is 750 hp possible with iron stage one heads. i think you need 330 to 340 cfm. has anyone ported these heads to flow that much. thanks for any help.
The most flow I have ever gotten out of iron stg-1's was right at 304 to 306 cfm, I believe I've seen some posts of someone pushing about 310 cfm. I don't see of any way to get 330 to 340 out of the factory iron heads. Me personally, I would go the alum head route, for the horsepower you are looking for, that would be your best bet. Jim Burek
Have to agree with Jim. When I was running iron Stage 1 heads they flowed about 300 cfm in the intakes. Gessler did the heads and they were about maxed out I was running in a 3150 pound car in the 9.80's. Rob Chilenski who is still running the iron heads until the end of this season has gone 9.43. at 140. at Cecil County in perfect weather cond. He too has extensive head work and his '70 Buick weights about 3200 also. As with going the more practical route, go aluminum. It has more potential and most likely cheaper to set up as the heads flow better than the irons right out of the box. Plus there are some good deals out there right now. I switched over to the Stage 1 TE heads (why those, just by choice) on the dyno I pushed out 780 hp at 7,000 rpm. Now I'm hearing there are other combos that you don't have to zing up the engine on the rpm's by using a blower and it makes your Buick streetable.
Hey Doug have you've been looking in the mirror again:moonu: Thought it was Cecil Doug. Regardless where he ran it, it is impressive, no doubt that number should go lower this fall.
Well here we go on iron head flow #s.My heads flow 277 on the in. at 650 lift and 213 on the ex at 650 i think it can be done ,if you do the math my car made 695 hp to the ground to run my 9.57 @ 138.90 and ive run about 6 9.59s and a few 9.58s. thats a 67 gs at 3250 #s that was with a 468 ci with all heavy stuff in it the pistons were BME, the rods were eagle 6.635 so it made big power for the ci .So its up to you what you want to run the new heads are lighter and flow way more but ive proved big flow #s dont mean anything !!!!! ive out run many stage 2 @ 3 cars by bus lenths. well over the winter we will be digging in to the 482 ci motor that im buying, its run very quick with stage 2 heads on it in doug heckers car and im going to try it with just putting my heads on it so i will post my runs to see how my heads compare to the stage 2s that were taken off.me and my machine shop will be changing alot of stuff in this short block and with the new combo look for my gs to break some records.I WILL NOT TAKE MY IRON HEADS OFF TILL MY CAR RUNS IN THE 9.30 ZONE AND I THINK WE CAN MAKE IT HAPPEN. (TORQUENSOVER)
If you know John, then you know he'd be likely to get his 9.30 and then spray it on the next pass!ou: He's never been a stranger to the giggle juice.:laugh:
If you are starting from scratch, don't spend a dime on those iron heads. Sell them on ebay. Cast iron is a pain to port and plus if it ever cracks, it is a bigger pain to fix, if you can find somebody to do it. I still do not understand why people keep the iron heads and invest all this port work and money in them. You still have a 30 year old set of heads. Plus might I add, less weight. I have fixed a few aluminum heads and 1 block with a mig welder. Try doing that with cast iron.
