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Edelbrock 7750 / 7751 Casting The 7750 & 7751 are the same cylinder head with exception of .080" material added to the deck and .055" material added to the intake flange on the 7751. Additional deck material is to increase combustion chamber volumes. To provide a common reference, all flow numbers are based on a 7750 casting. 58/107 Valve spacing 5 deg. Intake flange HUT 1 Intake runner volume 248cc Combustion chamber volume 52cc Intake Valve 2.150 dia. x 5.550 length* Serdi # H1N1 Exhaust Valve 1.625 dia. x 5.550 length* Serdi #'s 1st cut: H1X1 2nd cut: H1X2 Intake port opening at gasket 2.2H x 1.345W Distance from floor to deck at gasket 1.15 Intake min. cross sectional dim. 2.751 sq. in. HUT 1.1 Intake runner volume 256cc Combustion chamber volume 56cc/65cc Intake Valve 2.180 dia. x 5.550 length* Serdi #'s 1st cut: H1.1N1 2nd cut: H1.1N2 Exhaust Valve 1.625 dia. x 5.550 length* Serdi #'s 1st cut: H1X1 2nd cut: H1X2 Intake port opening at gasket 2.2H x 1.345W Distance from floor to deck at gasket 1.15 Intake min. cross sectional dim. 2.751 sq. in. HUT 2 Intake runner volume 264cc Combustion chamber volume 53cc/64cc Intake Valve 2.180 dia. x 5.550 length* Serdi #'s 1st cut: H1.1N1 2nd cut: H1.1N2 Exhaust Valve 1.625 dia. x 5.550 length* Serdi #'s 1st cut: H1X1 2nd cut: H1X2 Intake port opening at gasket 2.2H x 1.36W Distance from floor to deck at gasket 1.15 Intake min. cross sectional dim. 2.776 sq. in. *Valve length with 2" installed spring height. Generally, smaller bore sizes & lower chamber volumes will cause lower air flow numbers but not necessarily less horsepower. All programs can be reduced in volume approximately 7cc which will reduce air flow above .5 lift approximately 5 CFM.
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