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Yeah. I used the flow numbers from the Shady Dell Speed Shop. Looks like it'll either be the XE274 or the 280H. I'll research a little more too. Moper, you brought something else up I had been debating myself...head selection. Would it be better to sell the 915 J heads and maybe get some...

I have been planning this build for a street 1971 Demon with a few passes down the 1/4 about once a month for fun. 360 + .030 stock crank and rods KB 107 pistons, zero deck 71 360 j heads 2.02 in 1.6 ex, gasket matched eddy air gap intake 750 DP 3.91 rear end question is this...

You also have other campanies that offer short blocks as well. I'm looking at this company right now to get a short block from for my Demon. http://www.bulletperformanceengines.com/EngineDetail.aspx?iid=60 Anyone have any experience with them. Their engines are available to order through...

Another possibility is using Magnum heads from a newer 5.9. Running a zero-deck with these heads, I understand, takes advantage of the heart shaped chamber for quench. You'd have to use different pushrods and a magnum intake(mopar makes sinagle and dual plane and edelbrock makes a air gap...

I believe that is about 10.6:1?

Hehe. Good enough for me. Future build is now set. Thanks a lot everyone for helping me out. I'm sure I'll have more questions once assemply and machining starts but for now, I gotta start researching where to buy things(and save a little more money).

Ah...makes sense. Still streetable?

At the moment I forgot how to calculate that. If I remember correctly, it's the difference from the center of the cam to the highest lift multiplied by the rocker ratio? I'll check my book tonight and re-calculate it.

Time to break it down: 360 block (zero decked, +.030) Stock Crank and rods KB107 +.030 Pistons XE274H-10 230/236 dur. .488/.491 lift w/ 1.6 roller rockers RPM heads RPM Air Gap intake 750cfm Holley Internally balanced Desktop Dyno puts this...

Out of curiosity....What's the difference in engine performance and reliability between hydraulic and mechanical flat tappet lifters? Any difference in pushrod length or rocker arm style?

That was the other thing I was wondering... What is the 360's block height? I've been trying to find it on the net but haven't had any luck. I think once I know that, I'll pretty much be set to make my choice on pistons. Getting close now...

Flat top design with valve reliefs or just flat top? With the Comp Cams XE274H-10 .488/.491, will they need valve reliefs? I'm researching all this stuff on the net so I'm learning, I'm learning. Thanks again. -Alex

Thanks for the info. I was looking at the KB741. I think they would have about 10.55:1 compression with the RPM 65cc chambers. What's the limit on compression for pump gas? Would you happen to know which kind of pistons would be good for my application for preferably not much more than $300...

Thanks so much for all your help. I'd like to break the 400hp range. And it will be a daily driver with track time about once a month. I just moved close to Baytown...the temptation is just too much. :-) The racing will be strictly for fun though. This is what I got so far... 360 .030...

A lot of great info and I thank you all for it. I may be leaning closer to the Edelbrock RPMs but not 100% yet. I guess the question I should ask is this: If I gave you $3000, how would YOU make a 450hp streetable 360 without stroking? Just keep in mind that I already have '71 360 heads...

As I said in my first post, this is a daily driver with 1/4 mile passes maybe once a month for fun. What would it take to get a 360 to about 400-450hp? I was thinking maybe around .500 lift...maybe the mopar .508/.508 cam. Or do I not need that much cam to get to my desired hp range...

Gonna be building a 450hp range 360 soon. I currently have '71 360 J Heads with the 1.8"/1.6" valves(rebuilt about a year ago) on my 318. What would be better to do? Buy some aftermarket heads like Edelbrock Performer RPM or Indy heads......or have these heads rebuilt for the larger...

Wasn't he asking about 360 heads? I'm lost.