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2.20 intake valve in a 60/40 Brodix -12 ?

General engine tech -- Drag Racing to Circle Track

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levisnteeshirt
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2.20 intake valve in a 60/40 Brodix -12 ?

Post by levisnteeshirt »

Anyone ever do it ? The wider valve spacing doesn't count
Walter R. Malik
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Re: 2.20 intake valve in a 60/40 Brodix -12 ?

Post by Walter R. Malik »

levisnteeshirt wrote: Sat Sep 25, 2021 9:24 pm Anyone ever do it ? The wider valve spacing doesn't count
The exhaust valve needs to be a bit smaller but, it certainly can be done.
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mag2555
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Re: 2.20 intake valve in a 60/40 Brodix -12 ?

Post by mag2555 »

According to my Brodix catalog the 2.20”/1.60” is a option on a 70/125 valve centerline for the - 12 heads.
The intake port goes from 287 CCs to 305 with that change.

You will need a rocker shaft system with that move also due to the needed .180” offset lifters I guess!
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Re: 2.20 intake valve in a 60/40 Brodix -12 ?

Post by levisnteeshirt »

been watching some Eric Weingartner videos ,, he puts a 1.56 exhaust valve in some of his heads ,,, i dunno ,,, I made this post and wanted to see if anyone came back with a response ,, they have 2.150's in em now ,

i probably need to get newer heads ,, these have the raised runner and not the hump in the floor ,, been hearing these are more desirable , Brodix went back to offering a RI -12

If I can get them in the 750-775 range on a 434 I think they'll do fine ,, from what I read a sprint 406 on alcohol MFI has been doing 800 with these for quite some time

i might order a 2.20 valve and see what things look like
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