The damage recently done

[Jeff Lee]

Originally Posted by SSDiv6

X2! The OEM's would consult with racers prior to submiting specs to NHRA.
Just like overlap on the Mopar Big Blocks; if I recall it was like 320 degrees in the spec sheet.

Pontiac started all of that. I'll bet engines ran real good with 320* of duration!

Originally Posted by Jeff Lee

Pontiac started all of that. I'll bet engines ran real good with 320* of duration!

To bad that's the way they came! Pontiac was one of the only manufacturers that put enough cam and valve spring in their performance engines. First computer designed cam to go in a production car, 1968 ram air 2 Firebird. That was the 041T cam used later in the Ram 4 cars.

[gmonde]

Originally Posted by Todd Hoven

To bad that's the way they came! Pontiac was one of the only manufacturers that put enough cam and valve spring in their performance engines. First computer designed cam to go in a production car, 1968 ram air 2 Firebird. That was the 041T cam used later in the Ram 4 cars.

this is funny because we stuck a factory ram air 4 cam in a 74 TA with 8:1 compression and we did get it to idle (it was a mess ) but this thing had a power band like a two stroke dirt bike ,,, and that was the hot ticket back in the day gmonde

[Jeff Lee]

Originally Posted by Todd Hoven

To bad that's the way they came! Pontiac was one of the only manufacturers that put enough cam and valve spring in their performance engines. First computer designed cam to go in a production car, 1968 ram air 2 Firebird. That was the 041T cam used later in the Ram 4 cars.

Pontiac had advertised durations that far exceeded the actual duration (which was no slouch for the day). And of course it matters where this figure was obtained from (.002, .005. etc)
Pontiac did this for class racing. If a cam had an actual 320* of duration, I'm not sure it would run!

I also had a real deal RAIV / 4-speed / 4.33 rear '69 GTO. Can't imagine what that must be like in a '69 Firebird!

[FINESPLINE]

Originally Posted by Jeff Lee

Pontiac had advertised durations that far exceeded the actual duration (which was no slouch for the day). And of course it matters where this figure was obtained from (.002, .005. etc)
Pontiac did this for class racing. If a cam had an actual 320* of duration, I'm not sure it would run!

I also had a real deal RAIV / 4-speed / 4.33 rear '69 GTO. Can't imagine what that must be like in a '69 Firebird!

Jeff, Bet you wish you had that Ram Air IV GTO now. Worth a lot of coins. Cars that we had and let go over the years ----Whew !

Jeff, for what it's worth. My Lemans that I raced for almost all my time in class racing started racing life as a bracket car. My first engine was a TRW piston, stock shortblock with d port 4 barrel heads and a Torker intake. The valvetrain consisted of a Crane Blurprint 041t cam and stock rockers.
The duration on that cam at .002 tappet lift was 308 in 320 exh. At .050 231 int 240 exh. 114 LC. That cam idled at 900 rpm with 14 inches of vacuum. I ran 12.18 109 in a 3700 pound car with 4.10 gears and 28 slicks.
That cam was right from Crane. The lobes were in the right place, and it had slow ramps. This is the way those cams were, like it or not.

Originally Posted by Jeff Lee

Pontiac had advertised durations that far exceeded the actual duration (which was no slouch for the day). And of course it matters where this figure was obtained from (.002, .005. etc)
Pontiac did this for class racing. If a cam had an actual 320* of duration, I'm not sure it would run!

I also had a real deal RAIV / 4-speed / 4.33 rear '69 GTO. Can't imagine what that must be like in a '69 Firebird!