[bygddy]

Bolt on a plain Jane rpm, skip the air gap, intall a "good" 195-210 head, hit the same dyno and see 100 more HP to the ground. The better your combo is, the worse the 882's are, and the bigger the gains are going to be. And that performer is also killing you.

[bygddy]

Oops.....yep, what ap said.

[Caballerokid]

I believe thats possible. I just don't understand why the dome pistons make it more difficult? If thats the case then why to race motors use dome top pistons? I understand things need to be matched properly but I don't understand why the domes seem to be killing me so bad???

[hcompton]

The 64 cc heads can be a little less cc pretty easy just sink the valves down on into the seat a little further and smooth over all the sharp edges in the chanbers you will probably be at 65 66 cc a little mor etriming and you got 68 cc which should solve your issues.

If you buy new alum heads you will be able to request the chambers be worked over to any cc size you need. Best to buy ones that work. But in this case some triming may be in order done right it will also lessen the chance of detonation.

[cobalt327]

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[bygddy]

Originally Posted by Caballerokid

I believe thats possible. I just don't understand why the dome pistons make it more difficult? If thats the case then why to race motors use dome top pistons? I understand things need to be matched properly but I don't understand why the domes seem to be killing me so bad???

Because they hugely limit your head choices, they are more prone to detonation, and the why race motors use them is simple....13:1 and up from there. That being said, there in, leave them there, go more aggressive on your cam choice, buy the pro-filers in 72cc form, 195's would be enough, have your pump gas friendly 10:5, and make well over 400hp all day without turning it to the moon and risking reliability.

[Caballerokid]

I have an standard rpm intake to put on already. I actually had the center milled out like on the rpm air gap so I can take advantage of the extra 10hp and 15-20tq at the bottom of the curve that the rpm leaves on the table. Trust me, I want this to work!

[vinniekq2]

FYI the Mustang dyno is the heart breaker dyno.The numbers from a mustang dyno will read lower than a Dyno-jet dyno. The Mustang dyno is easier to tune the engine as you can vary the load to the engine and keep the engine from running a higher RPM than you want. The Dyno-jet dyno is strictly inertia,there fore cannot hold a load on the engine,just measure the speed that the car accelerates on the roller.

Your torque being so much higher than your horse power(reguardless of gross numbers)indicates the camshaft and or heads are not enough for your engine.
Typical of most v-8s.

[Caballerokid]

Ya Vin, i know all the sad mustang dyno stories lol. When I saw the tq number so much higher than the hp, I know it just wasn't breathing like it should be. So when selecting a cam, roller or flat tappet. Is there any benefit to having matched durations between the int/ex or stick with the splay of say the 225/230?

[vinniekq2]

The extra duration on the exhaust side is usually to compensate for weak exhaust flow. If you heads flow 75-80% on the exhaust then single pattern is good(N.A.) turbos and blowers use different rules.There are exceptions to this rule as you will soon find out when others jump in and point out the times

[Caballerokid]

So, as far as budget and power goes I'm thinking this cam with the pro-filer heads and my 1.6:1 SA roller rockers. Some make solid power through the band. Or I could go slightly farther up to this cam, which would move the power up slightly higher in the rpm. Or would a single pattern be ok for the pro-filer heads?

Pro-Filer 195cc 2.02"/1.60"

.100" - 145/101 69.7%
.200" - 205/144 70.2%
.300" - 255/175 68.6%
.400" - 278/194 69.8%
.500" - 281/205 73%
.600" - 282/213 75.5%
.700" - 283/219 77.4%

Data from http://users.erols.com/srweiss/tablehdc.htm

Thoughts???

[ap72]

Originally Posted by Caballerokid

So, as far as budget and power goes I'm thinking this cam with the pro-filer heads and my 1.6:1 SA roller rockers. Some make solid power through the band. Or I could go slightly farther up to this cam, which would move the power up slightly higher in the rpm. Or would a single pattern be ok for the pro-filer heads?

Pro-Filer 195cc 2.02"/1.60"

.100" - 145/101 69.7%
.200" - 205/144 70.2%
.300" - 255/175 68.6%
.400" - 278/194 69.8%
.500" - 281/205 73%
.600" - 282/213 75.5%
.700" - 283/219 77.4%

Data from Stan Weiss' - Cylinder Head Flow Data at 28 Inches of Water -- DFW / FLW Flow Files for use with Engine Simulation Software

Thoughts???

you'll want a split pattern if you're worried about peak hp. If 6500 is your max rpm then get the bigger cam, if its 6000 then get the smaller one. If the 72cc chambers work with your domes then you may be able to squeak by on pump premium if you have a perfect tune and don't put a huge load on the engine.

You've gone from looking at $400 set of heads though to a $1100 set of heads and a $400+ cam kit...

[Caballerokid]

Originally Posted by ap72

You've gone from looking at $400 set of heads though to a $1100 set of heads and a $400+ cam kit...

Ha, ya I know... but if it means quality and hp, its worth it. Also, the cam was always in the near future. I've been looking at the SHP heads for awhile too. So not too far off from what I was really thinking it would cost. I was just hoping to come in under the wire with a decent set of vortecs. Thats why I asked lots of questions. I like to know all my options on the table and then make an educated decision. 10 years ago, I was still getting my feet wet. I have learned a lot since then! Thank you guys for all your help!

[ap72]

Originally Posted by Caballerokid

Ha, ya I know... but if it means quality and hp, its worth it. Also, the cam was always in the near future. I've been looking at the SHP heads for awhile too. So not too far off from what I was really thinking it would cost. I was just hoping to come in under the wire with a decent set of vortecs. Thats why I asked lots of questions. I like to know all my options on the table and then make an educated decision. 10 years ago, I was still getting my feet wet. I have learned a lot since then! Thank you guys for all your help!

If you can do all the work yourself the Vortecs aren't a bad deal, but if you sink any money into them and they crack then its a total loss. And MOST of them crack. With a quality aftermarket head like the profilers you're not just paying for a better port and chamber but also MUCH better durability. While that won't make more power it can save you a lot of money in the long run.

Its one of those "pay now, or pay more later" deals.

[Caballerokid]

I understand. Im actually really excited about the Pro-Filer heads. They flow CRAZY for the price and as much competition as there is in the sbc cyl head market. Matching those with a powerful roller cam im very optimistic of the power that can be made. Thanks for all the advice and options you guys gave me.