I HOPE IT SHEDS A LITTLE LIGHT ON THE OIL SYSTEM AND THE LITTLE MODS TO IMPROVE OVER THE STOCK SETUP TO GAIN A LITTLE MORE OIL WERE ITS NEEDED MOST...

Great work mate. An external 3/4 inch oil pick up will aid with volume and cavitation. Bushed lifter bores fix the plastics biggest leak. Plug the pump bypass and run a performance filter. Crankcase evacuation of some sort not just breather and catch can. Windage control is essential. Drill cam bearing bolt to oil pump gear and plug original hole. Oil return, block mods and external drain backs from heads to sump. If running a solid cam block the no 4 cam journal drivers side gallery feed, restrictor only needed for hydraulics. Accumulator outlet should be less then a foot away from pump sandwich plate, it won't get the oil in quick enough to save your engine otherwise.

Excellent vid Griff, thank you very much! I’m building a moderate nitrous 304 currently, have the block stripped and going to do this mod exactly how you demonstrated. Love your enthusiasm for our Aussie V8, keep up the good work!

Excellent work Mr Griff, and thanks for passing the knowledge on to us viewers

thanks for the very detailed explanation. The oiling system on these engines is really their achilles heel. Not sure why Holden would have ever considered leaving the main bearings as such a low priority. I've got a moderately worked 5L, makes 310-320rwhp in my VH SS. It's mainly a street car, but I like to get it out on the track for a few sprint days every year. I take it no higher than 6200RPM, but I usually keep fairly constantly between 4500-6200RPM for most of the lap as that's where the best power range is. Pulled the bearing caps off a few times now with less than 15,000kms on the engine since the last time and the bearings, mains & big ends are shot again. I've done the performance oil pump mod, using your other video as a guide, I also fitted an ASR 6.5L internally gated sump. But bearings just aren't lasting. So engine is out again at the moment about this oiling stuff, I need to get a little more serious. I watched the COME Racing video, but Sam doesn't go too far into depth. Your explanation is really good. I like to know the reasoning behind the mods, and you explain trace the order of oiling circuit so thoroughly, so I now understand why the mods are done. Also I don't think Sam mentioned what size restrictor hole to drill into the #4 camshaft tunnel, but you mentioned 2mm, so that was good to know. Only thing I would like to see or find out a little more is what sort of drill you used to drill the hole in #1. I can't imagine getting a drill in there. Maybe you used a 90deg drill and I assume the hole would end up on a big of angle as you wouldn't get the drill in there straight. Still not real confident taking to an engine block with a drill and dremel, but this video certainly boosts my confidence a little.

Good stuff Griff, I've done the same as you along with radiusing the oil pump holes and a oil feed line from the front mains gallery into no4 cam journal so mine doesn't starve at 7500! Keep up the good work mate!👍

Good job Griff, a good explanation mate.

Great video mate. I already knew alot of this, but that direct feed to mains #1 makes ALOT of sense why you move the lifter gallery to the front crossover. Thank you. P. S maybe weld an extension to your drill bit so you can drill deeper.

Excellent explanation bud, very well put !! It would be good if somehow you could streamline the oil pickup and strainer that's probably the wrong words or create more positive flow maybe a better way to put it !! Mainly to take advantage of all the hard work you've put into the block !! Great job mate. Seeya Rob........keep warm guys !

I can dig it!

Great video Griff, heaps of very usefull information. It will be good to see the benefits of all your work when its running. Did you do the same amount of oil mods on the current 308 in your car?

Great lesson mate. All info is bang on. Are you thinking of externally feeding the pump.

Yes use 8x1.25 the no 4 cam

Hi Griff, great video. What will be interesting with the oil extra flow you are creating by enlarging the diameter of the block oil galleries if the standard pump will still be capable to continually suppling the extra flow required????? Or is it time to go for the larger high volume pump???? I don't know way either but thought I'd ask the question....

Hi Griffs, thanks for your info videos. With the 1st cam bearing seat, do you drill the hole through to the feed oil gallery 1st or do you cut the annulas 1st?

Hi there mate, great info. Thanks for sharing. Just wondering if you made a typo on the 3/8 BSP plugs? I have gone down this road before and remember using the black Allen key plugs and from memory were a 3/8 NPT. Or did you use totally different plugs. Cheers mate well done.

I think if you're running a hydraulic cam the restriction is a good idea but I'm blocking mine off completely being a solid cam.

G day griff have you ever put in a oil shaft bush and roll pin need a some video on that dro

Hi mate, great videos. Hey I have a situation. I believe my engine has been put together with only the new channel in #1 cam bearing location but no restrictor in #4. Do you think engine will need to be pulled back down ?

How do you stop the restrictor plug and the plugs replacing the welsh plugs from coming loose? loctite ?

does anyone know where you can buy the M8 x 1.25 tapered plugs ? I've searched everywhere online can only find the finer thread M8 x 1.0 thread in the tapered plugs which I suspect is too fine for cast iron. I can find M8 x 1.25 grub screws, but they aren't tapered, which I'd prefer to avoid as it has the potential to drop into the oil gallery if it did happen to break lose. I would loctite it, but still.... peace of mind

so what pump are you planning on using .. standard or hi volume?

can these Mods help the 253 as well??? I know there are plenty out there that bag the little 253!, but i reckon it"s a Great motor and it runs far cooler

Hi Griffo, I'm thinking, with the 5/8" drilling of the primary oil gallery after the pump, maybe only drill to just past the oil feed to No. 1 main bearing? Saves buying a longer drill bit and flow will be reduced a little after the oil take off for No. 1 main.

Hi Great video, do you have any tips for my 304 rebuild that has no oil pressure ?

Could you please give us some information on actually drilling the hole for the No 1 cam bush mod and how you did it

Hi Griff, I have just completed all the drilling and tapping for the mods. Just got to create the annulus in cam bearing 1. Oh and used the m8x1.25 in bearing 4. Question for you; did you a taper plugs everywhere? and what loctite did you use to ensure they don’t come out? Thanks mate!, Anthony