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Discussion Starter #1
so I have a stock 307 from a 72 nova the only thing done is a better exhaust what do i need to get and do to the 307 to put the 416 heads on so that it will run right for the street?
 

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King of my Man-cave.
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2,896 Posts
For a bolt-on, those heads will work fine. You will end up with 8.95:1 with an aftermarket composite gasket (Fel-Pro 7733pt2). A Performer-style and a 600 CFM vacuum secondary carb would top it off nicely.
 

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Wrench Turner
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4,952 Posts
Is the head swap the only change you're making? Not that it won't help,but,it's not gonna make alotta difference if you don't build on to take advantantage of the added CR,flow of the upgraded heads.
 

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Wrench Turner
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4,952 Posts
If you're gonna replace the intake,then I'd definitely consider the L30/305 heads over the 416's.They will perform better bone stock than the ported 416's.The L31/350 heads would be an even better choice,but,you would need to have approx .040" removed from the decks to keep chambers down to approx 58cc.The L30/305's will flow around 220cfm @ .500 lift.You will need to provide additional seal to retainer clearance for over .450 lift cam.A good recipe for a 307/305 is the L30 heads w/beehive springs,262 cam & a 650 carb on a Vortec Performer RPM intake, headers/free flowing exhaust.This combo performs really well & makes a good driving street engine.Verify your compression is in the 9.5:1 range for that 262 cam.Flat top pistons,58cc heads, .040ish on quench/squish(measurement from piston top to heads w/ gasket installed) should get you close.
 
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