That would be for reference though, not working on a Streetmaster. This is a brand new Edelbrock Performer. I am going to work on it for a friend. We were shocked at how this thing came out of the box. The ports are tiny, *none* are the same size and 3 of them aren't even the right shape.

The intake is going on a new engine he just built for his race car hauler. It's a cherry 69 F350 ramp truck. Posting here instead of the truck forum due to the engine combo. He bought the truck new and it has a 390, T-10 4 speed, headers, 750 vac sec Holley, Duraspark conversion. The engine was rebuilt about 14 years ago and is getting tired again. Rather than have down time since racing season almost never ends here, he has built a replacement engine, then he can freshen the original at leisure.

Russ, you saw the truck last weekend. Used to haul the Roy's Toy Maverick.

New engine is a cool setup: 417 ci FE, 9.5:1 compression. 427 medium riser heads, totally redone, but stock ports. Cam is a Comp Cams 260H .484/.484, 212/212 @ .050, 110 lob sep. Will use the same carb, ignition and exhaust. He is also pulling the T-10 4-speed and putting in a NV 4500 5-speed trans. This is an aftermarket 5 speed, the same one used in the 1 ton Dodge trucks with the Cummins Turbo D. They make an adapter to bolt it up to a Ford bellhousing. Same first 4 gear ratios as the T-10, plus a .73 overdrive.

Now the intake: The gaskets match the heads perfectly, but are much larger than the intake. Plus the previously mentioned problems with the intake. I need to open up the intake ports, but how far? What shape? I don't want to go too big and kill the low end power.

Any and all advice appreciated.

Later,

That cam is WAY too small for even a ramp truck... mine has the Crane HMV272 which is 216 and 228 at .050" and .533" and .563" lift this idles fine and makes good power down low... that little cam will cost lotsa top end power.

The medium riser heads are not a good choice since the valves are spread further apart than on the other heads and the 1.73" exhaust valves are gonna be way too far over the edge of the bore (i assume 417" is a .060" over 410 having a 4.11" bore)
The regular early heads ported with 2.09" and 1.66" valves or a set of Low riser or CobraJets would be a better choice... less expensive too.

Forget porting a regular Performer get the Perf. RPM and don't bother making the ports the whole size of the heads, open them only a bit leave them smaller.

We will take a careful look at the intake. Maybe sawp the one from his current running engine. I'm not sure of the brand, but it is aftermarket aluminum.

On the trans. The NV 4500 used in the GM trucks won't work according to the guys at the company that makes the adapter.

You need the one used in a Dodge. I'm not sure but I think it has something to do with the input shaft.

The 427 heads are nice, he has had them for a long time, just had them re-worked. I'll mention that other heads might work a little better.

No major investment for him though. He has more Ford parts in his shop than anyone I have every seen. At least for someone not in business selling parts. (anybody want to buy an 8500 rpm 331?)

Thanks for the help.

maybe the GM 4500 uses too short an input shaft?

The medium risers are worth more than CJ or low riser heads... they should bring the other heads plus cash.