Dan Jones Dan Jones St. Louis, Missouri (280 posts) Registered: 07/21/2008 03:32PM Main British Car: 1980 Triumph TR8 3.5L Rover V8 |
No LBC Content (but some little Italian car content)
I was out of town on business but Dave McLain has the 403C for my white Pantera
on the dyno. The block is the 4 bolt main block out of my red Pantera. While it had seen only 25K miles, it needed a slight clean up due to some surface rust so we decided to go to a 4.005" bore using off-the-shelf Diamond 351C stroker pistons. The parts list looks like: Ford 351C block 4 bolt main block, 0.005" over (4.005" bore), not zero-decked Diamond forged Cleveland stroker pistons (4.005" bore for 4" stroke and 6" rods, 14.5 cc's dished, plasma moly rings) 403 cubic inch displacement (4.005" bore by 4" stroke) SCAT 4340 steel forged 4" stroke SVO (Windsor design with Cleveland mains, requires snout spacer) crankshaft SCAT 4340 forged steel I-Beam rods (6" long with 7/16" ARP bolts) Romac 351C SFI spec harmonic damper, zero balance Clevite H-Series rod bearings (for SBC dimension rods) Stroker kit internally balanced Schiefer neutral balance aluminum flywheel Crane link bar retrofit hydraulic roller lifters (p/n 36532-16) Mallory Unilite vacuum advance distributor (small cap for Pantera firewall and rear window clearance) Crane steel distributor gear (p/n 52971-1 for 351C with 0.531" shaft dia.) Pioneer brass freeze plug set (p/n 830005) J.P. Performance double roller timing chain (German Iwis chain) Ford Motorsport M-6005-A351 heavy duty chrome moly oil pump driveshaft Blueprinted Melling M84A standard volume oil pump Ultra Pro Machining hydraulic roller oil Armondo Pantera gated and baffled road race oil pan Ford Motorsport high port head gaskets for 351C block Edelbrock aluminum 351C water pump (p/n 8844) Trend custom length 0.080" wall push rods (for the taller roller lifters) Fuel pump block off plate (dyno providing the fuel flow) Bullet custom hydraulic roller cam (see specs below) Competition Cams beehive springs (p/n 26095, 150 lbs @ 2", 375 lbs @ 1.25") QFT SS-830 carb (claimed flow 900 CFM @ 1.5" Hg) MagnaFlow single 2.5" inlet, dual 2.5" outlet mufflers, polished stainless steel (p/n 14218, 5" thick, 8" wide, 14" case length, 20" overall) ARP head bolt kit (with hardened washers) Crane gold race aluminum 1.73:1 351C 7/16" stud mount roller rockers I had some of the parts in my stash and Brent Lykins supplied the internally balanced stroker kit while Alex Denysenko supplied the rest of the bits. This engine will initially go into my white 1974 DeTomaso Pantera L but will likely end up in my 1956 F100 project truck (whenever I get around to it). The white Pantera is strictly a street car and is a nice weather daily driver. The goal is similar to the 408C we did for Mike Drew's Pantera (peak around 6000 RPM with excellent street manners and reasonable fuel economy). Mike's engine made 526 HP and 500 ft-lbs through the dyno mufflers and he reports 18 MPG tearing through the mountains at 80+ MPH so we think it could do 20 MPG during a level terrain cruise). Anyway, that's the benchmark to beat. I designed the hydraulic roller cam using Dynomation and crossed it against the Bullet lobe catalog. Specs are: 293/298 degrees duration @ 0.050" lift 238/242 degrees advertised duration 0.640"/0.574" lift (with 1.73:1 rocker ratio) 110 lobe separation angle Bullet CRA type intake lobe HR293/370 Bullet CRS type exhaust lobe HR298/332 Type CRA which means a grind with a conventional nose (as opposed to a nose designed for a lift-rule race class), a lobe shape good for RPM and/or high lift rockers (applies to 351C's 1.73:1 rocker ratio) and asymmetrical opening/closing (helps with valve bounce). CRS is the same but with a symmetric lobe. The flow numbers used for the cam design were gathered without a pipe extension which biases the design for more exhaust duration than if they were flowed with a pipe (adds approximately 30 CFM). If I had it to do over, I'd probably shorten the exhaust duration a bit. We have several sets of Ford Motorsport A3/C3/C302/C302B high port aluminum Cleveland heads available for testing, along with with matching intake manifolds and exhaust headers. Some of the heads have stock chambers (Cleveland quench chambers) while others have been clearanced for domed pistons so the compression ratio will vary but should be in the 10:1 range. We won't test them all but here is the head line up that we have to choose from: 1. large port A3 (unported but smoothed, early exhaust bolt pattern) 2. large port A3 (some port work but not flow tested, late exhaust pattern) 3. E2ZM-6090-A3 Phase 1 1/2 (2.19/1.71, narrow C302 intake port, larger A3 oval exhaust, D shaped chambers, dated 11/15/83D and 11/14/83N) 4. E3ZM-6049-C3 (unported but smoothed, oval exhaust port) 5. E3ZM-6049-C302B (ported but small port, late flange, common height bosses, ex-Alan Kulwicki, still need to flow bench test) 6. E3ZM-6049-C3 (2.15/1.65, ported, unshrouded, intermediate intake port, D-shape exhaust port, short boss, late exhaust flange, currently has Windsor coolant routing, dated 4/23/86N) 7. E3ZM-6049-C302B ported (larger intake ports, rectangular exhaust ports, late flange, common height bosses) 8. E3ZM-6049-C302B ported tulip head exhaust valves, best flowing of all the heads, on Fontana short block but not torqued down For the large port A3 heads, the intakes available for testing include: 1. A331 Edelbrock low rise single plane (A3 port version of the Torker) 2. A331 Edelbrock low rise single plane (modified with plenum extensions) 3. Scott Cook low rise dual plane (looks like Ford Boss 351 intake, CHI 3V port) 4. CHI 3V single plane tall single plane (4150 flange version) We can also run the smaller port C302B intakes on the A3 heads. For the smaller port C3/C302/C302B ports, the intakes available for testing include: 1. Roush A331 unported 2. Roush B351 unported 3. Roush B351 ported (ex-Alan Kulwicki) 4. Edelbrock D351 unported Headers available include: 1. Precision Proformance 4-into-1 shorties for 9.2" deck block with high port heads in Pantera chassis, slotted to fit both early and late high port flange patterns, fits either A3 or C3/C302/C302B heads (2" OD, 1 7/8" ID primaries with lengths that vary from 12" to 20" long, collector ID is 2.39" and length is 6") 2. 180 degree Pantera headers for 9.2" deck block with C3/C302/C302B heads, Mad Dog's old headers 3. Stainless steel full length tri-y's for small port late model flange only, 1 3/4" OD first pair, 2" OD second pair with 2.5" diameter collectors 4. Circle track high port headers, upper bolt holes elongated to fit both early and late bolt patterns, stepped tubes with bolt-on 3 1/2" collectors, 3 1/2" diameter extensions Mufflers are 2.5" single inlet/dual outlet Magnaflow mufflers and all dyno runs will be through mufflers unless otherwise noted. I went with internal balancing as I already had a neutral balance aluminum flywheel (a NOS Scheifer unit I got cheap because it was Ford 300 truck inline six part). Since we were internally balancing, we chose SCAT's I-Beam rods over the heavier H-beam rods as the light rods require less Mallory metal in the bob-weights. Diamond had an off-the-shelf piston for the combo to round out the stroker kit. The oil is a special blend for hydraulic rollers that reduces the leakage rate and meant to be used with pre-load set to zero lash. Out-of-the-box, the carburetor was really rich with poor idle and part throttle but ran fine at wide open throttle. The QFT SS series carbs have replaceable idle feed restrictions so Dave reduced them to cure the problem. Ford Motorsport used to offer the M-6065-A351 head bolt kit (1/2" diameter bolts that are 1" longer than production 351C bolts, with hardened washers) for installing SVO high port aluminum heads on 351C iron blocks but they are no longer available. I ordered what was supposed to ARP's equivalent kit but only half of its bolts were the correct length so Dave sourced replacements for the other bolts. I've since found an M-6065-A351 bolt kit. Also obsolete is the FRPP snout spacer part number M-19009-A341C which is required with 351 SVO crankshafts used in iron 351C blocks. Dave had one he measured: 0.400" thick 1.830" OD 1.360" ID 45 degree chamfer about 0.125" wide on one end of the ID and makes spares as he needs. They only need to be a slip fit. After he made mine, I found several spares at a local machine shop. The first set of heads tested are the unported but cleaned up A3's which were mated to the Pantera shorty headers and an A331 intake manifold. Dave did some work on the plenum and added runner extensions to the intake to try to get it to tune to a lower rpm which appears to have worked. Dave's dyno is known to be 4% to 5% conservative compared to the calibrated Engine Masters dyno (verified on Dave's 351C and 460 based EMC entries). Adjusting for that, the A3 and A331 top end made 560 HP @ 6300 RPM and 512 lbs-ft @ 4900 RPM through the 2 1/2" single inlet/dual outlet Magnaflow mufflers. HP hung in until 6500 RPM and then started to drop off and it liked approximately 36 degrees total timing and a 1 inch open spacer under the carburetor. Dave said he's going to mess with the jetting a bit more and then switch to the Cook dual plane intake manifold. Removing the mufflers was worth about 10 lbs-ft and 5 horsepower so not too bad but could probably benefit from a cross-over. A promising start, given that Dynomation predicts the smaller ported heads to be better by 20 to 35 HP. Info on the first set of heads tested: A3 Ford Motorsport High Port Heads minor clean up, 2.19 intake, 1.71" exhaust, 2.74 square inches minimum intake port area, 1.88 square inches minimum exhaust port area, intake port 2.125" H by 1.725" wide (3.665 square inches), exhaust port 1.65" H by 1.725" wide (2.27 square inches), tested on Dave McLain's SuperFlow flow bench at 10" and converted to 28". Clayed intake radius but no exhaust pipe. As with most of the Cleveland heads we've tested, they generate little to no swirl motion. Lift Int Exh Inches CFM CFM 0.025 15.7 11.7 0.050 34.6 28.1 0.100 65.5 56.7 0.150 95.2 87.5 0.200 129.2 109.8 0.300 188.8 142.4 0.400 242.8 167.0 0.500 287.7 186.7 0.600 321.4 204.4 0.700 337.7 216.3 Note: Dave's bench tends to be conservative compared to others I've tested the same heads on (by 20 CFM or so) on but gives good results in Dynomation. These numbers are very similar to what CHI-3V and CHI-4V heads produced on Dave's bench. Some parts pictures: The top end parts and Pantera headers we're currently testing: Pantera oil pan: and a couple of the block wire wheel stripped to bare metal: Dan Jones |
Dan Jones Dan Jones St. Louis, Missouri (280 posts) Registered: 07/21/2008 03:32PM Main British Car: 1980 Triumph TR8 3.5L Rover V8 |
Re: No LBC Content (but some little Italian car content)
Last night Dave tested the Scott Cook dual plane intake. Scott's intake
manifold looks much like a Ford cast iron DOAE-9424-L dual plane but is cast in aluminum, slightly taller (around 10 mm or a bit more than 3/8") with smaller ports that are sized more like a CHI 3V. Luckily the intake was also designed to fit a 4V iron heads (port stuffed or not) so also fits the A3 high port heads. Like the over-the-counter version of the Boss 351 intake, it has two oval holes in the carb flange instead of the four circular holes of the iron Ford intake. The one tested is one of Scott's first generation intakes which he has since redesigned to work better on larger displacement engines with good flowing heads. Given that it's the earlier design, both Dave and I thought it might be out of its element on my 403C but it surprised us. The dyno fuel log wouldn't clear without a spacer so it was run with a couple of different 1" spacers, making the best HP with HVH 4 hole spacer registering 569 HP @ 6350 RPM and 511 ft-lbs @ 4750 RPM. Switching to a 1" open spacer, increased peak torque to 514 ft-lbs @ 4700 RPM but HP wasn't quite as good. Pop the mufflers off (or use the larger 3" inlet/outlet Magnaflows) and it might make 575 HP with a street hydraulic roller. Not too shabby. Paint the A3 heads and Cook intake Ford blue and no one would know it's not a stocker. In fact, that set up would fit under the hood of my 1966 Mustang fastback but would require notching the shock towers for high port header clearance. The 225/60/15 tires would not be happy :-). One of these would wicked in an 1970's Capri. I know a guy who makes the motor mount kit to install one (351C shares the SBF mounts and bellhousing). Intakes to follow include a Roush B351 and CHI 3V single planes. On an earlier test on the 351C dyno mule with CHI-3V heads, the very tall CHI intake picked up 20 HP over the low profile Cook dual plane. Will the trend continue? Dan Jones |