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Original Message
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| RE: Opinions wanted for street 390 |
| By Bob - 12/16/2001 10:44:18 AM; IP 65.80.204.94 |
1) will a stock rebuilt shortblock handle the 400+ hp fine? How far can I comfortably overbore a 390 block? .060?
Yes 400+ HP is no problem. Get the block sonic checked before you overbore it. Sometimes .030 is all you can safely get but .080 is not unheard of. The stock 390 bore is 4.05, and the 406 and 428 share the same bore: 4.13. The 390 and 406 has a 3.78 str0ke and the 420 has a 3.98 stroke. There was a also 410 engine in the '66-'67 Mercury that used the 390 bore and the 428 stroke. A 030 over bored 390 using the 428 crank gets you 416 cubic inches.
2) Would it be cost effective horsepower to toss in a 428 crank to pump my engine up to a 406? I know the 428's externally balanced, but other than getting a vibration dampener and 428 flywheel, are there any other pitfalls to this conversion? Would I need different rods, or just different pistons to make this work?
Use the truck 390 pistons referenced a few posts down. The vibration damper and pulleys from any '68 to '76 FE is what you need.
3) I chose Performer RPM since they're new parts instead of 30+ years old, lighter weight, fairly streetable. Is the performance similar to an original CJ setup? Better?
Performance is better but the Edelbrock heads not necessary for the street.
4) Since Performer RPM's power curve really kicks in around 1500 rpm rather than just off idle, would it be a good idea to use a higher stall speed torque converter for my C6?
No. No engine kicks in just off idle. You'll be fine with a stock converter.
5) is it possible, without modification of the heads to install Dove roller rockers on these heads? If so, will the added performance be worth the cost for a street FE?
Roller Rocker arms are expensive and totally unnecessary for a street engine. They are needed for cams with over .600 lift and heavy valve springs.
6) Is it recommended to use Mallory or MSD electronic ignition over the dual point distributors? Will there be any difference other than less maintenance.
No one uses points. The Pertronics conversion and the MSD box or a Mallory Unilite conversion are what most people use on the street.
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