All Small Six 83 large log exhaust porting

This relates to all small sixes

chad

5K+
VIP
Supporter 2021
Supporter 2020
Supporter 2019
my suggestions? geta nother head if U wanna go further. Use this one 4 awhile. C what U think (3 - 9 mo?). If U wanna go further have the other head done further than this. Slap it on ina day or 3 (depending - U been on here awhile, gettin 'experienced" ! ) But ahma DD so don't want 'dwn time'. Havea buncha heads...
 

bmbm40

1K+
VIP
Supporter 2021
Click here and scroll down to #11 for links to the BBD swap.

 

bmbm40

1K+
VIP
Supporter 2021
Try this link:

 

bmbm40

1K+
VIP
Supporter 2021
Also within this body of information was this description of a large 1v Monojet that sounds interesting:

Post #19 by 63falcon4drwagon » Thu Apr 11, 2019 1:20 pm
Want a 250 cfm carb that will bolt on a large log head?
1968 and 1969 Camaro six-cylinder engines (the standard 230ci/140hp and the optional 250ci/155hp), received the Rochester "Monojet" (1MV) one-barrel carburetors rated at 250 CFM.
1-11/16" throttle bore with 1-1/2" venturi = 250 cfm
$96.99 on Amazon.
It has the same 75mm stud spacing as the Carter YFA which is a bolt on to a 1978 large log Ford carb adapter.

I have seen pics of the Monojet and it looks tall so not sure about getting one mounted and having hood clearance issues.
 

Dr_Dan_WWW

New member
Supporter 2021
I'm trying to figure this out... let's see
You're hogging out the Ford 200 log?
The large log flows at something like 124-146 cfm.
The BBD flows at 250- or 275 cfm depending on carb?
And it fits next to the valve cover?

1634059306189.png
 
Last edited:

Dr_Dan_WWW

New member
Supporter 2021
I read the whole thread on this topic and googled a few carbs mentioned. It's beyond my pay grade. Back to porting.
 
Last edited:

chad

5K+
VIP
Supporter 2021
Supporter 2020
Supporter 2019
Also within this body of information was this description of a large 1v Monojet that sounds interesting:

1968 and 1969 Camaro six-cylinder engines (the standard 230ci/140hp and the optional 250ci/155hp), received the Rochester "Monojet" (1MV) one-barrel
a bronk duz best w/a huge 1v as the i6 has low rev tq. I've done all I can to support that (motor choice, cam, carb, long tube hdrs, gears, etc.) In some of these cases I did not take it further (300/4.9, HUGE RV cam, the RBS is a move but not as helpfull as above carb (s).
I think they (BBD) 'clear the VC" by a sideways mount on the log. It also helps w/the throttle link. Ask Seth
 

wsa111

Distributor Recurving.
Staff member
VIP
Approved Vendor
Supporter 2018
The time to do a direct mount & a center exhaust port divider must be done first thing before doing anything else.
Reason, after preheating head to braze around log for a direct mount & a center exhaust port divider could produce cracks.
After these are done the head should be checked for cracks.
After that then do all the port work & installation of larger valves & resurfacing can be done without doing $$$$ amount on a cracked head.
 
Top