Search found 920 matches
- Mon Dec 07, 2020 10:57 pm
- Forum: Vintage/Classic/Historical Engine Tech
- Topic: Shelby/DeTomaso P70 7Liter (Windsor base block race eng)
- Replies: 6
- Views: 4818
Re: Shelby/DeTomaso P70 7Liter (Windsor base block race eng)
I saw an article about one of Lothar Motzenbacher's (?) cars, that was supposed to have a four-bolt 351 Windsor block. I didn't remember seeing anything about that anywhere else. I wonder if it was one of those... the author of the article wasn't an engine guy.
- Fri May 15, 2020 6:02 pm
- Forum: Engine Tech
- Topic: Piston oil squirters in NASCAR engines
- Replies: 71
- Views: 12369
Re: Piston oil squirters in NASCAR engines
Older small block Chevys that had the little slot across and around one rod bolt (commonly known as the "spit hole") for oil to pass through. Various service manuals said they were for providing additional oil to the camshaft.
- Mon May 11, 2020 1:58 pm
- Forum: Engine Tech
- Topic: SBC block leaking water internally...
- Replies: 11
- Views: 1514
Re: SBC block leaking water internally...
For a production Chevy small block, the only place I've personally seen with an internal water leak was a crack down in the lifter valley, usually in the middle unsupported area of the water jacket. Has the block you're looking at been clearanced for a stroker crank? Some water jackets go lower than...
- Sat Apr 25, 2020 9:15 pm
- Forum: Engine Tech
- Topic: +.004" o.d. Chevy rod brgs?
- Replies: 4
- Views: 940
Re: +.004" o.d. Chevy rod brgs?
Older Mopar V8s which might have one or more oversize lifter bores. Neither the dealer nor the local parts stores could get replacements. Probably no big thing after the internet. Oversize valve stems on small block Chevys, usually small-valve truck heads. Easy to get and in stock everywhere, they w...
- Sat Apr 25, 2020 9:03 pm
- Forum: Engine Tech
- Topic: Remember the Ford 510" budget builds?
- Replies: 13
- Views: 2051
Re: Remember the Ford 510" budget builds?
Historically, one of the earliest popular stroker deals was Drew Backlund's 540, which was made by using the Ford 240-6 cylinder rod and an OEM crank stroked to 4.22". I did some 460 strokers with 240 rods; apparently more than one machine or setup was used for doing the oil holes in the crank...
- Sat Apr 25, 2020 8:51 pm
- Forum: Engine Tech
- Topic: Chatter marks on main bearings
- Replies: 11
- Views: 1706
Re: Chatter marks on main bearings
That's a ground finish. The OEMs like to use something like a 10 grit wheel and feed it hard; that's where the tears come from. Depending on which factory they came from, small block Fords sometimes had broached main caps; the broach is essentially a giant file and leaves a very slight wavy finish t...
- Sun Apr 05, 2020 5:15 pm
- Forum: Engine Tech
- Topic: interesting header-exhaust port alignment on Honda "Fireblade" engine
- Replies: 5
- Views: 1133
Re: interesting header-exhaust port alignment on Honda "Fireblade" engine
That inlet tract shape looks peculiar too.
- Sun Apr 05, 2020 5:11 pm
- Forum: Engine Tech
- Topic: Another lifter to bore clearance question
- Replies: 11
- Views: 2005
Re: Another lifter to bore clearance question
I don't know if Ford officially changed their spec, but .0025" seemed to be normal for roller 5.0 blocks. Flat tappet blocks all seemed to be .001-.0015".
- Sun Apr 05, 2020 5:09 pm
- Forum: Engine Tech
- Topic: Mismatched 289 combo
- Replies: 32
- Views: 3637
Re: Mismatched 289 combo
In my experience, street 289s have performed best with cams in the 108 range for sticks or high stall converters, 110 for stockish converters. Wide lobe centers seem to just flatten the power curve with no advantage anywhere. Even if you don't change the cam, degreeing the one you have would be a go...
- Wed Apr 01, 2020 11:13 am
- Forum: Engine Tech
- Topic: Relocating oil pump pickup hole
- Replies: 10
- Views: 1274
Re: Relocating oil pump pickup hole
Move the pickup opening to wherever it's most likely to stay in oil. For that matter, you can bend or relocate the whole pickup if that's what it takes.
- Mon Mar 30, 2020 7:14 pm
- Forum: Engine Tech
- Topic: Wrong direction on stroke
- Replies: 19
- Views: 2522
Re: Wrong direction on stroke
Herb Adams destroked a Pontiac 400 to 303 CID to meet SCCA class limits in the late '60s. It used a 2.84 inch Moldex crank and 7.08 inch Carrillo rods.
- Mon Mar 30, 2020 7:04 pm
- Forum: Engine Tech
- Topic: Main Bearing Oil Hole Alignment
- Replies: 16
- Views: 3102
Re: Main Bearing Oil Hole Alignment
I always grind my oil passages over so they line up with the slots in the bearing shells, but it's more a matter of pride in workmanship than knowledge it does anything necessary. I put restrictors to the cam bearings too, usually .062 or .078. You can just drill new, smaller holes in the cam bearin...
- Thu Mar 26, 2020 4:29 am
- Forum: Engine Tech
- Topic: I am 84 YO., and building my last SBC 400 and will be over
- Replies: 24
- Views: 3888
Re: I am 84 YO., and building my last SBC 400 and will be over
I've listened to all the exposition about bearing speed, oil heating, frictional losses, yadda yadda, but I've also taken apart a lot of 400 cores and never noticed any unusual main bearing issues, and I freshened up many 400 and 375 dirt track motors back when useable factory blocks were still a th...
- Thu Mar 26, 2020 4:21 am
- Forum: Engine Tech
- Topic: 5 bolt SBF rear pattern blueprint
- Replies: 13
- Views: 2236
Re: 5 bolt SBF rear pattern blueprint
Many of those dimensions were fractions... Lots of engineering and machining in the USA operated in fractional inches until WWI, when several Detroit automakers and other prime contractors petitioned the War Department to standardize on decimal inches to make dealing with subcontractors easier. Mos...
- Thu Mar 26, 2020 4:06 am
- Forum: Engine Tech
- Topic: Lash caps thickness
- Replies: 8
- Views: 1382
Re: Lash caps thickness
That page in my notebook is dated 1996, which seems like just the other day... for 11/32 stems: .060 Bill Mitchell .080 Sig Erson .050 Chet Herbert .080 Comp Cams .060 Crane .080 Clay Smith .050 Crower .060 Lunati .060 Ultradyne .080 Norris .080 Del West .080 Manley .080 Precision Products .062 Wolv...