Narrower bleeds more compression...Wider LSA will be more octane tolerant
LOL, reminds me of a old beer commercial...
Tastes great
Less filling
Tastes great
Less filling
TASTES GREAT
Less filling
Narrower bleeds more compression...Wider LSA will be more octane tolerant
Narrower bleeds more compression...
Sorry you missed the humor.Okay, I'll bite. Explain how that works.
I would add 10° to that.Looking at cam profiles. A Hyd. roller cam @224@.050. as rumble fish mentioned is where I will start. was thinking a little more. All the input is appreciated guys.
Looking at cam profiles. A Hyd. roller cam @224@.050. as rumble fish mentioned is where I will start. was thinking a little more. All the input is appreciated guys.
Actually not a bad idea on a few fronts,I would add 10° to that.
So the trick flows perform the best even at the lower power levels. What are the thoughts on compression? The Edelbrocks would be around 10to1 and the trick flows would be around 10.5. 440 source list my pistons at -.025 in the hole being 10.4comp and 9.9 with 84cc. with .039 head gasket. I am down .008. Premium is 92 octane around here.
And I apologize for being one of the guys that asks questions with limited info. Cam is undecided but going roller. planning on sniper fuel injection with their distributer and TTI headers 1 3\4. Performer rpm intake. Have the heavy main 230 block with main studs yeah( typical core shift waah). Can get the Eddys for about $660. cheaper than trick flows. But if the compression is not to high would go trick flow.
Hello. New to the forum. I was wondering at what level of horsepower the trick flows become more advantageous over the RPMs. A lot of people are using the trick flow heads in the 550 plus horsepower level but how do they perform around 500hp. Would the RPMs have an edge in the lower horsepower levels?
Where I am going with this is that several years ago I bought a 440 source 451 stroker kit and had a 400 block machined and prepped. At the time Edelbrock RPMs were the plan with 84cc chambers. I had purchased the 4cc flat top pistons for around 10 to 1 comp. Pistons approximately .008 in the hole. The Trick flows 78cc would be a half point higher approximately. Not sure when I will have time assemble and get solid numbers. Wondering how the heads would differ around the 500 hp mark. Going to run a roller lifters and a cam in the 230s 240s duration range @.050lift? I am wondering if I should go the trick flows even though my compression would be on the high side.
The car is a 68 Dart will be 4 speed or t56 with 355 gears. May go steeper gears later. Maybe hit the track on occasion but main use would be fun street car.
Thanks for the reality check Andy. I bought the stroker kit from 440 source and had the machine work done around 10 years ago. 84 cc Edelbrocks RPMs were the plan. Years prior to the trick flows being an option. If I was to have started a build in the last year I would have gone the 470 route with a 12cc dish piston for trick flows. 10 years ago I debated 451 versus 470 went the proven route at the time. I do have Edelbrock RPMs 60925 ordered and I do not think I am going to cancel it now. They were on sale. My pistons are .008 below deck the compression will be higher than I want with the trick flows.
If I stay with a 4 speed I wont have to hack my freshly painted floor and scrape up my dynamat which would be a plus. Soooo I may be falling off the Trick Flow wagon on this project. But the 440 RB in the GTX will be a good 500ci Trick Flow candidate someday. I am going roller lifters and fuel injection still which was not the plan 10 years ago. All the input from everyone is appreciated very much.
What Andy says about being able to port the RPM heads later is true. A well ported RPM with larger valves will lack very little when compared to the 240 Trick Flow gains quoted above.Sage advice. If you already have the RPM heads......use them.
Simply for reference, on my bench with the only OOTB 240 heads I have tested, here are the airflow differences vs OOTB RPM.
Lift............240 additional cfm vs OOTB RPM
.100..........+0
.200..........+0
.300..........+11
.400..........+37
.500..........+58
.600..........+65
.700..........+53
I do like the additional 240 airflow.
I was just thinking as I was reading the title of this thread on the home page, If you replace small valve, small port, open chamber heads with closed chamber, big valve, big port heads it has got to be a very noticeable improvement.Valves being the key there. While numbers vary some bench to bench, when I did my research to get my heads done, a standard valve ported RPm would do around 320's. With the oversized intake valve they'd do 340's.
I can't say enough for what a good set of heads does for an engine.
Yes it's true. I personally know that a single 4-bbl, pump gas 451 with ported Edelbrock RPM heads can make 720-770+ horsepower. Pull...after pull...after pull...after pull...with a one pull peak of 786.9 HP.I was just thinking as I was reading the title of this thread on the home page, If you replace small valve, small port, open chamber heads with closed chamber, big valve, big port heads it has got to be a very noticeable improvement.
What Andy says about being able to port the RPM heads later is true. A well ported RPM with larger valves will lack very little when compared to the 240 Trick Flow gains quoted above.
Lift..............Ported RPM cfm gain vs OOTB RPM
.100..........-7
.200..........+0
.300..........+9
.400..........+34
.500..........+41
.600..........+65
.700..........+60
Now this is funny.
Some warriors from the dark side called and said, "We've seen what you can do and we need your help. We are shipping you some iron Ford FE heads. Just make them work."
Interesting in that almost 30 years ago Dad was doing the same thing for Ford.....but I have no samples of his work.
A couple years back we did look at the Edelbrock aluminum FE offerings for some people.
Hmmm, the iron ones are now in the shop.....retirement may be out the window.