Search found 2041 matches
- 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...
- 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.
The OP starting with a virgin block is the right idea for a decent build.
- 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.
A steel piston sounds interesting and bulletproof too.
- 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.
- 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 ...
- 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...
- 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...
- 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...
- 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.
Seriously, gap the top ring correctly and don’t detonate the engine and they’ll last longer than you have interest in the engine.
- Sun Apr 03, 2022 12:18 am
- Forum: Engine Tech
- Topic: My Machine Shop Warns Me Against Using Solid Lifter Cams and GM Cast Cranks Today...
- Replies: 34
- Views: 3684
Re: My Machine Shop Warns Me Against Using Solid Lifter Cams and GM Cast Cranks Today...
Cheap lifters and camshafts will bite you.
- 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...
- 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 ...
- 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...
- 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...
- 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 ...