1SlowHoe

iTrader: (28)

I think my 6L is getting a little worn (compression test soon). I am looking at a used 408 (less than 1000 miles). I just want to swap short blocks and call it a day.

408 has -3cc forged pistons and a 231/239 617/624 lift 113+4 cam. I will use stock 317 heads and gaskets. So you math wizards can calulate the compression ratio for me
So will my little 112 from yester-year feed this thing at all with the cam listed above?
If it makes 6psi I will be happy. I'm making 8-9 right now with a 2.8" pulley on my GT2-3 cammed 6L.

I want more Tq than HP. I mostly use the Tahoe to pull around my 3500lb boat than race these days. I do however flog on it daily on my 3 mile communte to work. MPG is not a concern for me...

silver-mod-o

iTrader: (15)

Unless you go to an overdrive crank pulley, you're not going to see more than 4 or so psi. And even then it's going to be so far out of it's efficiency range it's going to be the source of as much global warming as it is horsepower...

dhpro

iTrader: (3)

So...I'm no expert but I think that 112 will be a little overwhelmed. I'd be really interested to know if higher compression would help it though? Maybe 11:1...maybe Joe from Leftcoast or Brian can offer us some help...

AndysC3

iTrader: (14)

With the stock heads and gaskets, you will be at about 10.2:1. Maybe mill the heads alittle and bring it to about 10.7:1

old motorhead

iTrader: (10)

Put the GT2-3 cam in it and maybe a 3.0 pulley and you'll be good to go. Won't make a huge amount of boost, but it will tow anything you can back up to.

FarmTruc

iTrader: (5)

we pulled a 112 off an ssr with a high compression 408 with stock heads and healthy cam.
made 3psi with smallest charger pulley and biggest crank pulley.
pulled the charger off, put a good cam in and it runs stronger.

slowec

iTrader: (9)

Time to sell the global warmer. LOL

1SlowHoe

iTrader: (28)

As I suspected. So is a M122 head unit an easy swap for the old 112? I understand it may need a few little things but overall is it a basic conversion?
I think a TVS will be more work and more $$ and before anyone asks, I'm not wanting to go turbo.

I wouldn’t have a problem milling heads to raise compression for either blower.

Holty

iTrader: (6)

I doubt you will see a gain worth anything going from the 112 to the 122. Maybe 2-3psi tops.

1SlowHoe

iTrader: (28)

Ya I just got off the phone w/Blownchevy and he said the same. Quoted me on a 2300. Now I need to decide if I want to go N/A or blow this engine...