Thread: Need help getting a new engine
-
10-23-2018 11:32 AM #16
I would love to chime in, but all I get from your links is some BS about vigilink.
Let me warn you about the flexplate. Most everybody is using flexplates from an offshore source (read China) and the thin material will not hold up. Buy an SFI certified flexplate that was meant for drag racing (SFI 29.1) and sidestep the problem.
.PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.
-
Advertising
- Google Adsense
- REGISTERED USERS DO NOT SEE THIS AD
-
10-24-2018 06:54 AM #17
Thank you Denny.
.PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.
-
10-24-2018 08:51 AM #18
I probably should add this as well. You didn't say what your rear gears were in the initial post. Both of the engines you listed will be happiest with at least a 3.5 rear gear. More would be better. 3.73 or higher would be a good choice depending on tire diameter.
That's the problem with increasing cam duration. Contact ATK to find out what cruise RPM's at 60 MPH they recommend. I'm going to guess around 2500.Mike
I seldom do anything within the scope of logical reason and calculated cost/benefit, etc-
I'm following my passion
-
10-24-2018 08:31 PM #19
- Join Date
- Jul 2018
- Location
- smithfield
- Car Year, Make, Model: 1947 Ford Coupe
- Posts
- 34
- Blog Entries
- 1
-
10-25-2018 02:16 AM #20
Without the correct gearing, you will not get the benefit of all that advertised HP. If the engine is forced to lug around at low RPM, you will be worse off than with a stock engine. It will feel very sluggish and fuel economy will be terrible. ATK also recommends a higher stall converter than stock. If you don't want to change the gears and converter, you would be better off with a milder engine.
Depending on your tire size, you might get by with the 3.23's. The cams in both engines are for building power and torque in the midrange to high RPM's. The cam I had in my 383 was milder than the one in the ATK and I barely got by with 3.23's. The 383 is good at making torque, but the cam still programs the power characteristics of the engine.
Sorry if this sets you back, but you need all the info before spending all your hard earned cash.Mike
I seldom do anything within the scope of logical reason and calculated cost/benefit, etc-
I'm following my passion
Welcome to CHR. I think that you need to hook up your vacuum advance. At part throttle when cruising you have less air and fuel in each cylinder, and the air-fuel mixture is not as densely packed...
MSD 8360 distributor vacuum advance