{"product_id":"proflow-cylinder-heads-ls1-supermax-250-holden-commodore-chevrolet-aluminium-bare-61cc-chamber-250cc-intake-runner-11deg-pair","title":"Proflow Cylinder Heads, LS1 SuperMax 250, Holden Commodore, Chevrolet, Aluminium, Bare 61cc Chamber, 250cc Intake Runner 11deg,  Pair","description":"\u003cp\u003e\u003cstrong\u003eLS1 SuperMax 250, Aluminium Cylinder Heads 11deg, Holden Chev, Bare\u003c\/strong\u003e\u003c\/p\u003e\r\n\r\n\u003cp\u003eProflow does not sacrifice quality for a low price--you get both with our aluminium cylinder heads. The lightweight heads are cast from A-356 aluminium alloy with a large choice of engine, for SB \u0026amp; BB Chevrolet, LS Chev Holden Ford SB 289-351W, 302, 351 Cleveland 2V \u0026amp; 3V \u0026amp; BB FE, and Chrysler SB \u0026amp; BB. They have phosphorous bronze valve guides, and ductile iron valve seats for use with unleaded gas. They're also end-milled and drilled for accessories. The fully assembled heads have stainless steel valves, high performance valve springs, 7 degree valve locks, rocker arm studs, and guideplates. Perfect for your Mild or High performance Hot Rod. \u003c\/p\u003e\r\n\r\n\u003cp\u003eProflow's  SuperMax LS1 Cylinder Heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location\/performance. This budget friendly head is perfect for your OEM engine operating below 6300 RPM.\u003c\/p\u003e\r\n\r\n\u003cp\u003eSpec;s\u003c\/p\u003e\r\n\r\n\u003cp\u003eHead Gasket Cometic #C5475\/5751-051 or equivalent\u003cbr\u003e\r\nHead Bolts ARP #134-3610\u003cbr\u003e\r\nHead Studs ARP #234-4317\u003cbr\u003e\r\nRocker Arms OE LS3 style ONLY (no stud\/guideplate conversions etc.)\u003cbr\u003e\r\nIntake Port (cc) 250cc\u003cbr\u003e\r\nIntake Port Dimensions 3.22\" x 1.12\"\u003cbr\u003e\r\nExhaust Port (cc) 101cc\u003cbr\u003e\r\nExhaust Port Location Stock\u003cbr\u003e\r\nExhaust Port Dimensions 1.63\" x 1.73\"\u003cbr\u003e\r\nIntake Valve Size 2.08\"\u003cbr\u003e\r\nExhaust Valve Size 1.60\"\u003cbr\u003e\r\nValve Angle 11°\u003cbr\u003e\r\nValve Spring Pocket O.D. 1.55\"\u003cbr\u003e\r\nValve Guide Size 8mm .500\" (Top) .560\" (Base)\u003cbr\u003e\r\nDeck Thickness .750\"\u003cbr\u003e\r\nCombustion Chamber (cc) 62cc\u003cbr\u003e\r\nSpark Plug Size 14mm x .750\" Gasket \u003cbr\u003e\r\nSpark Plug Location\/Angle OE\/Angle\u003c\/p\u003e","brand":"Proflow","offers":[{"title":"Default Title","offer_id":55002595000533,"sku":"PFEAHCLS1-250-BARE","price":2640.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0825\/0635\/0805\/files\/PFEAHCLS1-250-BARE.jpg?v=1791288313","url":"https:\/\/sorgiovannimotorsport.com.au\/products\/proflow-cylinder-heads-ls1-supermax-250-holden-commodore-chevrolet-aluminium-bare-61cc-chamber-250cc-intake-runner-11deg-pair","provider":"Sorgiovanni Motorsport","version":"1.0","type":"link"}