I'm in the process of building up a race 305 that will only be used at the track. I'm going with solid roller and was wondering what the biggest i could go. I will be running a 600cfm double pumper, either a Perfromer RPM air-gap or a brodix single plane, and the 58cc trick flow heads. i was looking at these and figured 3000-7000, would be the best range to run in. i will do gears and converter after I figure out the engine combo.

CRN-118131
242 int./250 exh.
0.580 int./0.600 exh

CRN-118521
244 int./252 exh.
0.543 int./0.561 exh

CRN-118571
232 int./240 exh.
0.525 int./0.543 exh

LUN-50157
248 int./248 exh.
0.555 int./0.555 exh

CRN-118581
240 int./248 exh.
0.543 int./0.561 exh

CRO-00427
260 int./266 exh.
0.585 int./0.597 exh.

Any suggestions?

 

why are you building a 305? it's been said before and bears repeting if you missed it, unless you're restricted by class rules build a 350. why are you set on a 600 carb? class rules? doesn't seem like the two intakes would both be on a lsit of intakes you're considering, that is both are worlds apart. what are you going to do with it? a little more info would go a long ways

 

I like to be different. I'm not building the fastest car I can, I'm building the fastest 305 just to say its a 305. I want to fast in the 1\4 mile and that's it. And the two manifolds are the perfect fit for the rpm range in the single and double planes. So I was wondering if I should go double for more torque, or single for higher rev range. And please stop the build a 350 comments, I've seen it and frankly its kind of annoying. I have a 400 so I know bigger is better. But better isn't always fun.

 

build a 350 and lie

 

Just curious, would it be a 3.48" stroke 305, or an overbored 302?

 

It's a standard 305 that came with the car. So no one has any suggestions?

 

building a 305 isn't being differant considering how many of them are out there. want to be differant try building the 2.5, a v6 or a BBC and running it in a 3rd gen f body.

 

I think you are a little high on your RPM range. Shot for 6,000-6,500 as a max RPM as over that it will be tough to get enough airflow through the engine to make anymore power. You will loose torque on the bottem and won't be able to regain it at the top-end which is a bad thing. That would mean pick a cam with a powerband of like 2,000-6,000 or 2,500-6,500.

 

Thanyou Fast 355, that's the information I was looking for. Is there a certain amount of lift that I should use as a max?

 

The amount of lift where your heads stop flowing more, also what you realize you can not use big intake valves because of the bore size on that thing? What size valves you running with those heads? Your gonna have to notch the cylinder walls if you wanna use em.

 

One of the members here, MELeigh used a set of LT1 heads converted for SBC1 according to the info on this site
http://www.lt1intake.com/
He used those heads on his 305 with a flat tappet solid lifter cam and a carb intake.
The LT1 heads have 1.94/1.5 valves for a simpler fit with the 305.
For a solid roller cam though, aftermarket valves are recomended for durability.
A guy who's good at porting can get good flow out of some LT1 heads up to about .600"

 

i have a solid roller for sale if you're interested

https://www.thirdgen.org/techbb2/sho...hreadid=300379

 

I will be purchasing the trickflow heads and they have 1.94\1.50. I know that's the highest I can go. So I'm pretty much just left with whatever will fit as far as cams go. Thanks for the help.

 

I think Edelbrock's aluminum E-tecs would be better.

 

I would just get some built up vortecs. I bet fastburns would even work. AFR used to make a 305 head as well. Also if you read the fine print in Edelbrocks catalog their performer heads will work up to .450" of lift on a 305. You could use a cam designed to work with the stock 350 lift rule that many tracks have.

 

i would go with the crane-118521 use a 1.6 rocker intake and 1.5 exhaust. as for heads u can call up afr and get some 180's or 195's with 1.94 1.5 valves. then have them mill them to 58cc. get the single plane and some and some 4.11 to 4.56 gears and a 4500 to 5000 stall. if u don't have a carb yet get a 650. this combo should run pretty good. good luck and let us know how it turns out.

 

Ok well I just ordered the cam. But as far as the heads, trick flow came out with some 58cc heads... do these compare to the AFR's? And I already have a 600cfm carb tuned for the upcoming cam.

 

Most of the guys who have TFs like them. But I think you'll be hard pressed to find anyone here who's tried TFs or AFRs or any alum head on a 305. If there's anyone it would be interesting to hear how thier car's running though.
Guys say that AFRs have a long delay between ordering and shipping, but I don't know itf that's true with the heads you want.
http://www.chevyhiperformance.com/te...98/index4.html
The flow figures in that article might be of help.

 

why would you use the 1.6 for the intake side, I'm considering a 305 build with a sold roller and a set of holley alum heads, or a set of corvette 58cc heads. id love to build a 305 and later turbo it. So I'm just curious

 

You can only get so much air through a small valve so the TFS would work fine, dont think AFr makes a head with a small valve like that.

Solid roller in the 230ish range@ 050 on a 305 is about as big as Id go (maybe even smaller), they are out there, Guldstrand ran one on his GS80/TPI car, have heard it in person sounds nice and passes smog too. It was small but ran great

600dp and your intake should be Ok along with a 1-5.8 header.

Havent looked at the tfs numbers but would guess they move some more air than the 113 heads. Doesnt mean you cant work yours over and pick them up.
225-230 int is realistic with the stock valve size