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  Porting FE intake? "long"

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Author Topic:   Porting FE intake? "long"
Dave_C
Gearhead

Posts: 432
From: Gadsden, Al
Registered: Aug 99

posted 03-16-2001 07:23 PM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
Does anyone know of any online guide to porting an FE intake? Or have any advice? A while back I saw a web page with instructions on how to port an old Streetmaster 390 intake, but don't remember where it was.

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,

David Cole

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Moneymaker
Administrator

Posts: 11493
From: Lyons, IL, USA
Registered: May 99

posted 03-17-2001 12:26 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I'll get into it tomorrow after I shovel the snow!

------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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TomP
Gearhead

Posts: 3609
From: Delta BC Canada
Registered: Dec 99

posted 03-17-2001 01:35 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
Snow? LOL

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.

I like the NV4500 idea ,i think the ideal one is the GM diesel one with a 4.0 low gear... but good luck finding it, any GM diesel pickup (as if anyone was silly enough to own one ) is a 4x4 or automatic it seems

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Moneymaker
Administrator

Posts: 11493
From: Lyons, IL, USA
Registered: May 99

posted 03-17-2001 02:05 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Well I WAS going to recomend match porting it to the gasket about 1/2 inch into the port side of the manifold so as not to kill the lower end characteristics.

------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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Dave_C
Gearhead

Posts: 432
From: Gadsden, Al
Registered: Aug 99

posted 03-17-2001 02:40 PM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
It is a 410 based engine. He has another cam that he bought for another project, I'll check the specs on that one.

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.

David Cole

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TomP
Gearhead

Posts: 3609
From: Delta BC Canada
Registered: Dec 99

posted 03-18-2001 07:18 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
David

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.

The regular Performer intake is pretty close to a stock iron 390 manifold for runners, it'd be a cork in the system,even the Streetmaster would be better. The RPM or almost any factory alum intake would be a better choice.

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