Thread: Larger engine tames a cam???

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That sounds like a very healthy combination to me, and a really good engine for street performance. Are you going to have it run on the dyno before you put it in the car? I have a similar combination in my '32 and I am very happy with it.

Originally Posted by rumrumm

That sounds like a very healthy combination to me, and a really good engine for street performance. Are you going to have it run on the dyno before you put it in the car? I have a similar combination in my '32 and I am very happy with it.

.....Yes it's going to be Dyno'ed. I feel more confortable having it all broken in and Dyno'ed before being shipped back to Kansas. Plus if something is wrong with the re build it'll probably let go on the dyno, sort of 'rebuild insurance' if you will...... Plus the last time this motor was built it put out 40 more HP from the first to last Dyno run..... Oh Rumrumm what stall do you have in your '32??? Thanks ;0 Bill

Originally Posted by billlsbird

.....Yes it's going to be Dyno'ed. I feel more confortable having it all broken in and Dyno'ed before being shipped back to Kansas. Plus if something is wrong with the re build it'll probably let go on the dyno, sort of 'rebuild insurance' if you will...... Plus the last time this motor was built it put out 40 more HP from the first to last Dyno run..... Oh Rumrumm what stall do you have in your '32??? Thanks ;0 Bill

I am running a B&M Holeshot 2400 stall in a 700 R4. My 383 has a CompCams Magnum 280 hydraulic (.480/230 @ .050). I wanted to run the XE-274 but it made my DCR too high for pump gas. With AFR 190 heads it dynoed at 450 hp and 468 ft. lbs. of torque. I am very happy with the combination.

.... Rumrumm, Ut oh, an I in trouble??? Quote; " I wanted to run the XE-274 but it made my DCR to high.". Can a small cam change like that change your compression ratio THAT much??? Or is the XE-274 NOT that small of a cam??? But wait, isn't the XE-274 a bigger cam & doesn't a bigger cam lower your compression ratio??? I have the AFR 74 cc heads, what CC are your heads??? Please tell me they are the 68 CC heads!!!
Well you've also got a TQ monster in your '32! In fact, I think I saw pretty much that same combo on the AFR dyno page of their web site? I was going to run the 280 Mag. & then I changed my mind. Everyone except my engine builder recommened a split duration cam. He said that AFR heads flowed so good on the exhaust side that I'd lose TQ with a split duration cam but even AFR disagreed with him. So this REALLY confussed me also....
It looks like are TQ converters are close in stall so I should be good on that one at least..... Thanks for all your help.... Bill

Originally Posted by billlsbird

.... Rumrumm, Ut oh, an I in trouble??? Quote; " I wanted to run the XE-274 but it made my DCR to high.". Can a small cam change like that change your compression ratio THAT much??? Or is the XE-274 NOT that small of a cam??? But wait, isn't the XE-274 a bigger cam & doesn't a bigger cam lower your compression ratio??? I have the AFR 74 cc heads, what CC are your heads??? Please tell me they are the 68 CC heads!!!
Well you've also got a TQ monster in your '32! In fact, I think I saw pretty much that same combo on the AFR dyno page of their web site? I was going to run the 280 Mag. & then I changed my mind. Everyone except my engine builder recommened a split duration cam. He said that AFR heads flowed so good on the exhaust side that I'd lose TQ with a split duration cam but even AFR disagreed with him. So this REALLY confussed me also....
It looks like are TQ converters are close in stall so I should be good on that one at least..... Thanks for all your help.... Bill

Yes, my heads are 68cc heads and I run a static compression of 10.6:1. The Magnum 280 gives me a DCR of 8.46 which is okay with 92 octane, but the XE-274 would have put me at 8.67. Interestingly enough, on the DD Dyno program I was using to choose cams, the XE-274 made a few more hp from 3000-5000 rpm but at 5000 rpm the Magnum 280 caught and surpassed it by 2 hp by 5800 rpm.