Go Back   The Supercar Registry > General Discussion > Technical & Restoration


Reply
 
Thread Tools Display Modes
  #1  
Old 03-29-2017, 02:47 PM
markinnaples markinnaples is offline
Senior Member
 
Join Date: Jan 2006
Location: Naples, FL
Posts: 4,637
Thanks: 21,542
Thanked 1,365 Times in 662 Posts
Cool Blower motor questions

I know this is a little out of the ordinary here, but I know there are a lot of knowledgeable people on here. I want to swap out the 302 with tunnel ram in my Camaro for a relatively mild small block with a blower, but not sure where I should start with the new engine.

Would you all suggest buying a lower compression crate motor, beefing up the bottom end and putting the blower on that, finding a running small block and rebuilding it to blower-ready specs, or just scrapping it all and starting with a bare block and going from there?

I can only afford to do this over time, buying some parts with each pay and finishing this over six months or a year. Appreciate any thoughts/expertise you can provide, thanks.
__________________
1968 Camaro Ex-ISCA Show Car
John 10:30
Reply With Quote
Click here to view all the pictures posted in this thread...
  #2  
Old 03-29-2017, 03:50 PM
cook_dw cook_dw is offline
Banned
 
Join Date: Oct 2003
Posts: 4,322
Thanks: 623
Thanked 1,487 Times in 609 Posts
Default

Are you wanting looks or performance out of the blower?
Reply With Quote
  #3  
Old 03-29-2017, 04:03 PM
markinnaples markinnaples is offline
Senior Member
 
Join Date: Jan 2006
Location: Naples, FL
Posts: 4,637
Thanks: 21,542
Thanked 1,365 Times in 662 Posts
Default

A little of both, but it'd just be for cruising and not really any racing.
__________________
1968 Camaro Ex-ISCA Show Car
John 10:30
Reply With Quote
  #4  
Old 03-29-2017, 04:16 PM
cook_dw cook_dw is offline
Banned
 
Join Date: Oct 2003
Posts: 4,322
Thanks: 623
Thanked 1,487 Times in 609 Posts
Default

Which blower are you looking at getting?
Reply With Quote
  #5  
Old 03-29-2017, 07:10 PM
markinnaples markinnaples is offline
Senior Member
 
Join Date: Jan 2006
Location: Naples, FL
Posts: 4,637
Thanks: 21,542
Thanked 1,365 Times in 662 Posts
Default

I was thinking a 6-71 or some similar variant, but I've just started researching the entire thing, thanks.
__________________
1968 Camaro Ex-ISCA Show Car
John 10:30
Reply With Quote
  #6  
Old 03-31-2017, 02:56 PM
markinnaples markinnaples is offline
Senior Member
 
Join Date: Jan 2006
Location: Naples, FL
Posts: 4,637
Thanks: 21,542
Thanked 1,365 Times in 662 Posts
Default

No suggestions where to start?
__________________
1968 Camaro Ex-ISCA Show Car
John 10:30
Reply With Quote
  #7  
Old 03-31-2017, 03:54 PM
cook_dw cook_dw is offline
Banned
 
Join Date: Oct 2003
Posts: 4,322
Thanks: 623
Thanked 1,487 Times in 609 Posts
Default

Sorry.. Forgot about the thread. I would go with a forged internal 400ci +/- sbc if you are wanting to going with a 6-71. Nothing crazy just a good set of rods & bolts and a set of flat or dish forged pistons. Heads will dictate which piston you will want to go with. You need to figure out what kinda budget you plan on working with and go from there. There are a ton of options out there. You will more than likely have around $5K minimum in just the blower and everything itll need to make it work.
Reply With Quote
  #8  
Old 03-31-2017, 04:00 PM
markinnaples markinnaples is offline
Senior Member
 
Join Date: Jan 2006
Location: Naples, FL
Posts: 4,637
Thanks: 21,542
Thanked 1,365 Times in 662 Posts
Default

Thanks Darrell. I figured it would be pretty expensive. Any reason why a 400-ish instead of a 350? Just curious, thanks again.
__________________
1968 Camaro Ex-ISCA Show Car
John 10:30
Reply With Quote
  #9  
Old 03-31-2017, 04:03 PM
ZAPPER68 ZAPPER68 is offline
Yenko Contributing Member
 
Join Date: Jun 2005
Location: British Columbia,Canada
Posts: 342
Thanks: 824
Thanked 102 Times in 52 Posts
Default

Hi Mark, FWIW I'll give you a brief summary of a sbc I built +25 years ago. The engine was going in my 28 Ford Sedan Delivery and I didn't want the carbs, scoop or air cleaner protruding out of the hood.

Therefore, to achieve this goal I selected a B&M 144 blower which, back then had received good reviews. I started with a seasoned 4 bolt main block, steel crank and GM 'pink' rods. For the camshaft we went with a 'blower cam' and valve train recommended by Comp. IMHO a blower cam is essential for obvious reasons. The forged pistons gave me a CR of around 8.0:1 (I can't remember exactly) and I used traditional GM angle plug heads. A Holley 3310, 750 Vac Sec carb topped it off.

The combination was perfect for the street and with the hood and hood sides installed, none were the wiser. Although we didn't dyno the engine I'm sure it made +/- 350 hp...it started instantly, idled well and would pull like crazy through 5500 rpm with ease. I used a Turbo 350 transmission with a B&M street convertor behind the engine.

Around 15K miles I pulled the blower and sent it to B&M for maintenance. They advised me there was nothing wrong with it but changed the bearings and seals as a precautionary measure for next to nothing. I know most people want the looks (and possibly) whine of a 671 but as indicated above, that was not my goal.

One last thing, I used a Mallory distributor that gave me some 'issues' along the way. If I were to do another blower engine again I would likely use an MSD. As you know, timing is critical and detonation is a killer. I eventually sold the car with around 35K miles on the drive train and other than the Mallory dist. 'issue' the engine ran perfectly.

I hope this helps a little and good luck with your project.
Reply With Quote
  #10  
Old 03-31-2017, 04:28 PM
cook_dw cook_dw is offline
Banned
 
Join Date: Oct 2003
Posts: 4,322
Thanks: 623
Thanked 1,487 Times in 609 Posts
Default

Quote:
Originally Posted by markinnaples View Post
Thanks Darrell. I figured it would be pretty expensive. Any reason why a 400-ish instead of a 350? Just curious, thanks again.

Its personal preference more than anything. Lord knows there are many out there that run a 350ci with the 6-71. Also you will have to underdrive the shit out of the blower by 30% to make the minimum boost of 6psi. And with 6psi your effective compression ratio (with a static compression of 8.0 to 1) will be 11 to 1 give or take. Itll probably be a slight turd down low until you get under boost but you probably wont notice it much on the street. If anything a gear swap in the diff may help. Read through this if you havent already to help understand blowers and how to select the right one for what you want.

http://documents.holley.com/techlibr..._tech_info.pdf
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 12:32 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.

O Garage vBulletin Plugins by Drive Thru Online, Inc.