mixing early/late BBC parts

Ken Haase · 04-24-2009, 12:39 AM

Alan, thanks for the additional info. You've prompted a new batch of question's, if you don't mind answering them.
What gear ratio was your truck? My dually has 4.10's.
Did you use a 'stock' converter, or one for towing?
Your thoughts on stroking to 496. That would boost the compression ratio a little.
Best header tube size?
Did you stay with a Q-jet? Manifold?

This is an '86 C-30, so no OD. The engine is a low miles 454/425 crate. The Vortec heads you mentioned came out in '96 I believe, so they should be a direct bolt-on. I know the smart play would be to buy a late model diesel. But, since my wife recently lost her job (30+ years as an RN with the same hospital), the bucks just aren't there. Realistically, probably not for these engine mods either. We'll see.

I appreciate everybody's help.

04-24-2009, 12:39 AM	#8
Ken Haase Member Join Date: Mar 2007 Posts: 233 Likes: 0 Liked 1 Time in 1 Post	Re: mixing early/late BBC parts Alan, thanks for the additional info. You've prompted a new batch of question's, if you don't mind answering them. What gear ratio was your truck? My dually has 4.10's. Did you use a 'stock' converter, or one for towing? Your thoughts on stroking to 496. That would boost the compression ratio a little. Best header tube size? Did you stay with a Q-jet? Manifold? This is an '86 C-30, so no OD. The engine is a low miles 454/425 crate. The Vortec heads you mentioned came out in '96 I believe, so they should be a direct bolt-on. I know the smart play would be to buy a late model diesel. But, since my wife recently lost her job (30+ years as an RN with the same hospital), the bucks just aren't there. Realistically, probably not for these engine mods either. We'll see. I appreciate everybody's help.