cutting the spring seats on what I am assuming are iron D port heads you will need valves in the 5.210” lenght range.

You will now of course need longer push rods.

You will also then need springs with a installed height in the 1.800” range.

At stock installed height the go to spring that I have used is a Crower 68404.

[67Fbird]

Originally Posted by steve25

How about someone answer the guys question before giving him different Cam recommendations!

To run over .500” lift safely without cutting the spring seats on what I am assuming are iron D port heads you will need valves in the 5.210” lenght range.

You will now of course need longer push rods.

You will also then need springs with a installed height in the 1.800” range.

yes yes and yes was my exact set up on my 400.....now discovered on my current build 455 the #62 heads were VERY VIRGIN as i have the 5.2 tall valves and old crane keepers show my install is 1.780....a little short for my old springs so am adding in +.050 keepers to get me in the HFT rate of 120 x 300 lbs.

Also NOTE: if you are running iron heads you MAY need ot clearance the push rod holes depending on WHICH 1.65 rockers, WHICH lifters you are running.

[Singleton]

Originally Posted by 61-63

Fellas the valves and springs are already in the heads and the heads are done. Jim Robertson did the 127 heads a couple of years ago and put 914 springs in them and valves that will accommodate that Butler roller ra iv cam with 1.65 rockers on top of it, but not the lunati roller cam I already had.

So basically you’re wanting feedback from those that have used this Butler, (Comp), roller cam as far as performance? It’s fairly new, so probably not many have used it yet. I’m interested in real world results as well.

[tom s]

Guys,the heads were designed for 1.65 rockers and were never avil with 1.50s.Not sure if 65-66 1.50 rockers will even work properly on the heads.Tom

[61-63]

Originally Posted by Singleton

So basically you’re wanting feedback from those that have used this Butler, (Comp), roller cam as far as performance? It’s fairly new, so probably not many have used it yet. I’m interested in real world results as well.

No I just wanted to know if people had used the original ra iv cam with 1.65 rockers. I should have clicked around instead of asking probably and have probably read about it on here twenty times having been on here twenty years now. I'm glad I asked though there are some good answers above. I think I'm going to get Butler's roller version and will come back when I get this engine together later next year and say what I think about it and post some pictures too.

[Tom Vaught]

Originally Posted by tom s

Guys,the heads were designed for 1.65 rockers and were never avil with 1.50s.Not sure if 65-66 1.50 rockers will even work properly on the heads.Tom

I WILL TELL YOU FOR SURE THAT A 389 1965-1966 ROCKER ARM WILL NOT WORK ON A 400 CYLINDER HEAD OR VICE VERSA.

I made that mistake ONCE in 1971.

Tom V.

[tom s]

TOM!Its a 62 421 SD 127 head!Tom