what size windsor

[scrape]

OK GUYS, HERES THE QUESTION FOR YOU HOT STREET AND OUTLAW RACERS. I AM PUTTING TOGETHER A NEW SHORTBLOCK TO GO ALONG WITH MY NEW HEADS, TO DO A LITTLE OUTLAW 10.5 RACING , I AM HAVING TEA WORK A SET OF TFS R HEADS FOR ME, I NEED TO KNOW WHAT A GOOD BORE - STROKE- ROD LENGTH COMBO WOULD BE, IT NEEDS TO 750+ ON THE MOTOR AND 1000+ ON THE DOPE , I DONT WHANT TO BUILD THE BIGGEST THING I CAN, IM MORE CONCERNED ABOUT IT MAKING HORESPOWER EFFIECENTLY, I HAVE NOTICED THAT ALOT OF THE OUTLAW AND HOT STREET GUYS ARE IN THE AREA OF 360-410 CUI IF ANYONE CAN GIVE ME SOME GOOD ADVICE I WOULD APPRECIATE IT
THANKS SCRAPE:confused:

[mean lx]

What type of block are you using? It is better to use a larger bore, such as 4.125 with a 3.75- 4.0 inch stroke, provided your heads flow enough air to support a 400 plus c.i. motor. The larger bore unshrouds the valves improving airflow. This explains why two engines of the same size, heads, intake and cam ect., the one with a larger bore and shorter stroke, makes more power....James

[scrape]

THANKS FOR THE INFO
SCRAPE

[LX427]

you think a set of AFR 225s can support a motor with a large bore and smaller stroke?

[mean lx]

What do your heads flow? In an all out race motor, I would select Blue Thunder or Yates; if cost did'nt matter. I'm not real sure about the airflow of AFR's, but it would depend on who ported them, how much power you wanted to make and how high you wanted to spin the motor. Don't you use the AFR 225's? How well does your car run? .....James

[LX427]

It wont be an all out race motor. The heads are CNC ported and flow 320in/250ex. Ive got the cam ground for it. Its a 686in/672ex lift. Havent got em yet but those are the ones Im looking at getting.

Probably gonna spin it to about 7000-7500rpms. I want to run some mid 9s with the 300 or 400 shot.

[mean lx]

As long as your suspension is set up properly , you should have no problem running those numbers. As long as your car is not too heavy...James

[racer7088]

You need to look at the rules to see why any racer is doing anything. It's gonna be for that reason and that alone. You need a certain amount of comression height per the HP you're expecting and then you should run the most size you can if you want to save money. RPM is what costs money and with todays heads you can run out of RPM with too small a motor before the heads have given up. If you want 750 on motor it better be a 427 or so or your already looking at Ti valves and shaft rockers etc. I'm sure Brian can tell you all you want about NOS since if you are doing a 250 shot you will need to figure that into your build from the get go which will necessitate more piston top. It depends on which block height and everything else you will do. If you ever want to race it you better look at the applicable rules.

[LX427]

Its just being built to run, not for any specific class.:D

[Windsor377]

Scrape,

Don't worry so much about displacement as combination. One person asked about the block. That's important. But the most important thing is that everything work in concert. Keep in mind a small motor wants rpm and everything that goes with it!

Do you have flow numbers on the head yet? If you want to spray it I'd say give yourself a nice piston CD cusion of 1.300" and work backwards from there on stroke. Don't go balls to the walls on piston to head. Take as much bore as the block will give you (sonic). If you're conservative, leave room for one clean up.

Run a lot of CR (14.5 +, hopefully with reduced chamber size with small dome) but with a lot of cam on wide lobe centers (112).

If the heads flow around 350 @ 28" with a good exhaust side bias, on an honest bench, you won't have any trouble making that 750hp on motor....headers and intake will need to match the engine.