dennis r

iTrader: (1)

Rick I'm Running A 598 With Dart Alm. 320 Ported By Jim V. A Dart Intake Bigs Performance 1050 Holly Comp Solid Cam 264/[email protected] 714 Lift I Made 800 At 6000 Rpm

rv

Seems like alot of you guys are running big cams. How low do they idle? What happens when you drop it in gear?

What do you think a cam with 244/256 @50 and 0.632" lift on 114 will do/make in this engine?

Rick

PatriYacht

Several people are advising big heads and big cams. In your first post you stated your goals of 750 hp at @ 5500. With 598's it's not hard to make 750. 355cc heads and long duration cams will push the power peak too high up in rpms. Look at building an engine like gg10's with a smaller cam. Several of us are using AFR315's and 335's on 540's with cams around 236/240 duration .630 lift making around 700hp. Using those same components will make more hp on a 598 just because of the larger cubes.

PatriYacht

That cam is good in a Gm iron headed large cube engine. The long exhaust duration helps out the poor exhaust port. If you are going to use a modern cyl head, a cam with a smaller split between intake duration and exhaust will make more hp.

jdnca1

You can get them to idle ~900 and they drop to 650 in gear. No big deal if your carb is tuned. We run those Crane 651 cams in 502 blower motors and power peaks at ~6100. I agree with Patri, there are better cams to run with good heads...I would go with 6-8 split on 114 or even 115 if you want bette idle...If you're going to spend the $$ why stop at 750hp...another 75-100hp is easy on essentially the same componets. For reference, I ran a 272/278 @.050 on 114 and 280/288 on 115 in 632" tunnel ram motor. power peak was 6100 and 6600 respectively. The second cam was a little ridiculous and very hard on parts. Keep net lift around .700" and with "soft lobes" with a solid roller and you will get good life out of the valvetrain. I have no idea's with Hydralic roller since I never ran in that motor. Wette Vettes ~262/270 on 114 would be a better choice based on your desired rpm..but it keeps pulling past 6000.

rv

Thanks for the replies. Sounds like the cam isn't the best out there considering the heads are Dart Pro1 and the exhaust is EMI elbow top.

Rick

Back4More

Rick, Just for reference, I have HR 248/258*@.05--608/617" on 114 in the 557's with 350 heads and 5psi of boost....850HP@5600rpm

StraightJacket

R. V. I'm on the south side and have a set of N/A 540's that make 730 hp. with unported darts. P.m. me and we can talk. If you have seen or been on any CPC run you'll know our boat.

Spirit38

Straight Jacket,
Rebuilding my 558's email your engine specs, cam, head flow, etc.
Thanks