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Iron D-Port Heads All iron d-port heads, flow number and performance results

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Old 11-04-18, 11:13AM   #61
Mb125
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Got my heads back from paul. Just needed new valve springs, the valve guides and valve job still were good.
This engine gets shifted at 6500-7000 RPM
Solid flat tappet camshaft
Thanks to paul carter and Jeff koerner for all the top quality work.
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Old 11-04-18, 04:02PM   #62
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Paulís one of the best, but I donít have to tell you that. They look good !
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Old 07-08-19, 04:05PM   #63
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Here is my D-port combo that runs best so far of 10.59@126.27 NA on 275/60R-15 MT DOT Drag Radials.

I don't own a trailer and live close to a track, so it is driven to the track.

Car weight is 3305 without me in it.

Running a 3.73 rear gear in a Dana 60 with spool.

I built this engine in the 1980s and am currently running it until I get a new 474 w/hi-port motor in the car.... hopefully before the end of the year.

I'll start with the top of the engine and go down.

Carburetion is 2 Holley 660 center squirter carbs on top of a ported 1st design Wenzler T-Ram.

Cylinder heads are 48 castings that cc'd at 66 cc on the chambers. Exhaust crossovers have been filled with aluminum and intakes porting is extensive. Have never had them flowed but intake port volume is 175cc. Using stock length TRW valves with spring seats cut to attain 1.785 installed height.

Short Block is a 4 bolt 455 block with OEM 455 crankshaft and 455 SD rods swinging 530 gram Ross Flat tops with SD 455 style single trough 4cc valve reliefs. Pistons were sold by HO Racing in the 80s as Ross 455 SD replacements as HO P/N FP-92. Wrist pins are tapered 4340 chrome-moly from HO Racing (HO P/N FP-02)...running full float stock pin dia..rods are not bushed (to thin on the small end for bushings) Pistons were cut for additional valve clearance.

Valve train starts with a Lunati P/N 40712 Solid lifter Camshaft Specifications:
Grind# SPC2-317 Serial# IBGC 5866
Int. Exh.
Lift at valve .637 660
Duration @ .050 275 289
Advertised duration 312 322
Lobe separation 106
Int. lobe centerline 104

Running Crane 1.65 aluminum roller rockers topped off with a Webster Stud Girdle hiding under M/T valve covers (required 1" spacer) as I'm going for a retro look. in regards to the retro look I also changed the sideways mounting of the carbs to inline using Edelbrock's 1/2 inch adapter spacers designed just for the purpose of turning the carbs sideways. Besides looking old-school, inline mounted carbs make the linkage solution so much easier.

Suspension details are moroso trick springs up front dampened by Calvert 90/10s and Calvert split-mono leafs and cal-tracs with Calver single adjustable rear shocks.

Fuel system is still the original stock 3/8 steel line from the firewall all the way back to the tank .. with a holley blue pump mounted near the tank. the fuel system needs serious upgrade and will be the first thing addressed for the new 474 hi-port motor.

The engine does spec out to about 12.3:1 compression and thus I race with Race gas...but do drive around on the street with pump gas and octane booster. Need to convert to E85.
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Old 07-08-19, 04:45PM   #64
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that is a nice combo
any pics of the car?
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Old 07-08-19, 04:58PM   #65
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that is a nice combo
any pics of the car?
Thanks MB . .here are some of it at the track from the last 2 outings ...one was 2 weeks ago
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Old 07-08-19, 07:07PM   #66
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Nice ! Good numbers for D-Port heads.
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Old 07-08-19, 07:44PM   #67
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Got tell that is the most detailed description Iíve seen in a long time. Which helps tremendously in getting advice.
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Old 07-08-19, 08:19PM   #68
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Got tell that is the most detailed description I’ve seen in a long time. Which helps tremendously in getting advice.
LOL ...I read too many Hot Rod magazines when I was a kid .. that's where the "rods swinging xxx type pistons" kinda lingo comes from.

Oh oh ...I'm slipping ...forgot to add ring type ...Gappless-ProSet Total-Seal 3455 035

Forgot transmission is TH400 with hipster brake .. .converter is a local built 10" stalling 4200 on the brake
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Old 07-08-19, 09:03PM   #69
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You looking to get into 9ís with new motor ?
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Old 07-08-19, 09:39PM   #70
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You looking to get into 9’s with new motor ?
Yes ...hoping so.

The main issue gonna be the heads are better suited for a 535 being they have 2.25 intake valves and I will be running a 455 block with a 4.211 bore.

I was told there would be no interference but shrouding will hurt my flow. And that is one of the things I wanted to toss around in the hi-port section.
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Old 07-08-19, 09:50PM   #71
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You looking to get into 9ís with new motor ?
I'm pretty sure 9's are possible with what he got in the car now.
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Old 07-08-19, 10:23PM   #72
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I'm pretty sure 9's are possible with what he got in the car now.
Just dont know where that much more HP gonna come from with current iron d-port engine...big roller might get me a tenth or 2...but not gonna spend the money to get the valves and springs I would need for a roller on my iron d-ports.

A major diet would help too...but I dont see that happening
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Old 07-08-19, 11:25PM   #73
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At that weight heís going need to make 750 hp. To run 9.80 Iím guessing heís around 625 hp now.

I think Heís already dish out money for High Ports that flow 380+ CFM.
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Old 07-09-19, 04:17PM   #74
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Only thing I be very careful on is the new build block with 4.211 bore. I would have that block sonic tested ( if you havenít already) they tend to have thin walls.
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Old 07-09-19, 07:52PM   #75
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Originally Posted by AngryBird68 View Post
Just dont know where that much more HP gonna come from with current iron d-port engine...big roller might get me a tenth or 2...but not gonna spend the money to get the valves and springs I would need for a roller on my iron d-ports.

A major diet would help too...but I dont see that happening
so are you going to sell those 48's when you put the new heads on ?
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