i had 2 take a 4" cutting blade and cut the mounting tabs off the back of the blinkers. got about a 1/4" clearance dunno if that is enough yet.

Parish- stock y-pipe 2 the turbo- y-pipe and piping covered with exhaust warp. I will eventually get a welder of my own and do a front mount turbo depending on some things.


really $5 bucks or does that mean like $20 for each pipe i need welded? might go 2day 2 get some stuff welded

 

Looks like a good setup. I'm interested to see how the 4.3 likes boost.

 

supposedly they love it. @ 11psi machperformance made 360whp which is 210 to 220 more whp than a stock blazer - i will be running the machperformance fuel set-up, with AEM wideband 2 keep track of everything, and some methanol 2 hit 13psi - 400whp is the goal

 

That is a very, very nice setup you have there.

Just a couple things, I noticed that you stayed with the 4.3L 75mm MAFS, in case you didnt know, the V8's from 4.8 up to the 8.1's use the newer plastic 85mm MAFS thats was used in the 385 hp 2001 ZO6 and 2004 405 hp ZO6 LS6 Corvettes.

Also how are you getting around the 19 lb/hr upgraded MPFI spider injectors?? Are you using a converted can intake marine intake or an extra injector setup with a boost referenced fuel managament system?? Usually the 19 lb/hr injectors keep NA power under 300 IIRC on the 4.3 V6's.
On my 1997 Vortec 350 which uses the same sized injectors but slightly different design, I am using a GM/Mercruiser MArine Intake manifold with 24 lb/hr injectors that flow around 28.4 lb/hr at the Vortecs 60 psi fuel pressure. I got a used MArine intake and injectors for $750US and did the complete install for around $975 including tuning.
Using 6 large injectors is much better than using the 6 stock injectors with 2 supplemental injectors due to the uneven cylinder to cylinder fuel distribution which is esp/ critical on a boosted engine like yours.

here is a link to a parts list of the GM/Mercrusier Marine V6 intake manifold.
http://www.mercruiserparts.com/Show_...+AND+FUEL+RAIL

Last summer I was involved in the Vortec V8 marine intake conversion project over on the PPE(Pacific Performance Engineering)Truck Performance board http://www.pacificp.com/forum/index.php and was the 2nd person in N. America to get 1 up and running on a stock PCM controlled truck.
James B has his running with a Whipple charger on it and he reports substantial gains with his marine intake. There are a few more that have beem installed and all are happy.
You will probably lose a little boost but since boost is just a measure of resistance and NOT power production, your power will actually increase.

The marine intake uses an iron lower plenum and an aluminum upper plenum. The iron lower helps to partially reduce some of the problems of the Vortec intake manifold sealing problems as iron intake on iron cylinder heads reduce the amount of shear stress that occurs as the engine warms up. the stock intake uses aluminum intake on iron heads and bothmetals expand at different rates which can cause leaks.

You can see exactly how flat the floor of the intake manifold is. If you have seen the inside of the V6 and V8 Vortec 4.3/5.0 and 5.7L GEN 1E engines you will have noticed exactly how bad their airflow is due to the horribly uneven lenum floor and with the fuel pressure regulator, injectors and feed hoses directly in the airflow of the intake manifold.
Plenum volume is MUCH larger with the marine intakes. With teh marine intakes you can use ANY high impedance injector with the stock PCM so long as you change the IFR(Injector Flow Rating) in the PCM.
The marine intake alows you to use all the stock serpentine accessories, stock air intake componments, stock throttle cables, stock cruise control and if painted black looks very similar to a stock intake which is good for the visual part of an emissions test.(may not be important in your application)

Here are some pics of the V8 marine intakes, the V6 marine intakes are exactly the sameas the V8's. You can actually see all the CRAP that is inside the stock intake manifolds that will restrict flow.

this is a marine intake as it comes from GM http://www.sfatek.com/images/efi.jpg

This post has a few pics of interest. There is a side by side of a V8 stock truck intake and a marine intake. Also there is a pic of the old stock spider injection setup and the updated MPFI GM conversion spider(spider with thicker fuel feed hoses). On teh upgraded spider, you can see the injectors are actually at the end of the hoses instead of at the beginning of them. In 2000 or 2001 GM began installing the upgraded spiders at the factory in the vortec 4.3's amd in the few Vortec 305's and 350's that were used up to 2003 in the fullsize vans. You 4.3 should allreadt have the upgraded injection spider installed. If you lived in California, GM actually paid for the retrofitting of teh conversion in all 1996 and up 350 and 305 engines under warranty as Cali gas caused the old spider to clog. You can buy these upgraded spiders thatcome with a new FPR for under $300 with 8 injectors, some have got them for as low as $160US.
https://www.performancetrucks.net/fo...d.php?t=356743

This link has a pic of the kit you get if you buy the upgraded spider setup(scroll down)
http://www.pacificp.com/forum/viewtopic.php?t=981

This link has a bunch of pics of the crowded insides of the stock Vortec 4.3, 305 and 350 intake manifolds.
http://www.pacific-audio.com/perform...es/231640.html

I have also seen a RAmjet aluminum V8 intake that was cut apart then rewelded together to make it work on a V6. HWile looking funny I assume it would have worked well.


That V6 should really turn on.

Keep us posted.

peace
Hog

 

yes i am really interested in the marine intake manifold swap. but it just looks a little daughnting. gotta make custom injector harness. and some other misc ****. @ least that is what i have been told although you sound like your alot more educated on the swap than anyone i have ever talked 2 so what is your agenda on it. having a hard time finding manifold and fuel rails together most of the time its either one or the other

 

did some work last night. harder AND HOTTER THAN EXPECTED (so ******* hot outside)

 

if the cops rolled up and saw your blazer they'd probably think you were stripping it. And that your radiator looks kinda small. Anyways nice work. How much boost can the stock 4.3 liter take?