TS87FC3S

Ive searched and still cant find definite answers, i know most is just preference but ill tell u guys what i do with the car and goal and have you all help me with what style port job and how much and steer me towards the correct templates..

Bearings went out in the 12a is why im tearing apart to rebuild.

Car will be Driven in summer only, not in rain or snow or ice.. nice summer days with plenty of time to warm up.. i will be cruising, slight dd, autox and just have some fun around town.. my goal is min 200 wheel (wouldnt mind more though) and would love hearing brap brap brap.. i also do NOT want to notch the housings

I have a 465 cfm holley (rb setup) and long primary header single exhaust setup (would like to reuse if possible) i will be stepping up the ignition system voltage..

What i need is opinions on port design and size, possible timing help for said port also (baseline) and anything else helpful, thanks in advance

Jeff20B

iTrader: (13)

My recent half bridge turned out well. But you gotta keep the runners separated.

rx71king

iTrader: (6)

na 200 hp street car... not happening...... mild street port and a turbo will get you there

diabolical1

iTrader: (3)

the only thing i can speak on from experience is a streetport. 200 the hard way ....

a bridge (half- or full-) would be the next step.

ArmyOfOne

iTrader: (12)

Bridge or P-port is the only way you will get to your HP goal NA. As for the 465 Holley, you will need bigger to get to that HP. I was able to squeeze 225 from a 6 port 13B with a 600 Holley.

It is doable... but it will not be quiet!

TS87FC3S

not to worried about noise and im not running a turbo, im down to 2050 lbs and dont want to add all that weight to the front of the car.

diabolical1

iTrader: (3)

then by all means, go with a nice bridge.

81WideMariah

iTrader: (8)

All the weight??

If I had to weigh everything on my turbo set-up, it couldn't be more than 100 lbs.

Building a bridge is fine and all, but you'll need a bigger carb, a more open exhaust, and engine life drops pretty considerably.

Turbo builds more torque, requires less aggressive porting to achieve the same HP, and you could boost prep your current carb. Sounds like a no-brainer to me

TS87FC3S

also trying to do this on a tight budget, boosting a rotary decreases engine life also, what would be the biggest port I could do with my 465 and what kind of hp would I be looking at.. I was making 120 wheel stock port, I want the car to be fun but also want to be able to turn corners without alot of throttle modulation to keep car from breaking lose 24/7, my goal was 2k lbs and 200 hp

Jeff20B

iTrader: (13)

I'd recommend 74 spec ports (50 degrees ABDC) on a 465 Holley, but it won't get you to 200HP. Good for coming out of a corner though.

Question. Do you have an RB intake manifold with fully separate runners? Then I'd recommend 74 primary ports and half bridged secondaries. However if you have an open spacer or your Holley has any kind of pri to sec communication, I'd not do a half bridge.

Crispin38

iTrader: (3)

Just go with a big street port or you could do something similar to what I have. Stick with your same carb and exhaust too, that'd be simple and I don't see anything wrong with it.
You will make power. Not 200 RWP..

Jibaro 12A

iTrader: (8)

What they said. I'd go turbo and a nice SP. It can be done at a reasonable price if your willing to get your hands dirty.

TS87FC3S

YOU HAVE ANY PICS OF UR PORTS, crispin.

also im a technician and dont mind getting dirty have every tool i could ever need at the shop.

TS87FC3S

It does have individual runners, according to rb tech

Jeff20B

iTrader: (13)

That gives you the option of going half BP. But is it a good idea for your specific needs? I can't answer that.

Crispin38

iTrader: (3)

Imagine porting all you can without decreasing corner seal longevity. That's what I have. The Rotary Doctor can tell you more about it than I can, as far as size. I haven't actually seen it. But, I know what it was intended for and who originally did it, and how much power it makes to the crank.
I'd call him and mingle. He'd be a big help with your original questions, I gave you his number. Start dialing, thursday is the best day.

TS87FC3S

what would a halp bp do power wise and how is idle and driveability

Jeff20B

iTrader: (13)

I don't know about power. You'll have to ask someone else to answer that questin. The idle was ok on my setup but I used a Nikki and an old school separated manifold. All later manifolds have channels so can't be used on half BPs. If your idle is fine now, it will be degraded a bit with a half BP but still be able to idle ok.

diabolical1

iTrader: (3)

speaking only for myself, i think i saw your 200 horse comment and somehow ignored everything else - not seeing that you planned to keep the 465 and the single exhaust. so here is my "if it were me"-scenario: i'd do a nice streetport, tune it as best i could and call it a day. you likely WON'T see 200, but i really don't see you being disappointed either. that, and you can do everything you said you want to do with it.

TS87FC3S

Can I use the 465 and exhaust on a half bp

DriveFast7

iTrader: (1)

Agreed. To get the most out of a bridge you need to collect the exhaust pipes at the right spot. That plus your 465 = a nice streetport and <200whp.

TS87FC3S

d like to keep the 465 and exhaust but I'm not against changing them just would rather not and save money

TS87FC3S

stock primary's, and big bridge ported secondary's.. since i have individual runners on intake.. and race port exhaust? could this combination work well

PercentSevenC

Here's a clip of the HBP 12A that Jeff built so you can see how it idles:

http://www.youtube.com/watch?v=nWQ38ee1nLU

TS87FC3S

seen that vid i like it!!