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347 vs. 393 in my '88 Coupe

Ian 22.07.2012, 01:26
I'm considering going 347 or 393. The car is a weekend driver, maybe 30 miles a week (if the weather is nice.)

I'm concerned about longevity -- I'd like to give it to my son when he's old enough (he is currently 5 years old.)

It may see one or two trips to the track per year, if that.

I'd like to get about 450 HP (500 HP would be ideal, but is that easily attainable?) or so out of the motor, and I'd like to keep it under 6500 RPM.

I'd also like for it to be streetable.

What are the tradeoffs if I decide to go with a 393? What additional considerations do I need to make?

I believe on the coupe I'd just need a different oil pan, headers and a hood (anything else I"m missing?)

Thanks for the advice!

Ian
67mustang 22.07.2012, 02:05
I like my 393, It has been in my car for 3 years with no problems at all. It made 447 rwhp n/a, and 656 on a 150 pill. The power your looking for shouldn't be a problem at all.
Ian 22.07.2012, 02:11

Originally Posted by 67mustang:

I like my 393, It has been in my car for 3 years with no problems at all. It made 447 rwhp n/a, and 656 on a 150 pill. The power your looking for shouldn't be a problem at all.

Is it pretty streetable? What heads/intake/cam do you have?

Ian
67mustang 22.07.2012, 02:24
It is pretty streetable around town, don't really like driving on the highway. It has a c4 and a 4500 converter though. The heads are out of the box afr 205s, edelbrock super victor intake, and the cam is a shelf comp solid roller, 254/260 .660/.666 110 lsa.
69fastback 23.07.2012, 13:23
It's stupid easy to meet those goals with a 393/408, and be completly streetable.
john-dickjr 23.07.2012, 14:03

Originally Posted by 67mustang:

It is pretty streetable around town, don't really like driving on the highway. It has a c4 and a 4500 converter though. The heads are out of the box afr 205s, edelbrock super victor intake, and the cam is a shelf comp solid roller, 254/260 .660/.666 110 lsa.

what kind of et
91TurboCoupe 23.07.2012, 14:10

Originally Posted by 69fastback:

It's stupid easy to meet those goals with a 393/408, and be completly streetable.

This. The more cubes, the easier it is to make power and stay streetable. In terms of longevity and streetability, keeping the peak HP down under 6000ish RPM will go a long way toward both goals. The only downsides to a windsor-based motor is all the 351W-specific parts you have to buy, and the fact that you can't easily fit it under a stock hood if thats a concern.
67mustang 23.07.2012, 23:27

Originally Posted by john-dickjr:

what kind of et

1/8 6.00 @ 113 on a 82 jet
1/4 9.88 @ 135 on a 65 jet
tobuyitright 24.07.2012, 02:20

Originally Posted by 67mustang:

1/8 6.00 @ 113 on a 82 jet
1/4 9.88 @ 135 on a 65 jet

That makes me feel funny.
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