598CI Build

[mike87]

I am going to start to build a 598ci BBC, here is what im gonna start with: dart big m block, callies 4340 forged crank, callies 4340 forged h- beam rods, srp forged pistons, looking to make anywhere from 700-800hp, was thinking about going with dart pro 1 heads:325cc, 119 chambers, 2.30-1.88 valves, ive never built a big block yet and was wondering how you guys would go at building this engine with what parts, what heads, intake, cam, lifters, rockers, etc. you guys think i should use, it is going to be mostly a streeter, the motor is going in a 4500lb. 4x4 truck, currently have a th-400 built up with a 3000 stahl converter, and a detroit trutrac with 3.73 gears, dont need it to rev any higher than 6500rpm, just want a badass motor than can be driven on the road and be real reliable, was thinking about going with a solid roller, and 10-1 comp.. any help appreciated mike.

[mike87]

I did a little research and think i might run these parts:
AFR magnum alum heads- 345 runners - 121cnc Chambers- 2.30/1.88 valves #AFR2110-1 or maybe 325cc runners #AFR2101-1
AFR says the 345cc heads are more for 3500-8000rpm and the 325cc heads are for 3000-7000rpm here are the flow #s of both at .660 lift- 345s: 391/281CFM and 325s: 379/282
Edel. Super Victor Intake #2916
AED Pro-Street 1050CFM Dominator #AED1050PS
howards mech. roller cam .050:248/248 - ADV: 285/285 - LC110
Lift:.660/.660 - #121313-10
Isky Redzone max Roller lifters #272-96-RH
Comp Cams Ultra pro-magnum Roller rockers 7/16 - 1.7 Ratio #CCA1620-16

I know those 345cc heads are not to big for the motor but maybe for what i would use them for, i like the intake flow #s of the 345s there definately higher than the 325s, but the exhaust flow #s of the 325s is just 1 cfm higher than the 345, highest ill probably rev her to is 6500rpm, it sounds like i should go with the 325s unless i get a bigger cam with more lift then those 345s would probably shine more, but i dont want to go to crazy its going to be mostly a streeter.

what do you guys think, Mike

[Big Dave]

My experience has been a 4.600 bore is too much for the street. You can not get the rings to seal (or I at least can not get them to seal up at low RPM found on the street) but I am using low tension rings with gas ports (Big-M Dart block was finished honed with head studs in place with an aluminum block plate, using forged (I almost said JE pistons my usual vendor but they didn't have any for me when I built this thing so I bought them from Mahle instead). They are full floating with 6.385" Howards 4340 rods in a short deck block so they have tiny skirts which I think is my problem with the piston rocking and unloading the rings.

Since you have room in a truck I would use a taller deck block with your 4.5" stroke, and run a 4.500 bore. You can always bore it out more latter on a rebuild since you are not going to have to stick to a 500 cube limit under the rules the way a pro stock does and have a trailer full of offset ground cranks to match a 0.004" hone refurbish job from disqualifying you on tear down.

Big Dave

[Blown65]

I'm confused why the 4.5" bore will seal and 4.6" won't. If you put the proper ring in, finish the cylinder with the proper grit, correct piston to wall clearance, proper ring gap, proper break in, and no synthetic oil for at least 2000-3000 miles. What does the extra .100" matter?

Kinda curious


Corey

[SMOKEmUP]

[robins44]

this thing is going to be nucking futz! Cant wait, hopefully he will be a good freind and hook me up with some of his sbc stuff! Does anybody know how much abuse there is on one of these 231c transfer cases when there in two wheel?


Cody

[Big Dave]

Shouldn't be any at all. There is no power entering the auxilary tranny (other than from fluid friction dragging the parts around) when in two wheel drive.

Big Dave

[nomad239]

USE THE AFR 315CNC CYLINDER HEADS.YOU SHOULD ALSO CONSIDER ZERO GAP RINGS.

[robins44]

Sadly this build never happened, decided to stick with his 383, which is no slouch btw.



Cody