Trick Flow 270 combos!

Trying to get an idea what people are making for power with these heads.
I have a 511 low deck that’s gonna get a set. Can’t seem to find much google searching.
I’m aware of Andy F. articles but would like to hear more experiences.

I just got mine together and am working out a few issues. I am trying to use E-85 . Birdtracker

It’s not really that much different of a head than a ported EZ head.......like an EZ295.

Power should be very similar if the heads got swapped on the dyno.

Duane,
I’m mostly curious about different combos and different power combos. I’m
tempted to just make it 11 to 1 and use a moderate low maintenance cam with
a 3:55 gear and 3500 stall if I can still make 650+ horsepower and same torque.
Trick flow claims 685hp with a very mild build that I’m skeptical the average person
would see the same numbers. It’s a flat top piston so I can also get it up to around 12 to 1 or so and use a solid roller.
It’s for my Dad and he’s making me make these decisions lol.
The short block currently has a 274@050 solid .590 on 108 and I have a converter that will flash to 4700.
The short block was in my race car but had small sidewinder heads fully ported.
I never really got that combo sorted.

Well, the top end is already sorted out.......
500”, decent cam, enough CR, ......... 700 wouldn’t be that hard.

The “intended use” dictates several of the decisions...... including the cam.

The intake, cam, carb, headers can easily move the number from under 600...... to over 700....... from the same basic long block.

That's correct. My 11:1 CR with a Dwayne Porter cam made 713 hp and 709 torque for my street/strip motor. Max HP rpm was around 6000 rpm. 505 CI.

Those are great numbers 👍. How much camshaft? I’d like to stay at .650 lift or less and a lobe that doesn’t eat springs.
I also have the trick flow intake for it. May take some creativity to port match.
Can I make similar numbers with a hydraulic roller? Or will it require a solid roller?
I want something that can go 40 mile trips and maybe go 4-5k miles before swapping springs
And rebuilding lifters.

mine is 12.5-1 540 ci with 270s, Comp 665 roller with a single 1250 E-85 dominator in a 2600 pound street car. Drove it down the road I live on once so far. Figuring out a few minor issues. Valve covers were not flat, had to get them milled and had the wrong coil on it. Hopefully this weekend will be good enough to get it close enough to go make a few passes at the track. Been saying a prayer every night!!! Birdtracker

been running mine for a couple years , is an RB though . Both a 440 and a 505 .

I run solid flat tappet cams , no rollers so I am sure I am leaving some hp on the table . But mine is my daily as well as bracket racing . Raced on 98 pump gas and through the exhaust .
The 440 went 10.71@126+ @ 3690lbs . 520 nett lift solid ft .10.75:1 . 30"tall radial 6000 stall
Factory block 505 10.25@129+ @ 3690lbs .600 nett lift solid ft .11.0:1 . 28"tall radial . 5000 stall
World block 505 10.27@130.8 @ 3780lbs .600 nett lift solid ft .11.0:1 . 30"tall radial . 6000 stall
The cams a not aggressive ramps because of use .

Tex

Mine is under .650 lift. Talk to Dwayne. I run the Mopar 337 intake.

My experience with hydraulic roller = DON"T!

My plan is to get a cam from Duane when that time comes. I’d prefer a solid roller for this build.
Just not sure how aggressive I want to go yet. This will be a street/strip car. I’d like to stay between 260-270@050
and .650 lift. If I can make 700@6k rpm that would be amazing.
337 won’t work for me as it’s a low deck, but an Indy intake won’t be out of the question.

My duration is under 270. Mid 260's.

Thank you 🙏. I’ll contact Duane and tell him I want similar specs.
Do you remember what your torque peaked at? And do you have times yet?

I don't really know what rpm the torque peaked at but it was low. Peak torque was under where we were starting the dyno pulls. We started one pull lower to see peak torque but can't find that sheet right now.

I have not yet finished the car. I need to get moving on it...........

512 low deck, 10.25 comp, mild solid roller 254 duration, 630 lift. dyno'd on 91 pump gas. 700 HP and 670 ft lbs.

Yeah that is about what I'd expect. We did a 505 with a solid roller and 270 heads last year that made a little over 700 hp on the dyno. It is in a Belvedere now and is running high 9's. Another 505 with 270 heads also made right at 700 hp with a street roller cam. It is going into a RoadRunner but the car isn't finished yet. I would expect 700 hp from a 505 with 270 heads if it set up for bracket or even street/strip with a decent solid roller cam.

Thank you Andy! Does it seem these combos have diminishing returns the bigger the camshaft you go?
If you 252@050 cam will get me close to 700 and a 265@050 only gains me 15 more I’d rather just get the best bang for the buck and not try to squeeze every last pony out of it.
Where’s the point of little return or am I off base?
Also do you feel a hydraulic roller could get close to the 700 mark?
I know trick flow claims 685 with these heads and a mild build but I’m not sure as an average builder without the use of exotic parts I’d reach that with the same combo.

I agree with you on the 500+ stroker large duration cams. I'm in the same position with my street/strip 12.5:1 511. Currently using a 270@50/.645" and thinking smaller with more lift might be the ticket. Seems the 470's handle a lot more duration than the 505, 511's do. Also in a medium to heavy street car, something on a 108LDA would work real nice instead of the common 110,112LDA, without power brakes. Being that 500+ strokers make power down low and big duration cams make better power up high in the power band, it does seem a big cam in a 500 stroker in a street/strip car would be a bad combo. Maybe someone here can prove this wrong. I would like to see those combos.

It seems to me from my research these are basically a 700hp cylinder head on pump gas and more hp requires gas ported pistons, vacuum pumps, fully ported intake, etc.
Maybe I’m wrong but that’s where my research is leading me.

How about the 470 using TF heads other than Andy's is anyone making close to or above 700

Mopar Dave I don’t know if I’ll ever order a cam for a mopar high performance engine with more than 108lsa ever again. I just did a cam swap from a small 230@050 112 lsa cam to a 243@050 108 and the difference is staggering. I actually gained power everywhere from 2500 to 6500.
I don’t have any proven numbers but seat of the pants I’ve never gained so much power from a cam swap.

IMO, the "low" compression ratio (10-11) of some of these combos is not suited to 275 deg at 50 cams.

Jim that’s a good point. 👍

I used to use 108LDA rollers in my small block 408 from a 112 SFT and the switch was very noticeable. I also had a 107LDA SFT in my 340 and it ran very strong too. I read a bunch of Harold Brookshires posts over on another site. He was one of the very best cam designers/grinder to ever exist. He was the man behind ultradyne. Bullet now has it and Tim over there is a wealth of knowledge as he worked with Harold back in the day. Just spoke with him about a cam for my combo he said a 108LDA is whats needed in my 3400# car. Said everything from him gets a 108 for a mid to heavy car. Steve over at Lunati worked with Harold too and he is very much in the know as well. Harold had a cam for a 440 in a mid weight car that was on a 106 and as I understand it, was a bad ass. I have a couple rollers picked out at Bullet, both on 108's. One is a 270@50 and the other is a 278@50 and both .726". I'm very serious about the 270. I want to talk with Tim some more about the SFT Ultradyne cam's as i'm not completely sold on the roller yet. Seems a very large investment for maybe 2 or 3 tenths most vs the small investment of the SFT which may be good for a 10th or 2. Is one 10th worth investing $2000+?

I agree 100%. Compression has a bunch to do with it. I just bumped my compression up to 12.5:1 from 11.26 with the same 270@50 SFT cam and the difference is noticeable. I see the difference in my video timer and speedo. 11.26:1 would run 60-112mph in 5 seconds. 12.5:1 runs 55-115 in 5.5 seconds. I drop it to second and shift to 3rd at 6500, when the shift lite comes on again I let off. Not real scientific, but i'm going to the track tomorrow, i'll let ya know for sure. I need to beat my best at 10.40.

I'm following this thread closely. I am not touching anything on my TF240/10.6:1/solid flat tappet/3.54 geared street/strip car just yet, but I will be collecting parts to upgrade the top end after I get my Dart on the road.

I would bump your compression up a bit. I wouldn't worry with 11.25:1 on pump gas. I did it with my 408 and my 511, now at 12.5:1 i'm running 98 octane without any sign of detonation.

I want to try a set!

Dont get sucked in to the 11to1 & up compression on a street car, just asking for trouble, I think I will keep my 9.7 & run whatever pump gas I want. No sense sitting on a knife edge waiting for detonation

No worries. The chamber volume is the same, and I have a really thin Cometic gasket as it is. I think with the 270's and an intake to match and a solid roller I'd be up a significant amount of power. I want to beat on this combo for a bit.

The 270 heads will pick up power over the 240 heads but only if you use the extra air. So either more cubic inches or more RPM. You might need to go with 4.10 gears to use the extra volume of the 270 heads and then you'll have more of a strip car than a street car. Or stroke it and use the extra air feeding more inches.

It's a 512. More gear has been a thought, as well. But changing things is down the road a spell. I'm going to try to enjoy it for a few years.

A 512 with TF240 heads, modest cam and 3.54 gears seems like a great street combo to me. You probably have 600 ft-lbs of torque if you have a decent exhaust and the engine is tuned properly. I wouldn't be in a hurry to mess with that combo. Maybe get it on a chassis dyno sometime and see if you can tweak a little more power out of it. If it was mine I'd put a Sniper EFI kit on there rather than spend the money for 270 heads. With a Sniper you can dial the tune in and you can stay on top of it by watching the data logs.

I posted my dyno session at the end of April. It made 491 at the tire. It's got 1 7/8 ttis and a 3" X-pipe exhaust with Ultra Flows. I'll be adding an AFR gauge when I get the exhaust tweaked how I want it. Efi might be down the road.

Right, I remember that now. It is a really solid combo that you built. The wideband will help with the tuning and EFI down the road would be a significant improvement. The Sniper won't add any power but you'll be able to dial in the tune more precisely.

Haven’t been on moparts in a while. I thought I’d share an update on this thread in case anyone ever googles 270 heads and wants more info. I did share my results on a different post. I bought this short block back from my dad and built it. I ended up with this for the final combo.

511ci. Fwiw it has a 6.7 rod and a 1.12ch piston. Compression came to 11.6 to 1
The Tf heads are out of the box and checked over.
Ported Indy 400-2 intake. 1050/4150 carb
265/269 .660/.652 on 108lsa installed at 105.
1.6 rockers so net lift after lash is around .680ish
TTI 2 to 2 1/8 step headers
Dyno results were 742 horsepower and 699.9 torque.
We used a 950 carb on the dyno which was pulling about 2” vacuum From 5300 up.
2” spacer and 38 timing.
First pull with no spacer and 34 timing it made 723/680.
At 36 timing it made 736hp I forget the torque.
Hope this is helpful. I don’t have 1/4 mile times but I put it in a cuda it’s going to have a 4700 stall 9.5 dynamic converter, it has a strange Dana with 4.10s with mono leafs and cal tracks moved in 1” with 295/65 drag radials.
I’d love to see a 9.99 but I’m thinking it will be in the 10.00-10 teens. I think the race weight is going to come out to around 3650-3700.

Mine is a 451 combo. 270 heads , 1.6 rockers , comp 707 solid roller ,12.6 compression , Indy 400-2 with 2" dominator adapter, 1050 , hooker 2" super comps . Haven't had the engine on a dyno . it did run some new bests last season. 10.14 @132 , 6.42@106 1.37 60' car is a hair over 3500 lbs. I'm guessing it might be 650 - 700hp so I would think a 511 should be able to make a bit more !

Thanks for the updates, nice results! Somehow I overlooked this thread in the past. In reviewing, some of these theories about camshaft choice are wrong and misleading. But what do I know?

Nice, I've done a bit of a weird one here with an offset ground stroke of 3.800" x 4.350" bore for 452 cubes with a 7.1" rod. This is twin torqstorm deal and compression is a true 8.78-1. NA it made 612hp/545tq with a Comp RX296 solid roller. J.Rob

Our street/strip combo is a bit different. We are at 589ci, 4.565x4500, just 10:1CR which is not the way to go for the 365CC -13 heads, a tiny Herbert .625" 260/270@.050 solid roller, a 440-2 with a small older 950HP carb that pulled 2" of vacuum@max rpm and 2.1/8" step TTI's with 4" collector, dyno'd@ 695hp from 5500>5900 and 724ftlbs@4400, different animal to a 505/511 just another way to get 700hp which most wouldn't do but thats how it came all built and ready to go in for a good deal.

So are they TF270's or 365's? I don't understand your post. Either way--something is way off--The torque should be far far better IMO. J.Rob

The heads are 365CNC's which prob only flow the same at our cam lift as 270's would do on a 505/511 with a 650-ish cam for one. The added cubes just makes it a real easy on parts low revving true pump gas 91 motor that puts out 700hp with a restrictive carb in our case. Torque was somewhat low agreed, everything is way off with that combo really but it did ET what we wanted and better in our junk and it was ready to drop in. Its just an example of another way to go for added info really nothing more and perhaps not answering the ops question. I know a few who are running very similar mild combo's like this in the US.