Guest bigjim240z Posted January 21, 2003 Share Posted January 21, 2003 ok..i got these numbers from edelbrock so if they sound right i think this is the engine i will build...350 block with hyper flattop pistons, edelbrock rpm cam kit, rpm intake, rpm aluminum heads, and a 750 cfm carb...along with a set of headers theey claim about 420-430 hp...does this sound right..if so ill start ordering up the parts..thanks jim Quote Link to comment Share on other sites More sharing options...
jt1 Posted January 21, 2003 Share Posted January 21, 2003 Sounds about right to me, I'd spend a few extra bucks and go with some good forged flat tops instead of the hypers, and shoot for 10.5:1 compression. You'll need that much to make those numbers IMO. John Quote Link to comment Share on other sites More sharing options...
Guest bigjim240z Posted January 21, 2003 Share Posted January 21, 2003 well according to edelbrock they had 9.5:1 compression 350 chevy...so i hope they are right..lol..thanks for the info. Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted January 21, 2003 Share Posted January 21, 2003 I built that exact combo a few years back. Do a search! I was dissapointed to say the least. In my Z it ran high 13's to low 14's. I was not the only one I do not remember who it was but he had the same problem as me. Look at the cam..It's big! With 9 to 9.5 to 1 that set up will really struggle. I stayed with the heads and intake but went roller cam with 230 duration and 10.3 to 1 compression and now turn 12's. If you run that set up run 10.5 to 11.0 to 1 compression and then you will be one happy customer. That cam they sell is a 236/244 or something like that. I just gave mine to my friend. He is using it on a 11 to 1, 383 sbc. Mike Quote Link to comment Share on other sites More sharing options...
Heavy Z Posted January 21, 2003 Share Posted January 21, 2003 I agree with ZFAN, I've got the rpm intake and heads but edelbrock can keep their cam. With your setup I'd recommend the comp cams XE274H - 230/236, 110 LS, great cam and way more streetable. This cam will pull hard to 6,000rpm and is well suited to what you've got. I've seen many of these run well over 400 hp in a 350. My 327 has the comp cams XE268H (which in a 327 acts similar to a 274 in driveability) and I am nothing but happy with the instant-power this cam provides. Just my opinion, good luck! Here's some comp cam dyno sheets: Cam Options Brett Quote Link to comment Share on other sites More sharing options...
Guest bigjim240z Posted January 21, 2003 Share Posted January 21, 2003 sounds good heavy...i think ill try the comp cam you recommended...looks like a great performer...what do you guys think about the intake and carb?..i was going to use the 750 edelbrock ...should it?..or should i get a holley 750 double pumper?..what about the rpm intake?..should i use somthing else?..thanks for all the help..ive built a bunch of 350's but never one that i want to extract as much hp as possible out of..just a bunch of more or less stock engines..lol..thanks Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted January 22, 2003 Share Posted January 22, 2003 I like the RPM intake but due to clearance issues I went with the Weiand Stealth dual plain intake. Do not get me wrong as I used the rpm air-gap intake as well and LOVED it. I have used the Edelbrock 600 and 750 as well as the Holley 750 double pumper. If pure raw power is what your after then run the rpm intake and Holley 750 double pumper. By the way that cam 230/236 sounds sweet. I wouldn't go any higher for duration. My Comp cams xr276hr-10 is the bomb. 224/230-502/510 with 110 lobe seperation. It pulls hard from 2000 to 6300 rpm's. Mike Quote Link to comment Share on other sites More sharing options...
Heavy Z Posted January 22, 2003 Share Posted January 22, 2003 Once again ZFAN is right - do a search and you'll find out why a double pumper seems to get more nods, as vacuum secondaries were made to function in a car 1,000 lbs heavier they lead to their own drawbacks. Another way around the vacuum secondaries is buying a used carter competition series - identical to the edelbrock but can be had with manual secondaries(and a cheap price on ebay). With the rpm intake and 650 double pumper I can use either the triangular foam air cleaner or a 14" x 3" with drop-down neck. If you need more room go with a stealth ram. Good luck! Brett Quote Link to comment Share on other sites More sharing options...
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