Hello.

I am having a 470 built for my car, and before it gets put on the dyno I was wondering what you guys think it will make. This is far from an all out build, just a fun street /strip engine designed for pump 93.

470" short block with Ross pistons, Eagle rods and Molnar crank. ( Molnar rods were not available when it was built)

10.5:1 Compression

Trick Flow 270 heads with Harland sharp rockers( 1.5 ratio)

Trick flow intake port matched to the 270 heads.

Holley 950 HP carb

Comp 23-233-4 Cam, solid flat tappet, 252/260 @ .050, .540/.588 lift, 110 LSA ( XS290S grind)

Any guesses?

Good luck, Sounds like a screamer. Wish I knew first hand but I have no idea.

Thanks Rich,

I have no idea what it will make, but I hope it will run well for a fun street/strip b body.

Can you post any pictures and/or info on the port matching? I believe the 270 heads are MaxWedge (1.34 x 2.63/2.65) openings, and the intake is originally std port opening ( about 1.26 x 2.30).

I can ask for pictures. Might be a little bit.

Should make 600 hp. For max power you need a MW intake with the 270 heads, but the standard port intake with work okay with the 270 heads. During the 470 dyno tests that I did my Wilson ported standard intake made more power than the as cast Indy max wedge intake. So a good std intake will work just fine. I think I picked up around 20 hp when I had the Indy max wedge intake ported to work with my 270 heads. But that was a Dominator intake so not really apples to apples.

I made the most power with a 264/268 roller but you should still be able to make 600 hp with that cam. Not sure where the peak will be, maybe 6200 to 6500 rpm. Good luck, should be fun.

550 to 575 at or around 5800 RPM.
Did you degree the cam? If so where is the intake lobe center installed in relation to TDC?
I'm thinking it may make more torque than HP with that compression ratio, maybe not.
All the pump gas motors I've built and dyno that had less than 10.5 to 1 comp. ratio made more torque than HP, above 10.5 to 1 made more HP than torque
Let us know what yours does please

Here is the cam card and the info I have. Hope it helps and I will report back when I know more.

Thanks for the info Andy. I don't have a particular horsepower/E.T. goal in mind but if it gets anywhere near that I will be pleased. I was able to get the Trick flow intake so I went with that. I can look into a low deck Max wedge intake. I would have liked to do a roller cam but had to cut costs where I could. Figured that a solid flat tappet would be a decent compromise.

Nothing wrong with a good solid flat tappet cam. And the TF intake will work just fine at 600+ hp. If you want to push the engine up close to 700 hp then you would need a roller cam and a MW intake.

Trick Flow made close to 700 hp with a pump gas 505 running the 270 heads with a Trick Flow intake and a 950 carb. They used their hyd roller cam for that test. I think they made 680 hp.

If everything is dialed in correct on your engine then it should pull past 600 hp. You just need to double check everything on a new build.

575ish

The TF build:

For a 505 to make almost 700 with the Trick Flow (Howards) HR cam that is on the small side at 243/247 @.050 and ~.600 lift and only a little over 10:1 is pretty impressive.

In a way the smallish cam would help the upper bottom without really Killing much on the top end. It would be interesting to compare the same basic combo with a 240 small port with a slightly say +10-12 bigger cam @.050 to offset the smaller ports.

I know Andy motor did this to an extent but I think the cam was considerably larger.

From a pure streetability perspective it would be interesting to see what the SMALLEST cam duration you could run and still make say 700 hp with the 2 different head combos.

But with your combo if the intake is ported you should still make about 620 I would think. the .450-.500 flow numbers for the 270's should put you there even with a fairly low lift cam...the intake is going to be your limiting factor if the runners cant keep up with the Heads.

The issue with port matching a 906 to a MW isn't really the gasket match, it's making sure the mouth of the plenum to each runner can outflow the head flange enough to feed the head at the torque peak. I used to spend hours working on Street Dominators back before we had much in the way of MW manifolds. Anybody else remember those days?

575-600hp
my 440 with 270 heads (10.75:1) , Victor intake and 1050 4500 , 258/258 .520 nett lift sft went 10.70 in my Satellite @ 3690lb race weight . Eagle crank factory rods SRP pistons .
Wallace shows 595HP

Tex

Not to hijack the thread, how do Indy EZ heads MW ported compare to the TF 270?

I've found that the Trick Flow heads are very picky about the cam profile. I believe it has to do with excellent low lift flow numbers. The heads flow so well at low lift that you have to be careful with the cam size as well as the lobe profile. On my 470 the power dropped off when the cam was both too large, or too small. Once we found a really good cam design then the engine started to respond. I don't know if the cam in this particular engine is going to work well with the TF heads or not. The numbers seem fine to me but I think it is more complex. The single pattern cams that I used in my 470 didn't work very well.

My engine also didn't respond to different rocker arm ratios. It loved ported intakes and it really loved Dominator carbs. My 470 went from 650 hp to 710 by just changing the intake and carb.

From each manf web sites:

That is just the airflow of course. In my experience the Trick Flow heads come out of the box ready to run and they make great power right out of the box. I've never had a pair of Indy heads that were ready to run right out of the box.

Imo, the EZ295 is the direct competition for the TF270.

In true “ootb” form, I would expect the TF to win that shootout.

With the EZ295 valve job redone and blended, on a build with enough cubes to tax the area, and making enough power to really use up the heads (725hp+), my expectation would be that the power would be pretty close.
I think It would make for a great test.

Any idea what the venturi size is on that 950 HP?