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Old 10-17-2007, 07:04 PM
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TH350 vs. 7004R? Also, gears?

I found a good deal on a 1997 vortec truck block and heads and figured I'm sick of the 307 anyway. The block has about 25k on it and is super clean, and the heads are nicely reworked by Competition Products out of Oshkosh w/ 2.02 / 1.6 valves and are set up for a .550 lift roller cam (see pics if the attachment worked). Are those titanium retainers? I have a set of Comp roller tipped 1.52s for self-aligning heads, too.

Here's my issue. I've got a '71 Malibu with 40k original on it, a TH350 and 2.73s. 25 inch BFGs, not super sticky drag tires. I'm planning on 350-375 hp out of this motor and I'd like to go sub-14s in the quarter (which I will probably only get to do once a summer). I'd also like good all around driveability with close to 20 mpg on the highway.

SO . . . .

Will the original TH350 hold up to this with a cooler and deep pan?

Should I get a TH350 built for this application? I have an older one I could use.

Should I stick with the 2.73s (again, I want to do some highway driving)? I'd be okay with 3.08s or 3.23s even.

OR

I do have a 7004R with real low miles on it, out of a 1990 Astro Van. Will this handle that kind of power? I understand this will involve 3.55s or 3.73s in the rear, a shortened driveshaft, TV cable adjustment issues, and a lock-up controller.

OR

Should I keep the motor mild and slap it in with the TH350, then maybe later upgrade gears if I want more performance?


A big thing to consider is that as soon as this project is done, I have a '47 Ford street rod in the works, so I will probably plan on reusing my original 307 and overall price is an object. If I'd be better served using the 7004r in that, then fine.

Also, I want to get rolling. So if a 7004r will take forever to set up, then screw it.

Thanks for all your help.

Last edited by 307malibu; 10-17-2007 at 07:06 PM. Reason: adding pics
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