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521 Build Questions

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521 Build Questions Empty 521 Build Questions

Post  Kerupshen December 9th 2019, 2:39 pm

New to the forum, and one of the first times building my own combination from scratch, so I was wondering opinions on how much power my combo will make and any tips anyone has is appreciated.
Here's what I've collected so far
-521ci. 4.390 bore x 4.300 stroke, 6.8" long H-Beam rods.
-70 Police Interceptor 4-bolt main block
-Forged flat top Wiesco pistons
-Lunati cam: .641 Lift, 271/279 Duration@.050
108/102 LSA/ILC, 4500-8000 RPM Range
-Cheap Aluminum Heads: Flow 322/195 cfm@.600 lift intake/exhaust, 95cc chamber.
-Tall open plenum Ford Motorsport intake
-1050cfm Barry Grant Dominator

Planning on putting it in my Mustang Drag Car


Kerupshen

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Join date : 2019-11-30

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Post  rmcomprandy December 9th 2019, 8:04 pm

Kerupshen wrote:  New to the forum, and one of the first times building my own combination from scratch, so I was wondering opinions on how much power my combo will make and any tips anyone has is appreciated.
  Here's what I've collected so far
-521ci. 4.390 bore x 4.300 stroke, 6.8" long H-Beam rods.
-70 Police Interceptor 4-bolt main block
-Forged flat top Wiesco pistons
-Lunati cam: .641 Lift, 271/279 Duration@.050
108/102 LSA/ILC, 4500-8000 RPM Range
-Cheap Aluminum Heads: Flow 322/195 cfm@.600 lift intake/exhaust, 95cc chamber.
-Tall open plenum Ford Motorsport intake
-1050cfm Barry Grant Dominator

Planning on putting it in my Mustang Drag Car


Not exactly how I would do it but, with a good quality valve train, that combination should be near 700 horsepower; (If the heads are Cobra Jet size ports).

Be sure to use a good oil pan and system.

rmcomprandy

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Location : Roseville, Michigan

http://www.rmcompetition.com

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Post  gt350hr December 10th 2019, 2:26 pm

The only downfall is the compression is only 10.6 or so. Randy's right it should be around 700.

gt350hr

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Location : Anaheim , CA

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Post  Dave De December 10th 2019, 11:12 pm

700 HP? I dont know about that when it looks like the heads are Pro Comp.
Better to go SCJ's or P-51's on this package.
Dave De
Dave De

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Location : Highland, MI

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