Hi guys, I am rebuilding my 85 roller cam engine and will put a stroker kit, new cam, heads and a roots style blower, so my question is what heads do you recomend? What brand and what parameters?
the afr 185 heads will easily allow you to make enough power to split the 85 block in half with a blower. any middle of the range aluminum cylinder head will make the power your looking for. http://www.summitracing.com/search/...terial/aluminum/intake-runner-volume-cc/185cc
with a blower you will want the bigger combustion chamber size to keep the compression down to pump gas levels.
I was thinking about 200cc, is 185 enough? what do you think abut that? http://www.summitracing.com/parts/wrl-023005-1/overview/make/ford
those should work. with the roots blower you shouldnt have any low end rpm problems that a naturally aspirated motor would have. thats a great price for that head. remember that for 1 head. make sure your figure out your compression ratio. you will need to know if you have the original 85 pistons or if they have been replaced or if you will be replacing them. you will need to know the head gasket thickness also. i would be trying for around 8.5-1 to 9.0-1 compression ratio range. that should work well with pump gas
thanks for mentioning that is the price for 1 than to expensive for me I will replace the pistons, while puting the stroker kit. Can you write a bit more about the compresion ratio? how to calculate and how to control it?
Before you pend a major wad on building a 500Hp fire breather in a stock block you may want to think about this...
One thing you want to keep in mind depending on what pistons you get is the cc of head combustion chamber. If you are going for 331 you will be at 4.030 bore X 3.25 stroke. Assuming you use a .040 compression thickness gasket and heads with a combustion chamber of 64cc you should a rough CR of about 9.3 to 1 which should be fine for 6/8 psi. Just remember, the motor is an air pump...............and the more air you push into it...................the more you need to get out. Be sure to use ARP studs in the mains and although I don't agree with their use, I'd put a main support in for good measure.
http://www.summitracing.com/expertadviceandnews/calcsandtools/compression-calculator look at and play with this. also look through the tech info that summit has. it should answer a lot of your questions better than i can. the nice thing about using summits site is you can look up the piston options and find the info that you need to put into the calculator, all so you can do it with the heads and other parts you need. the split block is know to start happening at about the 500+hp level. usually it happens on engines that are really raced hard. i wouldnt worry too much about the block. just use the arp studs mentioned above and a main girdle wont hurt and may even help. your going to need an engine machine shop to machine the block if your going to put new parts in it. i dont know about the availability of machine shops that are set up for amercan v8s in poland. you will need one if you plan on building this motor. i would suggest finding one and talking to them about how to go about doing this properly.
I was going to build a 347 stroker out of an old 70's block but after realizing I was spending over $1000 for machine work and the girdle and everything else to hold it together at around 500hp I decided to go with a dart block so my block doesnt go BOOM with a blower. so now Im going 363 stroker running 1000 Hp and all I had to do was buy a dart block and I was able to double the power I was going to run and it will be a safer build. atleast as far as blocks going boom anyway lol that 1000 horse engine will be scary for sure. figure out what kind of money you want to spend and double that if not triple that. Im almost $11000 into my motor and I have a little ways to go before its all paid off. I thought I was going to spend around $5000 but NOooo I had to ask too many questions and upgrade too many expensive parts
