[napster]

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

[napster]

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.

[napster]

Thought I would revisit this thread since I found out that there will not be a 427 stroker kit bringing the total CID to close to 440 cubes. The stroker kit is for a 461 that will mostly come in at close to 468 cubes. Opinions on the RA II heads I posted before and the roller cam version from Butler that I posted. Good, Decent or bad?

Thanks,
Jim

[PAUL K]

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!

[Tom Vaught]

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.

[PAUL K]

Originally Posted by Tom Vaught

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.

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.

[Tom Vaught]

Originally Posted by PAUL K

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.

[Brian Baker]

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

[Skip Fix]

Originally Posted by Brian Baker

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

Kind of what I was thinking.

[turbo69bird]

Originally Posted by Brian Baker

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

On my old 428 w 722s and a RAIV intake I ran 550 lift solid version of the RAIV cam and it ran consistent 12.00
Muncie m20 and a 4.10 gear w a 28 inch tall tire .

Launched it fairly high but didn’t shift it particularly high Ram good and lasted a long time. Was a good combo.

[grandam1979]

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

[DaleO]

Hi soupman. Would you mind sharing your cam's make and p/n?

[Steve C.]

The cam in post number 20 is a Butler custom grind:

https://butlerperformance.com/i-2503...tegory:1272239

The Comp XE lobes used are 3315 and 3316. However they were probably ordered with a "B" suffix code after the lobe number. When ordered with that code the .050 duration will remain the same but often the the advertised duration can be different, typically by 1 or maybe 2 degrees. Similar situation with the lift.


.

[Formulas]

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

[PAUL K]

Originally Posted by Formulas

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

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

[grandam1979]

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.

[napster]

Originally Posted by grandam1979

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.

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

[STEELCITYFIREBIRD]

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

[Cliff R]

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.......

[sberbs]

Originally Posted by Cliff R

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.......

So what was the custom grind stats?