r8ceredy

A question for the collective experience of RJ. I am working on a 582 Dart low deck BBC. (4.600boreX4.375stroke) I am building this for pump gas, 10.5:1 compression and wondering what size heads to run on it. I am looking at a set of aluminum Dart Pro 1 and they are offered in 325cc,345cc and 355cc for the same $$$. I thought the 325cc might not flow enough for the cubic inches, even though they would probably be the most responsive on the velocity theory. I will run a Comp Cam solid roller 256-263* @ .050 duration, .660 lift camshaft(3500-7500). The car weighs roughly 3300# and I have a 4.56 gear, th400 w/3500 stall, and Hoosier Quick time pro 11.0" tires. The car is 90% street, seeing occasional 1/4 fun. Big post here, but want your opinion on intake runner size. Thanks

lmchevy

If you are going to use an as cast head then go with the pro1 345.The 355 darts you mentioned is cnc ported and is about $1000 more than the as cast head.

superstreeter

what are you running for dynamic compression, with say a 118 cc head?

cboggs

That combo will want the largest of the heads you posted, . . .

The Dart Pro 1 355 is a fully CnC ported head and sells for $3600 complete.
The pro 1 345 is the as cast head, sells for around $2600 a set complete.

I have an Edelbrock Victor head that we designed and CnC in-house
I'll sell you complete for $3300, flows 450cfm, ..

Curtis

r8ceredy

Static compression with the 118 is 10.5:1 for pump gas use. I don't intend on nitrous, but the sickness might take over if the car don't run a good number :twisted: :twisted: :twisted:

r8ceredy

What kind of throttle response & street manners will a big intake runner have? As much as I want to have quick times at the track I do putt around town to car shows and cruise nights where the motor is rarely much over the stall of the torque convertor. Is a 850 cfm single 4bbl sufficient to supply fuel? I have a Holley black (150gph I believe)electric fuel pump and regulator that I hope I can reuse. I have been watching some sets of Dart Pro One aluminums 345cc with 2.30 intake valves for $2000 delivered. When I contact the sellers the usual upgrade charge for springs able to handle up to .700 lift roller cam is $150. I don't mind spending a few extra bucks as long as the payoff is worth it. I've had luck selling some car extras here on RJ so now is the time to "re-invest" in my money pit. For comparison sake, what does a set of as cast pro 1 345s flow and how would the difference realistically make on my motor?

Pwmax

With that rather small cam for a 582, and 345 Pro-1's, you will not have to worry about throttle response. It will be VERY tqy and responsive at low rpm. Actualy, if that engine is going into the car in your sig, it will probably twist it in half. You will definately have no trouble spinning the tires.

Frank
Advanced Performance
www.get-ap.com

r8ceredy

No replacement for displacement right?
I'm gonna run a small tire so I don't pretzel it. Some frame ties but no cage. Car is too valuable to cut up IMO. I took the original driveline and crated it. Now I have a 9",th400, and this engine for fun.

r8ceredy

Anyone else's .02?

russ67chevelle

latest trend seems to be run largest lift with moderate to lower duration cams for 3000-7000 rpm range.i cant wait to see what superstreeters dyno says this winter cause i have a 572 and compiling info for a new cam this winter.......