OK, this is slightly off-topic, this is for my '76 Suburban, but I have been told this is the best forum for Big Block Chevy tech from my Chevelle (and Corvette) buddies.

I am building a new 454 for my suburban. I was planning to go roller cam, but started running cams through Desktop Dyno and there are some flat tappet hydraulic cams that look really good, especially considering the price. This will be a daily driver, 454, 1800ish stall TH400, headers, RPM intake, MSD, Speed Demon carb. Currently running XE256 cam, which runs out of breath around 4500 RPM, but not too bad.

I have a Comp Magnum 280 (230/230 adv, .520/.520 lift) available at no cost. This makes more peak torque and HP than the 256 and some of the roller cams I looked at, and has low enough peaks that I think this would work well with the heavy Suburban.

Can any of you comment on this cam in a 454 on the street? Idle, off idle manners, etc?
Thanks,
Jeff

Check out the XE 4x4 grinds. They are pretty good in heavy trucks. Go easy on the cam, use your Desk Top Dyno to build the most torque under 3500 RPM as possible.

How about the X4262? 218/226, .505/515

:D

If you have a stock motor, you are only like at 8 or so to 1 CR. That last cam sounds like a dandy as well as CC's good old 260HE.

I will say that I have ridden in a h-d 3/4 4x4 with big tires and headers and I figure 3.73's that had a 280 Magnum in a stock 454 motor. (In fact, I think I ended up with it as the core motor for my 496??)...

Nice idle and even tho the 280 was waay too big imho, it ran fine b/c a 454 is a big motor and makes alotta power regardless.

Whatever you do, install better valve springs!!!

pdq67

Let me clarify...this is a total rebuild so compression will be determined based on cylinder head and cam selection, probably around 10:1. Right now I am thinking of using the Trick Flow Oval Aluminum heads. Their flow numbers are pretty impressive for a relatively small intake volume, and they come with springs for either flat tappet or hydraulic roller applications, buyer's choice.

Then stick an XE274 in there. A GREAT cam in a 454 that pulls hard from idle to 5800 RPM. 230/236 .552/.555 :D

Then stick an XE274 in there. A GREAT cam in a 454 that pulls hard from idle to 5800 RPM. 230/236 .552/.555 :D


I second that or possibly the 4x4 extreme equvilant