Ram Air Series Cam from Butler
 

I'm having an engine built for my 1969 GTO. Decided to make it a ram air car.

I looked for some 722 heads to no avail and stumbled on to the RAII heads Pictured

While I was at it I came across the following new cam from Butler. Thought I would give a try.

Engine will be .60 over and with a 427 stroker kit will equal either 440 or just shy of 440 CID. Compression will be 9.9 and using RA IV exhaust manifolds.

Should be an interesting build.

The intake/exhaust lift is opposite of what a RA II head generally likes. It will probably run better with a 1.65 rocker on the intake and a 1.5 on the exhaust... Seems like a cool build!

This is a flat tappet Hydraulic Camshaft? Like Factory?

Do not understand the HR at the end of the part number. (HR typically means Hydraulic Roller).

Tom V.

I was assuming it’s a hydraulic roller from the card?

Would the extra exhaust lift come in handy with iron exhaust manifolds

Are the heads dated D228? If so production heads are a little more desirable than service heads. Looking at the picture both will be D228.

Probably not for a street type application. Eventually if the engine is spun high enough the added lift will help.

Took a look at their new cam offerings. Indeed a Hydro Roller. RA seems only a name!

https://butlerperformance.com/c-1234...by-butler.html

Hi Tom, yes that is a hydraulic roller cam. Butler offers a "Ram Air" series of HR cams now.... As you know the Butlers are great with marketing. :)

Agree, David Butler has made good use of that Business Degree (over the years that he has run Butler Performance).

Tom V.

Hydraulic roller version of the venerable 041 grind will run well with those heads and around 440 cubes.

I end up building quite a few carburetors for engines done there or from folks who have bought parts there.

For quite a few years they pushed a LOT of XE cams and most of their custom stuff was ground on 110LSA's for quite a few years. The XE268, XE274 and XR 276 HR were high on the list.

It's probably been 3 or 4 years now if not longer, but after a phone conversation with them about an engine they were dyno tuning I sent them the cam card comparison below.


Things have changed quite a bit since then, if anyone is paying attention.......

Kind of what I was thinking.

These are early heads without the 96 above the center ports. The 96 was added later to aid the assembly line workers. The first service replacement heads were dates in January, 1969.

Look at post #25 by The Boss in the link for the dates of production for the RA II heads.

http://forums.maxperformanceinc.com/...04#post5256604

So what was the custom grind stats?

Here are both cams.

Smaller 276 roller on 110 LSA
Intake
3314
276 @ .006
224 @ .050
145 @ .200
.335

Exhaust
3315
282 @ .006
230 @ .050
151 @ .200
.340

----------------
OF roller on 114 LSA

Intake
3122
290 @ .006
236 @ .050
160 @ .200
.3800

Exhaust
3120
304 @ .006
244 @ .050
161 @ .200
.3830


I don't see LSA... just a chit ton of AREA difference - same as the engine.

https://i.imgur.com/doNShMM.png

Here is another 455 dyno with 250 CFM d-ports (I think they did more than 70 pulls) using the smaller roller - https://www.hotrod.com/articles/hppp...e-stuska-dyno/

Another member Tom S used the smaller cam on a stock iron dport 455, made 432 HP.

They added the 96 the next day D238

With the round port exhausts and the smaller D port sized intakes I'd flow the heads before I bought a cam. Betting a single pattern or a "reverse" split like my RAIV heads liked.

Skip,

I was thinking of the attached cam before I saw the RA series cam. The attached cam is being used in my 1970 T/A. It has 614 heads and is a 433 CID engine. It runs very well.