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.
هذه القصة مأخوذة من طبعة October 2023 من Hot Rod.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
بالفعل مشترك ? تسجيل الدخول
هذه القصة مأخوذة من طبعة October 2023 من Hot Rod.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
بالفعل مشترك? تسجيل الدخول
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