Build a Lightning Bronco?

wyrmrider · Post by **wyrmrider** » Tue Jul 28, 2015 8:48 pm

you still got lots of good parts
find a HR block
there are differences
I have an 83 302 bronco that will need a motor someday
Lighting sounds good with an
AOD instead of C6

Carnut1 · Post by **Carnut1** » Wed Jul 29, 2015 12:13 am

Thanks wyrmrider, I appreciate your input. Did some research on the 351w roller blocks and found out they have a problem cracking from the spider hold downs through the cam bearing oil feed hole. I may be looking for an older block!

JWebb · Post by **JWebb** » Thu Jul 30, 2015 1:23 am

The F4TE will live a long, happy life for what you want and will make using a HR cam much more affordable. I'd be looking for another one.

Carnut1 · Post by **Carnut1** » Thu Jul 30, 2015 4:49 pm

I think you are right JWebb. I found one builder who will not us the f4te block for any applications. He states that 3/10 are cracked upon disassembly and that was while making 200hp!

Carnut1 · Post by **Carnut1** » Thu Jul 30, 2015 6:00 pm

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Gt40 upper .015" lip

Carnut1 · Post by **Carnut1** » Thu Jul 30, 2015 6:03 pm

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Gt40 upper quickie blend.

Carnut1 · Post by **Carnut1** » Fri Jul 31, 2015 6:46 pm

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Gt40 lower front runner with large dog leg and only 2.09 sq in area.

Carnut1 · Post by **Carnut1** » Fri Jul 31, 2015 6:49 pm

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Gt40 large dogleg runner rough out

Carnut1 · Post by **Carnut1** » Fri Jul 31, 2015 6:52 pm

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Gt40 lower less dogleg runner

Carnut1 · Post by **Carnut1** » Fri Jul 31, 2015 6:53 pm

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Gt40 lower less dogleg rough out

Carnut1 · Post by **Carnut1** » Mon Aug 03, 2015 8:53 pm

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Lower gt40 before

Carnut1 · Post by **Carnut1** » Mon Aug 03, 2015 8:58 pm

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Lower gr40 after rough out.
I did some reaserch on this manifold and TMoss porting states that the stock lightning 351w lower flows 280 cfm! I will not be able to make the heads flow that so this may be a wasted effort but a look at the manifold with such steep doglegs I find it hard to believe it flows so well. Does anyone have solid info on gt40 intake and head flow? Stock vs. Ported. Thanks. Charlie

Carnut1 · Post by **Carnut1** » Thu Aug 06, 2015 4:20 pm

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Stock 65mm lightning throttle body with .1" flat leading edge and .035" step before the blade.

Carnut1 · Post by **Carnut1** » Thu Aug 06, 2015 4:24 pm

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Leading edge rough out

Carnut1 · Post by **Carnut1** » Thu Aug 06, 2015 4:30 pm

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Cardboard protected blade.

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