COMPLETE DESTRUCTION!
Hot Rod|October 2023
We put our 350 small-block and LS1 on the dyno to see which made more power.
JEFF SMITH
COMPLETE DESTRUCTION!

Over the past year, we assembled two very mild small-blocks aimed at the typical hot-rodder looking for a solid street engine built on a budget. Once both engines were assembled, HOT ROD Editor John McGann suggested we test both to see how they compared, which we thought was a great idea.

In case you missed the buildups on the two engines, the first was the 355ci small-block Chevy using a 1986-and-later one-piece rear-main seal block that we built to replicate the affordable crate engine that Chevrolet used to sell but has discontinued. We upgraded our engine with cast-iron Vortec cylinder heads and more compression in "Modest Mouse" (Nov. 22).

The LS engine was a slightly different approach. It started life as a Gen-III iron 5.3-liter that was machined out to an LST's bore size and fitted with a similar hydraulic roller camshaft. The 10.8:1 compression was higher mainly because we retained the smaller 5.3-liter cylinder heads, which have a smaller chamber size. Both engines used dual-plane intake manifolds and the same Holley 750-cfm mechanical-secondary carburetor.

Because the small-block Chevy was originally assembled with a flat-tappet hydraulic cam, we thought the addition of a hydraulic roller cam with similar timing numbers would make this comparison a bit more fair for the little small-block. This conversion was easy since the engine we chose to build was a post1986 one-piece rear-main seal block designed to employ a factory hydraulic roller camshaft.

Once that was completed, we arranged with Summit Racing to test both engines on their SuperFlow Powermark engine dyno at Trick Flow Specialties in Tallmadge, Ohio.

Diese Geschichte stammt aus der October 2023-Ausgabe von Hot Rod.

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Diese Geschichte stammt aus der October 2023-Ausgabe von Hot Rod.

Starten Sie Ihre 7-tägige kostenlose Testversion von Magzter GOLD, um auf Tausende kuratierte Premium-Storys sowie über 8.000 Zeitschriften und Zeitungen zuzugreifen.