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I’m working on a 400 using 6.76 rods and ICON 440 stroker pistons.

Mill it. Going.020 is nothing in the grand scheme of things. You can order head gaskets in whatever thickness you need if your compression is already where you want it.

yeah, I didn’t do the math, just saw the .060 and went from there...

It would technically be .120 over. The terms are in reference to bore diameter, not radius so .030 over is .015 removed from each side, .060 over is .030 removed from each side, not that circles have sides but that’s common terminology.

It’s an LS. Bolt the head back on and run it.

I’ve run a similar cam in a 572 hemi. Yours should be a good match to the gear and compression. As DVW says, it’s ramp rate that can be an issue. If the ramp rate is slow enough, you won’t need a ton of spring pressure and it won’t kill a needle bearing roller lifter. I ran Comp 892-16 lifters...

It’ll be way less expensive to do with a ratty old 440 and a turbo than doing it with a 500” NA stroker. Either way is easy and the recipes are out there. I’m at 1200rwhp and I can tell you there’s always someone with way more going way faster lol

Curious to know your thoughts prompting the oil change and the data comparison from afterwards.

The Mega blocks were all nice blocks. Wished I would’ve bought a half dozen more back in the day.

I have noticed variations in hardness but nothing that followed a specific year or casting number pattern and the factory blocks were all noticeably softer than the aftermarket blocks. My hone was an HP6A Diamond hone so it didn’t really care how hard the blocks were. The ductile iron sleeves I...

This X 2. Same goes for the cold weather 400 block nonsense. I’ve sonic checks those with results from excellent (.200+) to totally useless and tons of core shift.

This pretty much sums it up. The 9” needs aftermarket housings and pinion support to handle the same power a stock Dana will take. If you build an aftermarket 9” housing with heavy wall axle tubes and back brace it, the weight difference isn’t as drastic. I’m pushing 1200+ whp through a stock...

I currently run a factory 68 Dana 60 with a stock 3.73 sure grip. It’s got Moser 23 spline axles going 1.32 60’ in a 3950# car. The sure grip was rebuilt in 2005 and is probably needing it again. I scored a Ford truck Dana with a 4.10 trac-lock for $150. I cut ends off an 8-3/4 housing I had and...

I ran 12:1 on 93 octane for a decade on various drag weeks. Cam was 276/[email protected]. I sprayed it with a splash of 110 octane on top of that. Current 9.5:1 combo did Midwest Drags on 87 octane adding VP C16 once I arrived at each track.

Excellent info. I’ve only seen the adapter plate kits. I’m assuming the JW bell used is the BB to 727 version?

I’m currently running a built 727 and I’ve replaced everything with aftermarket internals to support the power level I’m at now (1200whp) and I’d do the same for the OD version. I’m looking to know if that aftermarket support is there for these units and what power levels they’re successfully...

Are there any good sources for education on these transmissions and their differences? I’d like to use a fully electronic version in a high horsepower street/strip application and control it with the transmission ICF on the EFI system.

It’s not overlap causing that, it’s intake closing point. Drop it back to a 110 degrees intake centerline and check the cranking cylinder pressure again. That cam is definitely on the small side for a 500”.

The Edelbrock cam you mentioned seems to be a go to for the 500” combos for drivability and everyone offers a version of it. I agree with NX that it would idle smoother on a 114 or even 116 lsa. EFI will give you the ability to tune it to run nice regardless.

Agreed. Especially if the block has a large chamfer as most factory blocks did.