305 swap

[Bamfster]

Re: 305 swap

X2 on Scoggin/Dickey. For what you will pay to rebuild/freshen a used set, you can get new from them.

[truckertom21]

Re: 305 swap

okay cool i just got a desktop dyno from a friend and so i'll be checking it out...its an older version but it should do what i want it to do.

also about the heads how well do they flow? i cant find the numbers so i can put them into the dyno

[Weldangrind]

Re: 305 swap

okay cool i just got a desktop dyno from a friend and so i'll be checking it out...its an older version but it should do what i want it to do.

also about the heads how well do they flow? i cant find the numbers so i can put them into the dyno

I just sent you some thoughts in a PM.

[truckertom21]

Re: 305 swap

okay cool i got them i'll try that

[rightpedal]

Re: 305 swap

I saw the gas mileage talk and had to speak up. Once you get the rig up and running get an air/fuel meter and tune it with that. My Blazer (350 4spd 4wd 4.11 gear 35' tire) was getting 8mpg and we got it up to 9.5 mpg with the meter. Don't laugh that 1.5 makes a huge difference.

Sacrilege coming:::::::: Don't put a big cam in this thing. It just wont help you. The blazer is on its third motor(I have owned it a while) the most recent motor was built to go into a much lighter car and has a bunch of cam (comp mag 525'/248) It was used in a fix. I gotta go wheelin. Its a lot of fun north of 4000 rpm and doesn't do a damn thing south of that.

Question how much could be gained or lost in compression with a really thick head gasket? (400/vortec)

[yellomalibu]

Re: 305 swap

I saw the gas mileage talk and had to speak up. Once you get the rig up and running get an air/fuel meter and tune it with that. My Blazer (350 4spd 4wd 4.11 gear 35' tire) was getting 8mpg and we got it up to 9.5 mpg with the meter. Don't laugh that 1.5 makes a huge difference.

Sacrilege coming:::::::: Don't put a big cam in this thing. It just wont help you. The blazer is on its third motor(I have owned it a while) the most recent motor was built to go into a much lighter car and has a bunch of cam (comp mag 525'/248) It was used in a fix. I gotta go wheelin. Its a lot of fun north of 4000 rpm and doesn't do a damn thing south of that.

Question how much could be gained or lost in compression with a really thick head gasket? (400/vortec)

By using a thick head gasket to lower compression, you're sort of ruining the quench design of the vortec chamber. There are several piston manufacturers that offer a D shaped dish (or inverted dome) that have a flat area for the quench, and a dish deep enough to keep the compression where it should be.

I just googled a bit and found this thread from CHP's web board. Old Bogie is always good for some answers... and I see SmallBlockJay chimed in, as did I... back when I was YelloChevello. heh.

http://forums.chevyhiperformance.com/70/700901/general-chevy-technical-discussion/heads-and-intake/index.html

My comment:
The 30cc D-dish pistons with a .005 deck height and vortec heads will give you about 9:1 compression. You can probably run the cheap gas with that combo.