Hello,
Has anyone run Iron Eagle 200cc heads on a 350? Will they work well on a mostly street car with a 350? I would get the 180's but if I upgrade to a 400 in the future the heads would be too small. My cam specs are 224 @ .050" intake and exhaust .476" lift intake and exhaust. My intake is a Performer RPM with a Q-Jet. Exhaust 1.625" tube headers with 2.5" pipes with an X and Walker Super Turbo's. Gearing: TKO-500 with a 3.42:1 differential and 26.5" tall tires. Do you think it would work okay , or would the low speed torque erode to near nothing? The car is daily driven and makes it to the drags at least 4 times a year and to the road course at least twice a year.Thanks in advance.

Regards

CurtiSS 69

Im sure they are not ideal but they will run strong and its not a bad idea to plan for the future like you have suggested and buy heads once.

They will work fine and allow you to up grade for the future.

Yahoo! More fun stuff to put on! Thank you for the responses.

Regards

CurtiSS 69

Max RPM x stroke x bore x bore / 190,000 = minimum port runner area.

Try this formula and see if it works for you. For example you are working with a 350 which probably if using a hydraulic cam isn't going to go above 6000 rpm. Assuming it is + .030 on the bore:

6000 x 3.48 x 4.030 x 4.030 / 190,000 = 1.78

180 would work good for you, 195 or a 200 would work also. Don't go too large.

400 +.030 again at 6000 rpm:
6000 x 3.75 x 3.75 x 4.155 / 190,000 = 1.85

The same 400 running to 6500 would require 1.99 so the 200 isn't a bad choice at all !

Max RPM x stroke x bore x bore / 190,000 = minimum port runner area.

Try this formula and see if it works for you. For example you are working with a 350 which probably if using a hydraulic cam isn't going to go above 6000 rpm. Assuming it is + .030 on the bore:

6000 x 3.48 x 4.030 x 4.030 / 190,000 = 1.78

180 would work good for you, 195 or a 200 would work also. Don't go too large.

400 +.030 again at 6000 rpm:
6000 x 3.75 x 3.75 x 4.155 / 190,000 = 1.85

The same 400 running to 6500 would require 1.99 so the 200 isn't a bad choice at all !

Cool! Where did you get the formula? Are these numbers cross sectional port area in square inches at the smallest point, or is the answer in cc's with the decimal 2 points off? I am confused. Do you know how the formula was derived? Thanks.

Regards

CurtiSS 69

Max RPM x stroke x bore x bore / 190,000 = minimum port runner area.

Try this formula and see if it works for you. For example you are working with a 350 which probably if using a hydraulic cam isn't going to go above 6000 rpm. Assuming it is + .030 on the bore:

6000 x 3.48 x 4.030 x 4.030 / 190,000 = 1.78

180 would work good for you, 195 or a 200 would work also. Don't go too large.

400 +.030 again at 6000 rpm:
6000 x 3.75 x 3.75 x 4.155 / 190,000 = 1.85

The same 400 running to 6500 would require 1.99 so the 200 isn't a bad choice at all !

Actually, shouldn't your 2nd example be:

6000 x 3.75 x 4.155 x 4.155 / 190,000 = 2.04?

:cool:

We have 2 cars with them. 1) is a 72 Nova 355 flat top Comp. 12-609-5 4.56 gears 1 5/8 headders Vic. Jr 750 TH350 5000conv. 11.63 on 28x11.5 et streets. The other is a 406 11:1 4.56 3500 conv. 67 Pontiac Lemans w/ 350lbs + driver runs low 12's thru mufflers with a 750 and same cam and intake as Nova. I would buy Canfields if budget is tight or AFR's. Best to build one motor and stick to it. BBC is best for the money you gonna spend upgrading heads etc on a small block. I just made the swap myself you stock 049 heads and a 2 bolt block. Car should run 10 teens when done :)

remember port area is not exactly port volume. the formula gives you port area. here is how some popular AFRs size up.

AFR195 = 1.98 sq in (Port vol = 195cc)
AFR210 = 2.05 sq in (Port vol = 210cc)

Dirt you are correct, it was late I had game 4 on my mind as we were getting ready to head down to St. Louis that afternoon.

Tokyo you are also correct, but it gets you in the ball park. There is actually a chart showing those numbers for the various port volumes and areas in the book I found the formula in.

I think it is in the "How to build big Inch Small Block Chevys" book. I'll check tomorrow, it's all closed up for tonight.

Dave

I would go with the AFR's personally they are the best heads out there. And 195 or 200 depending on who you get should be fine you will just loose a little torque.