PSI 8.8L big block

[Jrgunn5150]

All done, the one main I didn't check before is all delaminated lol.

Get a set of new mains and rods and send it.

Got the carb intake on my 5.3 for testing, will put this on the 6.0 and jam that into my K20. If I'm going to get lowballed on Marketplace over an engine I don't care about until I scrap it, may as well be the 350. Will have to swap the cam in the 6.0, it's a bit rowdy for the stock Th400 converter.

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[Jrgunn5150]

Fancy CNC ported heads showed up, can get them from Hank Slocum, can find him on 8.8L PSI Big Block Chevy World Facebook group, flow a little over 330 CFM on the intake and 220 on the exhaust.

Between the cold and screwing around buying Bobcats, be a good month before I'm ready to install them, but excited to have them.

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[Jrgunn5150]

Cam and bearings on the way, tried like hell to find a way out of 550 bucks for a Comp cam, but big block Chevy roller cams haven't made their way to Maxspeedingrods catalog yet lol.

Cam is Comp 11-451-8, XM 284 HR. 284/290 adv, 230/236 @ 0.050, .547/.547, 579/579 with the 1.8 factory rockers, 112 LSA. Should match the intake well, interesting how much like a Sloppy Stage 2 LS cam it is, on an engine with 200 more cubic inches lol.

 

[TotalyHucked]

I definitely can't wait to hear this thing and hear how it performs

 

[legopnuematic]

I too am watching with intrigue. Seems like a good way to get a lot of cubes for a reasonable price.

 

[Jrgunn5150]

I don't think it'll set the world on fire or anything, that intake will keep it from breathing much above 6000 rpm, cam is appropriate for a 540 in that range.

I'm expecting maybe 500 tire, probably 600+ of tq.

Should make for a nice, lazy, tire fryer. As opposed to the violent light switch power I have now.

 

[legopnuematic]

Any updates on the 8.8?

 

[Jrgunn5150]

No, been cleaning garbage for a month, and probably another month to go.

This did remind me to get the main bearings on order. Clearance was under .0018 on two mains so I'll need bearing halfs to get it right.

 

[Jrgunn5150]

Went back to work on this last night. Guy who builds lots of these for truck pulls and boats mentioned he often needs bearing halves to get the clearances where he wants them, sure enough, I had about 0.0015 on the front and nearly 0.003 in the back lol. Not only does it not meet the "rule of thumb" for clearance by bearing size, it doesn't meet PSI's spec either.

Aftermarket vs OE quality, there is no Six Sigma accuracy in the generator engine process lol.

So, as I always caution people, being weird, has a price, and for me, this price was another 80 bucks in undersized bearing halves to get all 5 to 0.0025 - 0.003.

With that bit of tedium done, need to pick up few odds and ends to put together the bottom end, just a rear main seal and some STP lube and I should have a short block.

 

[Jrgunn5150]

Pulled the cam last night, it and the lifters were covered in shrapnel, one bad cam bearing.

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[Jrgunn5150]

Probably could have left these alone, whatever I suppose lol. Number 5 is staying where it is, don't feel like taking this off the stand or messing with a freeze plug over it.

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[91burb2500]

There’s one on eBay right now that they send an offer on for $1900 if anyone is poking around for one.

Watched your videos on YouTube, very interested in this motor. I have 2008 2500 Suburban as well that’s my daily, did you ever figure out if these will run on 58/4x setup to take advantage of factory computer?

 

[Jrgunn5150]

There’s one on eBay right now that they send an offer on for $1900 if anyone is poking around for one.

Watched your videos on YouTube, very interested in this motor. I have 2008 2500 Suburban as well that’s my daily, did you ever figure out if these will run on 58/4x setup to take advantage of factory computer?

I have no interest in using a Gen IV LS anything ever.

I spent 70 bucks and got a 24x crank wheel.

 

[Jrgunn5150]

After pressure washing this thing twice, I continue to find shavings in it.

Taking it to the machine shop for a jet wash.

 

[Jrgunn5150]

Got it back, plan to spend some time picking things up and assembling a shortblock tonight.

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