Trick flow 240s on milder builds versus Edelbrock RPMs

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DC Dart

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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.
 
Just compare flow numbers. Do the Trick Flows outflow the Eddies at low lift? If so, there's your answer.
 
I don’t have a calc handy at the moment...
This calculation he should know. Missing gasket dimensions as well. I’d like to know something about the cam as well.
Also, what is his best available octane?

I think it’ll be a pump gas engine no problem, just want to be sure.
 
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.

This is a mute point. You don't avoid good or better heads that are of the same configuration because you plan to make less power. I.e...2 standard port heads.

Wondering how the heads would differ around the 500 hp mark.

The heads with the better flow numbers will make 500 easier. The heads with the better flow under the curve will outperform the other head. As said, just download and eval the flow bench charts.

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.

10.5 isn't on the high side, 11 or 11.5 is. When you purchase you cam or have it cut make sure to mention in addition to all the other info you give them, that you plan to run pump fuel. 242@.050 and a 112LSA will make 500hp / >500tq in a 440, more in a 451, and will tolerate pump fuel at 92 octane all day long. Timing curve matters too. It's not just about the total.

Sounds like a fun combo and don't let anyone tlak you out of that solid roller cam.

J
 
i'm curious how the power curves would differ in combo like this if only the heads were the difference (meaning the compression ratio would be different too).

would more torque at lower rpm be expected from the 210cc heads or would the TF 240cc heads make up for the port volume with the excellent low lift flow??
 
If you don’t have heads, and the TF heads are within your budget...... buy those.

If you already have the Ede’s...... I’d use ‘em.
 
If you don’t have heads, and the TF heads are within your budget...... buy those.

If you already have the Ede’s...... I’d use ‘em.
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
.100..........+0
.200..........+0
.300..........+11
.400..........+37
.500..........+58
.600..........+65
.700..........+53

I do like the additional 240 airflow.
 
i'm curious how the power curves would differ in combo like this if only the heads were the difference (meaning the compression ratio would be different too).

would more torque at lower rpm be expected from the 210cc heads or would the TF 240cc heads make up for the port volume with the excellent low lift flow??

In my experience, better heads with more compression will make more HP ata similar RPM and more TQ at a higher RPM.

Those differences IQ52 posted are pretty substantial if you haven't bought heads yet and can afford the 240's
 
Not to mention the more you put in the combo, the more your going to get out of the combo. While that is a “No duh!” Statement, what people sometimes miss is the broadening spread in power as the wick is turned up.

I do like the TF heads. I have no BB heads, so they would be my choice. If you have the Edelbrock heads, now is a good time to decide if any port work to them is within the wallets thickness.

(Edit-spelling)
 
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Just a thought here, will you really need steeper gears than 3.55 with a 451 stroker? Even with the eddy heads are you going to be able to get traction? Without traction, no amount of power, torque or gearing is going to help you.
 
I see your point there, however, depending on tire size/compound and suspension, a street machine should be able to do something.

The wrong tire. LMAO! Even my lowly smog era, ‘79 - 400 smoked the crap out of the 27 inch Copper Cobras with 3.55’s.
 
As power goes up, gear ratio will have to become taller, add an OD, run a taller tire or a combo of all three.

A mild 451 should make 500-600hp, moderate, 600-700, hot..700+

Right now I'm in a bad predicament with mine. I added power and now have to shift OD to trap at 1320 or switch to taller gears.

I've never had the gear ratio I was running affect my car hooking up. tires, shocks, springs, yes. While maybe not ideal and leaving some time on the table, 3.55's will pull just fine through the traps with anything approaching 600hp/600ft/lbs.
 
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?

No. 500 horsepower is 500 horsepower. Besides, I have similar 240 and RPM builds on 440 ci engines with the 240s showing 550-570 LB-FT at 3,500 rpm and RPM heads showing 540 LB-FT @ 3,500 rpm.
 
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Wondering how the heads would differ around the 500 hp mark.

If you had the motor making 500hp with the ootb RPM heads....... removed and replaced them with ootb TF heads...... the difference will be......you’ll have more power.

Even if the power difference at that level isn’t all that much...... the price difference between the two isn’t that much either.
 
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.
 
If should be OK, 92 octane @ 10.5-1.
Your probably going to have a reasonable sized cam in there. Right?

I’m doing 11-1 w/93 available to me.
A Hyd. roller cam is employed @224@.050.
 
If should be OK, 92 octane @ 10.5-1.
Your probably going to have a reasonable sized cam in there. Right?

I’m doing 11-1 w/93 available to me.
A Hyd. roller cam is employed @224@.050.

A decent sized cam and/or a wider LSA. CAm essentially needs to be cut with compression and fuel in mind.
 
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