SLCviaAK

So I have a co worker that has a LY6 6.0 that he is wanting to stroke, probably to a 408" size. I remember a few years back, that the stroker setups would have oil consumption problems and premature wear due to the piston "rocking" at BDC. Is this still an issue? Are there still compromises that are accompanied with using a stroker setup? I was going to contact Thompson Motorsports and pick their brains as well.
Any input is appreciated.

arthursc2

iTrader: (5)

I built that exact combo. A TSP 408ci from an LY6.

I went with Wiseco pistons, TSP rods/crank and 10.2:1. PAC 1219s, some bump stick TSP suggested and an LSA. Its not done yet because projects, but the short block is assembled, awaiting the top end.

As far as I know, 4.00" strokes in a stock block do wear out still.

SLCviaAK

Thanks for the input arthurc2. I'd love to see what your setup ends up putting to the wheels. Should be a fun one.

arthursc2

iTrader: (5)

I am really hopeful for 700. Anything more than that is icing, anything less than that means ported heads lol.

I have a 2.4" upper, 10% OD LSA lower (8.7"), all 8 rib, 80lb injectors, twin pumps (255 and 044) and an ethanol equipped truck. If she needs the E to tame knock, then that just means shes born to make power haha.

But log story short, its a Tahoe with a tight converter that will be used to tow my crawler, race car and buddy's broken ****. I just want her to be fast, comfy an reliable. If she runs a 10.99, that would be cool as hell too

Next engine will be 416 (?) another .03 from where we are, unless I break a hard part. I figure the 408 has 40-50k in her before a refresh is needed. For a limited use truck, that might be 10-12yrs.

Lundy

JE Pistons claims that the 3.900 stroke is less prone to wear and gives up only 10 cubic inches. (3.900x4.030=398 vs. 4.000x4.030=408) This is my plan on my 6.0 with 823 heads. But its gonna be a higher revving alky motor. I'll probably hone it a half thousandth or so tight to help with piston rock on both ends as well. I'm going with the 3.900 because i have a 400 cubic inch limit.

darkirish63

iTrader: (5)

My 1st Stoker motor had Mahle pistols that rocked exsesively which reduced its life greatly. This time arund I went with a Diamond setup with an offset pin that greatly reduced rocking. Motor sounds much tighter and the movement is minimal. My current stroke is a 3.900 as well.

SLCviaAK

This is all good info guys. Ive passed it along to my co-worker. Now its on him to decide what direction to go. Just found out he has a Magnuson 2300 sitting on the bench too. I told him just throw the blower on the existing motor and have fun!

thompson

iTrader: (4)

The stroker will always be less stable than a standard stroke counter part, there is no way around it. There have been huge advances in the pistons them selves as well as the processes that are done to help prevent the rock. The newer box forged pistons that Diamond and Wiseco offer are much more stable now. Also the honing process has come a long way in the last 10-15 years allowing for a much tighter and more true cylinder. The rock is still there, Higher crank case pressure and oil burn is still there just much less than years back and is not near the issue that it once was.

Ken in AZ

Yeah - I'll concur what Thompson said - I have a 4.100" stroke on my LQ4 iron block and oil consumption isn't bad at all.

My Nissan maxima uses a half quart every 2000mi and it's bone stock 100K mi - I think that's excessive.

My truck engine is hard to determine actual oil consumption because I still consider it in the break in phase, but it's not any worse than the maxima and that's with plenty of WOT pulls too.

GREENSIERRA

I don't use much oil in my 408 but I do have to put new pistons in every second season from the piston rock.
I also seen 7400 rpm pretty frequently with mine which I am sure doesn' help at all.
I average around 8000km a season