Quote:
Originally Posted by enkeivette
Is this 7k 400 in your Vette? It's not the one with balance issues is it? Cuz I really want to feel what a 7K rpm SBC is all about. Mine has some expensive parts and even it chokes out at 6K.
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Your engine shouldn't choke at 6000. I run the 454 in the Chevelle to 6500 and I have about the same size cam as you do 246 @.050 with a .623 lift with a longer stroke. You may not have enough valve spring pressure if it's choking at 6000. That's what happened to me with the old valve springs on the 454. They were the stock Edelbrock ones that are for a flat tappet cam and I'm running a solid roller. Since I only run it to 6500 they had enough pressure for a couple years but then the car started to choke past 6000. I haven't run it down the track yet to see how it pulls but I jumped on it in second gear with the new springs and with the tires blazin I quickly shifted it to third when the tack hit 6800.