Search found 2041 matches

by rustbucket79
Wed Apr 27, 2022 11:57 pm
Forum: Engine Tech
Topic: ICON 9929 Piston Specs
Replies: 55
Views: 4226

Re: ICON 9929 Piston Specs

Wiseco Pro Tru Street PTS503A4 looks like a 1.560” CH. perhaps your local machine shop is a dealer and can get you a good price on a set.They come with rings. We have a winner! They just arrived today and will be delivered to the shop tomorrow. Nice looking parts plus decals! Took about 2 months fr...
by rustbucket79
Mon Apr 11, 2022 10:27 pm
Forum: Engine Tech
Topic: Barrel shape in #1 cylinder (sbc)
Replies: 14
Views: 1516

Re: Barrel shape in #1 cylinder (sbc)

The 400 blocks I’ve sonic tested are quite thick for a factory block on the major and minor thrust sides however they are sculpted every place there’s a head bolt hole, so invariably those areas are the thin spots.

The OP starting with a virgin block is the right idea for a decent build.
by rustbucket79
Mon Apr 11, 2022 10:16 pm
Forum: Engine Tech
Topic: A little OT, but where to get custom steel diesel pistons?
Replies: 11
Views: 1566

Re: A little OT, but where to get custom steel diesel pistons?

The little I’ve researched On Duramax pistons the issue with forged aluminum pistons and longevity have to due with the top ring land not being steel/cast.

A steel piston sounds interesting and bulletproof too. =D>
by rustbucket79
Mon Apr 11, 2022 10:03 pm
Forum: Engine Tech
Topic: Best 781 valve size for .060 bore max
Replies: 26
Views: 3350

Re: Best 781 valve size for .060 bore max

I’ve personally witnessed one of these heads after being cut for 2.25 intake valve and bowl hogged with minor blending crack after limited use in that bowl area. I would tread lightly since these heads were never produced with the larger valve sizes.
by rustbucket79
Sat Apr 09, 2022 2:18 pm
Forum: Engine Tech
Topic: Edelbrock carb tuning
Replies: 131
Views: 11931

Re: Edelbrock carb tuning

Shadango Do a compression test and put a vacuum gauge to see the idle vacuum. This is the most important step. I’ve dealt with a few ill conceived engines on the dyno, here’s what you need to do. If you have less than 150 # cranking and 7” vacuum (arbitrary numbers) you can make it idle better with ...
by rustbucket79
Wed Apr 06, 2022 11:09 pm
Forum: Engine Tech
Topic: KB hypereutectic pistons
Replies: 41
Views: 4155

Re: KB hypereutectic pistons

Not necessarily KB specific but in last couple of iron headed SBCs I've built with Speed Pro hypereutectics, I went through tuning phases with plenty of heavy spark knock as well as light rattling when in lean cruise and super advanced. I can report that the pistons held up well with no damage to t...
by rustbucket79
Wed Apr 06, 2022 11:02 pm
Forum: Engine Tech
Topic: Barrel shape in #1 cylinder (sbc)
Replies: 14
Views: 1516

Re: Barrel shape in #1 cylinder (sbc)

Either close your eyes and run it, or toss the block. Yes some 400 blocks have been successfully sleeved over the years but my feeling is you have a high probability of cracking a head bolt hole due to the extremely thin casting remaining around the head bolts. There is no ring that fixes oddly shap...
by rustbucket79
Sun Apr 03, 2022 11:30 pm
Forum: Engine Tech
Topic: KB hypereutectic pistons
Replies: 41
Views: 4155

Re: KB hypereutectic pistons

Wonder why all the fuss over hypers, darn near ever GM car and truck has had them since the late 90's. Sure don't hear anything about them other than the piston slap complaints on the LS hyper ones. My 5.3 has hypers and 250K noisy for the 1st 30 sec. after that the engine runs perfect. I say run'e...
by rustbucket79
Sun Apr 03, 2022 4:45 pm
Forum: Engine Tech
Topic: KB hypereutectic pistons
Replies: 41
Views: 4155

Re: KB hypereutectic pistons

How do you find KB’s? Normally in the oil pan.

Seriously, gap the top ring correctly and don’t detonate the engine and they’ll last longer than you have interest in the engine.
by rustbucket79
Sun Apr 03, 2022 12:11 am
Forum: Engine Tech
Topic: Terminator X Stealth on the Dyno
Replies: 5
Views: 878

Re: Terminator X Stealth on the Dyno

Bring a laptop with the Holley software installed. All good advice, when I tune on on our dyno the most important thing is the O2 sensor. Exhaust leaks and/or insufficient tailpipe length after the sensor will falsely influence the sensor and subsequently the tune. The system is extremely quick to l...
by rustbucket79
Sun Mar 27, 2022 11:09 pm
Forum: Engine Tech
Topic: 383 SBC Build Plans and Suggestions for 4x4 Chevrolet
Replies: 62
Views: 4362

Re: 383 SBC Build Plans and Suggestions for 4x4 Chevrolet

Get the Sniper EFI and buy their Hyperspark ignition too. Your heavy vehicle combined with big tires and overdrive will likely need a custom timing map to avoid detonation in high load situations, and the Sniper software allows you to create it. It also allows a custom fuel map which will help with ...
by rustbucket79
Sun Feb 13, 2022 10:44 pm
Forum: Engine Tech
Topic: Help with 406 sbc build
Replies: 23
Views: 3075

Re: Help with 406 sbc build

I’d use the aluminum heads because they’re a bit less prone to detonation, don’t worry about the runner size, on a 400 they’ll be fine. Those KB pistons don’t deal with detonation at all, and most people don’t provide nearly enough top ring gap. The FM hypereutectic pistons at least have some lid ab...
by rustbucket79
Wed Feb 09, 2022 10:34 pm
Forum: Engine Tech
Topic: Mods for solid flat tappet
Replies: 33
Views: 3917

Re: Mods for solid flat tappet

BBC are always going to wear out cams & lifters [ even good ones ] more quickly because [a] the 1.7 rocker ratio & the large valves. Large valves require stronger springs for control & high[er] rocker ratios put extra load on the lifter/lobe interface. Problem was NEVER the oil. Oil com...
by rustbucket79
Wed Feb 09, 2022 10:08 pm
Forum: Engine Tech
Topic: Piston design feature for long stroke?
Replies: 9
Views: 1780

Re: Piston design feature for long stroke?

I recall many many years ago the first 548 (385 series) Ford I built. 4.400 x 4.500 with 6.700 rods. IIRC there is about 3/16” of cylinder wall below the wrist pin, and a fair amount of skirt protrudes at BDC. At room temperature with the piston at BDC you can rock the lid of the piston an alarming ...