I am slowly collecting parts for my 350. I am looking at the new vortec bowtie heads.
Vortec Bow-Tie has all-new ports that are taller and narrower, the idea being to increase velocity while maintaining volume. The heads are available in "small-port" (PN# 25534421) or "large-port" (PN# 25534431) versions, with the small-port heads boasting 185cc intake runners and 65cc exhaust ports; and the large-port heads cast with 215cc intake ports and 84cc exhaust ports.
Out of the box, the heads come with 66cc combustion chambers and 0.450-inch deck surface thickness. GMPP tells us a camshaft with up to 0.530-inch lift will work with the heads, too. Assembled heads come with 2.00/1.55 valves, too. Additional details include mounting provisions for early-style valve covers or the later-style center bolt covers, as well as mounting holes for earlier six-bolt intake manifolds and later-style four-bolt Vortec manifolds.
I am going to roller retrofit and use quench pistons(about 9 to 1 compression). I got a set of HP exhaust manifolds and risers from Dennis Moore Performance(ebay).
These heads look promising.
What do you all think?
Cheers.
Vortec Bow-Tie has all-new ports that are taller and narrower, the idea being to increase velocity while maintaining volume. The heads are available in "small-port" (PN# 25534421) or "large-port" (PN# 25534431) versions, with the small-port heads boasting 185cc intake runners and 65cc exhaust ports; and the large-port heads cast with 215cc intake ports and 84cc exhaust ports.
Out of the box, the heads come with 66cc combustion chambers and 0.450-inch deck surface thickness. GMPP tells us a camshaft with up to 0.530-inch lift will work with the heads, too. Assembled heads come with 2.00/1.55 valves, too. Additional details include mounting provisions for early-style valve covers or the later-style center bolt covers, as well as mounting holes for earlier six-bolt intake manifolds and later-style four-bolt Vortec manifolds.
I am going to roller retrofit and use quench pistons(about 9 to 1 compression). I got a set of HP exhaust manifolds and risers from Dennis Moore Performance(ebay).
These heads look promising.
What do you all think?
Cheers.
