Quote 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.