[fluidvp]

Im presently trying to throw together a rat rod that'll lay lots of rubber, and hopefully stand the tires up a foot or so. What i have so far is a 68 thunderjet that runs(doesn't smoke) but seems tired, and an old gmc roots blower, also a decent C6. I have a few questions to ask the more knowledgeable BBF guru's:

1. I am aware thar i will need to fab plates for the intake and carb sides of the 871, but where do i get an intake for it?

2. I believe the 429 is running 10.5.1 compression, but being that its tired, can i get away with just tossing the blower on and not bother trying to drop the cylindar head compression with copper gaskets?

3. Where do i find a set of lakes pipes for this thing?


Thanks in advance.

 

[Charlie Stevens]

Well, for a "Rat Rod", you can make a blower intake like we used to, use a tunnel ram base with a plate on it. At 10.5 to 1, stock rods and pistons, you are going to have to underdrive the blower 30-40% AND even then, the pistons and rods will probably end up in the pan. As for lakes pipes, find a header builder or DIY. Seriously, even though you want it to look ratty, on the outside, it needs to be well built inside. I'd get a pair of D3 heads, put S/S valves and springs/retainers to match the cam of choice, clean out the dingle berrys in the ports & chambers, invest in a good set of rods and pistons. put it together right and go SMOKE'M.

 

[DaveMcLain]

BDS sells the Blue Thunder

BDS sells the Blue Thunder blower intake and it's a very nice piece. It puts the blower up pretty high so that the snout can pass over the top of the distributor.

While it's possible to just bolt the blower onto the stock engine I think it would be a lot better if you would build a low compression engine for this application. It could be cheap and "ratty" too. A set of D3's and or 460 pistons and the 429 crank would certainly get you down there where you need to be because it's always much better to be lower compression and able to run more blower rather than the other way around.

 

[Falcon67]

Another FYI - BDS does not recommend using a stock GMC unit in any fashion. They are not built stock to turn any of the RPM it will see on a car. You'd have to underdrive it at least 40% to keep the bearings alive and that might be iffy then.

 

[rmcomprandy]

8-71; 10-71; 12-71 were all aftermarket made...

GMC never made an 8-71; only an 8-149 which had angled hold down bolts. The 8-71 is somebodies aftermarket case derived from the GMC rotor length in the 8-149.

 

[DaveMcLain]

This is true

That's correct Randy, there was never an 871, only an 8V71 engine. The 671 blower with the straight bolts case comes from the inline 6 cylinder Detroit Diesel, there was never an inline 8 cylinder Detroit Diesel....