Originally posted by McGuire
A circa-1970 ZL1 weighs more than 550 lbs, of that I am certain.
Quoting and comparing engine weights is always fraught due to differences in dress. Does the figure include the starter, flywheel, generator/alternator, water pump, air cleaner, exhaust manifolds, etc? There's easily 100+ lbs right there. Also, all the above, some, or none? And *which* flywheel? Which starter? Also, when comparing weights we need to know what year. A 1955 Chevy V8 weighs 560 lbs in production dress, but by 1985 it was well under 500 lbs due to lighter block and head castings, tubular manifolds, aluminum intake etc.
Would you believe that a ZZ4 350 crate engine is actually lighter than an all-aluminum 2008 LS7? True, as I recently learned. The dry sump system and EFI harness and components add weight. Meanwhile, SBC iron block castings are considerably lighter than they used to be.
There are lists circulating the Internet and elsewhere purporting to show the weights of various popular engines. Some of the numbers look very dubious to me. All sorts of numbers from all sorts of sources with all sorts of purposes on one list.
In my view, a 1963-style aluminum SBC as used by Thompson would weigh in the neighborhood of 400 lbs, right in the range claimed by Ford for the DOHC Indy V8. Their weights would be very similar IMO.
Chevy small block V8 575 (generic for '60s-'70s motors)
Chevy small block V8 535 (1) ('59 Corvette 283 w/alum. intake)
Chevy small block LS1 460 (185)
Chevy 5.7 industrial V8 434 (182) '99 iron long block w/water pump only
Chevy LT-5 DOHC 5.7 600 (122)
Chevy L98 5.7 V8 600 (122)
Chevy V8 348/409 620 (1)
Chevy V8 348/408 655 (83)
Chevy big block V8 685 Mark IV
Chevy big block V8 --- Mark V
Chevy 454 675 (10)
Chevy 7.4L V8 656 (183) iron, no intake, exh, carb, starter
Chevy 427 ZL-1 550 (35) all-aluminum, "20# lighter than SB"
Chevy 6.5L Diesel V8 644 (183)
Chevy 400 SB 470 (235) aluminum heads and intake, no acc. or wp
Chevy 396 BB 610 (235) iron heads, alum. wp and intake, no acc.
Now you are correct, there is no source that simply gives weight of block and heads, sadly, but the 550lbs. is the number I first heard (I can still see the picture in my mind that came with the article, if only my memory were that good with everythng) thirty eight years ago.
Along with it was it was 125 pounds lighter than the iron version and I remember 25, not twenty pounds ligher than a ferrous SB.
In an odd note, the new Pop. Hot Rodding
has an article on Detroit crate engines and bare parts, if desired.I bought the mag as the numbers I gave did not seem right and were not.
The heads and block are Dart but:
The iron SB chevy is apprx. 50lbs. heavier, bare block and heads, than the iron SB Ford.
But in the aluminum versions the difference is closer to ten pounds.
This does not transfer directly to forty some years ago as there are various after markent blocks and heads that differ greatly in weight due to application they are aiming at nowadays.