Questions on 351w build

first, dump the GT40 heads, sell them to someone building a 289 or 302, and get yourself a set of world products windsor sr heads, or a set of afr 205s, or even the edelbrock victor jr heads.

you mentioned a mild cam, what specs? you are going to want a cam that works in the 1500-6500 rpm range to get into the 12's. understand that the rear end will need to be upgraded to a healthy 8" at least, a 9" would be better in this case.

you are also going to want to upgrade to a 750cfm carb as well, the 650 wont be enough.

as for headers, you are going to want a header with a 1 5/8" primary tube, 1 3/4" is better, and a 3" to 3 1/2" collector.

as for an intake, you want at least a weiand stealth intake or an edelbrock performer rpm air gap intake. with around 10:1 compression, you should be making about 450-500hp depending on how well you can tune the engine combination. with 3.89 gears and decent tires, that should get you into the high 12s.

I'll take those heads off your hands!

Victor Jr's work really well out of the box!

Windsor Jr/Sr heads were great when they came out 25 years ago or whenever, but compared to a TFS or AFR, they suck. I wouldn't waste my time with them especially with their relocated spark plugs. If all you're trying to do is get into the hi to mid 12s, no need to get a monster cylinder head. I bet a TFS 170 would easily be enough with the right setup, or go with a 185 for a little more room to grow down the road. With something like a stage 2 cam, 3000 stall converter, and a 4.10 gear there should be no excuse to go slower than mid 12s. If you want to keep the gt40 heads, they'll work, but I would definitely do some port work to them.

rbohm said:

with around 10:1 compression, you should be making about 450-500hp depending on how well you can tune the engine combination. with 3.89 gears and decent tires, that should get you into the high 12s.

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Isn't 450hp, let alone 500 a bit extreme for shooting at high 12s? A significantly milder build could do that IMO, even on a 302 shortblock.

65ShelbyClone said:

Isn't 450hp, let alone 500 a bit extreme for shooting at high 12s? A significantly milder build could do that IMO, even on a 302 shortblock.

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that depends on his suspension setup, tires, vehicle weight, etc. could he run 12s with less power? perhaps, but would it run consistent 12s with less power?